Makoto Morinaga
| Institute for Laser Science | Associate Professor |
| Department of Engineering Science | Associate Professor |
| Cluster III (Fundamental Science and Engineering) | Associate Professor |
Researcher Information
Educational Background
Research Activity Information
Paper
- Coherent interaction of orthogonal polarization modes in a photonic crystal nanofiber cavity
Jameesh Keloth; Kali P Nayak; Jie Wang; Makoto Morinaga; Kohzo Hakuta
Optics express, 27, 1453-1466, 21 Jan. 2019, Peer-reviwed
Scientific journal, English - 3Dプリンタで作る2次元電動ステージ
森永実
分光研究, 日本分光学会, 67, 200-201, Nov. 2018, Peer-reviwed, Invited
Scientific journal, Japanese - Two-mode interference in a photonic crystal nanofiber cavity
J. Keloth; K. P. Nayak; J. Wang; M. Morinaga; K. Hakuta
European Optical Society Biennial Meeting, 1, 2018
International conference proceedings, English - Photon field in the presence of a nanofiber
Makoto Morinaga; Ramachandrarao Yalla; Kohzo Hakuta
Japanese Journal of Applied Physics, Institute of Physics Publishing, 54, 7, 072001-1-072001-6, 10 Jun. 2015, Peer-reviwed, The presence of a nanofiber modifies the photon field near the nanofiber. The emission of photons into a certain direction can be enhanced by placing a nanofiber near the photon emitter. We discuss the modification of the photon field by the presence of a nanofiber and evaluate the effect of emission enhancement for a realistic experimental scheme.
Scientific journal, English - Wave propagation through a set of slits
Makoto Morinaga
OPTICAL REVIEW, OPTICAL SOC JAPAN, 22, 1, 33-38, Feb. 2015, Peer-reviwed, Propagation of a wave through a set of identical slits is investigated using a scalar diffraction theory. The slits are aligned on a straight line with equal spacing. The asymptotic expansion of the matrix elements of the propagation operator is derived and compared with numerical calculations. And then the eigenmodes and eigen-values of the propagation operator are estimated. Our analysis should provide an insight into the properties of waveguides composed of opaque masks that have been proposed recently.
Scientific journal, English - Guiding of light with pinholes
Makoto Morinaga
Int. J. Phys. Sci., 9, 20, 444-453, 30 Oct. 2014, Peer-reviwed
Scientific journal, English - Efficient Channeling of Single Photons into Single Mode Optical Fiber
R. R. Yalla; Fam Le Kien; M. Morinaga; K. Hakuta
CLEO QELS, QELS-2013-QF2A.3, 2013
International conference proceedings, English - Efficient Channeling of Fluorescence Photons from Single Quantum Dots into Guided Modes of Optical Nanofiber
Ramachandrarao Yalla; Fam Le Kien; M. Morinaga; K. Hakuta
PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, 109, 6, 063602, Aug. 2012, Peer-reviwed, We experimentally demonstrate the efficient channeling of fluorescence photons from single q dots on optical nanofiber into the guided modes by measuring the photon-count rates through the guided and radiation modes simultaneously. We obtain the maximum channeling efficiency to be 22.0(+/- 4.8)% at a fiber diameter of 350 nm for the emission wavelength of 780 nm. The results may open new possibilities in quantum information technologies for generating single photons into single-mode optical fibers.
Scientific journal, English - Guiding of Waves between Absorbing Walls
Dmitrii Kouznetsov; Makoto Morinaga
Journal of Modern Physics, 3, 7, 553-560, Jul. 2012, Peer-reviwed
Scientific journal, English - Manipulation of transverse mode of a beam by an array of opaque masks
Makoto Morinaga
電気学会光・量子デバイス研究会資料, OQD-10, 46-54, 15-18, Dec. 2010
Scientific journal, Japanese - Measurement of fluorescence emission spectrum of few strongly driven atoms using an optical nanofiber
Manoj Das; A. Shirasaki; K. P. Nayak; M. Morinaga; Fam Le Kien; K. Hakuta
OPTICS EXPRESS, OPTICAL SOC AMER, 18, 16, 17154-17164, Aug. 2010, Peer-reviwed, We show that the fluorescence emission spectrum of few atoms can be measured by using an optical nanofiber combined with the optical heterodyne and photon correlation spectroscopy. The observed fluorescence spectrum of the atoms near the nanofiber shows negligible effects of the atom-surface interaction and agrees well with the Mollow triplet spectrum of free-space atoms at high excitation intensity. (C) 2010 Optical Society of America
Scientific journal, English - Planar Electric Trap for Neutral Particles
Makoto Morinaga; Tetsuo Kishimoto
JAPANESE JOURNAL OF APPLIED PHYSICS, JAPAN SOC APPLIED PHYSICS, 48, 9, 096505, Sep. 2009, Peer-reviwed, A new geometry to trap neutral particles with an ac electric field using a simple electrode structure is described. In this geometry, all electrodes are placed on a single chip plane, while particles are levitated above the chip. This enables easy construction of the trap and good optical access to the trap. (C) 2009 The Japan Society of Applied Physics
Scientific journal, English - Antibunching and bunching of photons in resonance fluorescence from a few atoms into guided modes of an optical nanofiber
K. P. Nayak; Fam Le Kien; M. Morinaga; K. Hakuta
Phys. Rev. A, 79, 021801(R), Feb. 2009, Peer-reviwed
Scientific journal, English - Circular Magneto-Optical Trap for Neutral Atoms
M. Morinaga
J. Phys. Soc. Jpn., THE PHYSICAL SOCIETY OF JAPAN, 77, 10, 104402-1-3-104402, Sep. 2008, Peer-reviwed, We propose and experimentally demonstrate a novel scheme to magneto-optically trap neutral atoms in a ring shaped trap which could be used for efficient loading of atoms into a circular magnetic trap. Two sets of anti-Helmholz coils having a common center and oriented coaxially are used to generate a circle of zero magnetic field. Six laser beams of proper frequency and polarization then trap atoms onto this circle.
Scientific journal, English - Efficient Probing Of Few Atom Fluorescence through the Guided Mode of an Optical Nanofiber
K. P. Nayak; P. N. Melentiev; M. Morinaga; Fam Le Kien; V. I. Balykin; K. Hakuta
CLEO/Pacific Rim 2007, 1, Aug. 2007, Peer-reviwed
International conference proceedings, English - Optical nanofiber for manipulating and probing single atom fluorescence
K. P. Nayak; P. N. Melentiev; M. Morinaga; Fam Le Kien; V. I. Balykin; K. Hakuta
IQEC 2007 (Munich, Germany), 1, Jun. 2007, Peer-reviwed
International conference proceedings, English - Optical nanofiber as an efficient tool for manipulating and probing atomic fluorescence
K. P. Nayak; P. N. Melentiev; M. Morinaga; Fam Le Kien; V. I. Balykin; K. Hakuta
OPTICS EXPRESS, OPTICAL SOC AMER, 15, 9, 5431-5438, Apr. 2007, Peer-reviwed, We experimentally demonstrate efficient coupling of atomic fluorescence to the guided mode of a subwavelength-diameter silica fiber, an optical nanofiber. We show that fluorescence of a very small number of atoms, around the nanofiber can be readily observed through a single-mode optical fiber. We also show that such a technique enables us to probe the van der Waals interaction between atoms and surface with high precision by observing the fluorescence excitation spectrum through the nanofiber. (C) 2007 Optical Society of America.
Scientific journal, English - Single Atom as a Light Coupler for a Nanofiber
K. P. Nayak; S. Inoue; M. Morinaga; V. I. Balykin; Fam Le Kien; K. Hakuta
Quantum Electronics and Laser Science Conference (QELS2006), 1, May 2006, Peer-reviwed
International conference proceedings, English - Atom Trap and Waveguide Using a Two-Color Evanescent Field Around a Subwavelength-Diameter Optical Fiber
Fam Le Kien; V. I. Balykin; J. Q. Liang; M. Morinaga; K. Hakuta
The Ninth Asia Pacific Physics Conference, Oct. 2004
International conference proceedings, English - Focusing ground-state atoms with an electrostatic field
M Morinaga
APPLIED PHYSICS B-LASERS AND OPTICS, SPRINGER, 79, 6, 679-682, Oct. 2004, Peer-reviwed, A general formula for the trajectory of atoms in an arbitrary potential with axial symmetry is derived. We apply this formula to show that an axially symmetric electrostatic imaging lens for ground-state neutral atoms is possible. Because of its simple construction and capability of focusing atoms of any species, such a lens system can be used in a variety of applications.
Scientific journal, English - Atom trapping and guiding with a subwavelength-diameter optical fiber
Balykin, VI; K Hakuta; F Le Kien; JQ Liang; M Morinaga
PHYSICAL REVIEW A, AMERICAN PHYSICAL SOC, 70, 1, 011401, Jul. 2004, Peer-reviwed, We suggest using an evanescent wave around a thin fiber to trap atoms. We show that the gradient force of a red-detuned evanescent-wave field in the fundamental mode of a silica fiber can balance the centrifugal force when the fiber diameter is about two times smaller than the wavelength of the light and the component of the angular momentum of the atoms along the fiber axis is in an appropriate range. As an example, the system should be realizable for cesium atoms at a temperature of less than 0.29 mK using a silica fiber with a radius of 0.2 mum and a 1.3-mum-wavelength light with a power of about 27 mW.
Scientific journal, English - One-dimensional focusing of an atomic beam by a flat reflector
H Oberst; M Morinaga; F Shimizu; K Shimizu
APPLIED PHYSICS B-LASERS AND OPTICS, SPRINGER, 76, 8, 801-803, Jul. 2003, One-dimensional focusing of an atomic beam from a flat reflector is experimentally demonstrated. Focusing occurs because gravity changes the momentum transfer perpendicular to the surface depending on the height of the reflecting point. Theoretical analysis shows that, for a certain parametric range, diffraction-limited focusing of an atomic beam is possible.
Scientific journal, English - Cesium gas strongly confined in one dimension: Sideband cooling and collisional properties
Bouchoule, I; M Morinaga; C Salomon; DS Petrov
PHYSICAL REVIEW A, AMERICAN PHYSICAL SOC, 65, 3, 033402, Mar. 2002, Peer-reviwed, We study one-dimensional (1D) sideband cooling of cesium atoms strongly confined in a far-detuned optical lattice. The Lamb-Dicke regime is achieved in the lattice direction whereas the transverse confinement is much weaker. The employed sideband cooling method, first studied by Vuletic et al., uses Raman transitions between Zeeman levels and produces a spin-polarized sample. We present a detailed study of this cooling method and investigate the role of elastic collisions in the system. We accumulate 83(5)% of the atoms in the vibrational ground state of the strongly confined motion, and elastic collisions cool the transverse motion to a temperature of 2.8 muK=0.7 (h) over bar omega(osc)/k(B), where omega(osc) is the oscillation frequency in the strongly confined direction. The sample then approaches the regime of a quasi-2D cold gas. We analyze the limits of this cooling method and propose a dynamical change of the trapping potential as a mean of cooling the atomic sample to still lower temperatures. Measurements of the rate of thermalization between the weakly and strongly confined degrees of freedom are compatible with the zero-energy scattering resonance observed previously in weak 3D traps. For the explored temperature range the measurements agree with recent calculations of quasi-2D collisions. Transparent analytical models reproduce the expected behavior for k(B)T>>(h) over bar omega(osc) and also for k(B)T<<(h) over bar omega(osc) where the 2D features are prominent.
Scientific journal, English - リチウム磁気トラップの蒸発冷却
河野託也; 清水和子; 清水富士夫
日本物理学会2001年秋季大会, 2001
Japanese - Manipulation of Quantum States of Neutral Atoms
M. Morinaga
2nd Workshop on Laser Cooling, Hayama, JAPAN, Feb. 2000
Japanese - Atom Holography
Fujio Shimizu
Advances in Atomic, Molecular and Optical Physics, 42, C, 73-93, 2000
Scientific journal, English - Manipulation of motional quantum states of neutral atoms
M Morinaga; Bouchoule, I; JC Karam; C Salomon
PHYSICAL REVIEW LETTERS, AMERICAN PHYSICAL SOC, 83, 20, 4037-4040, Nov. 1999, Peer-reviwed, Cold Cs atoms are cooled into the ground state (n = 0) of a far detuned 1D optical lattice. From this state, we prepare and detect several quantum states of motion. First, we produce squeezed states of n = 0 (and n = 1) and record the time evolution of the velocity distribution of these states. A velocity distribution compressed by a factor of 4 compared to that of the ground state is obtained. Second, we prepare a linear superposition of n = 0 and n = 1 and observe its time evolution.
Scientific journal, English - Atom interferometers and atom holography
F Shimizu; J Fujita; M Morinaga; T Kishimoto; S Mitake
ATOMIC PHYSICS 16, AMER INST PHYSICS, 477, 223-233, 1999, Various techniques of atom manipulation with a binary hologram are discussed and demonstrated experimentally. An atomic beam of metastable neon in the 1s(3) state and a SiN thin film with holes that expresses the transmission function of the hologram are used to demonstrate this technique. The gray-scale holography of atoms is demonstrated for the first time. Other possibilities of holographic manipulation of atoms are also discussed.
International conference proceedings, English - Neutral atoms prepared in Fock states of a one-dimensional harmonic potential
Bouchoule, I; H Perrin; A Kuhn; M Morinaga; C Salomon
PHYSICAL REVIEW A, AMERICAN PHYSICAL SOC, 59, 1, R8-R11, Jan. 1999, Peer-reviwed, We describe the preparation of Fock states of motion of cesium atoms trapped in potential wells of a far detuned optical lattice. Direct observation of the velocity distribution of the \n =o] and \n=1] Fock states is obtained by an absorption imaging technique. [S1050-2947(99)50701-4].
Scientific journal, English - Atomic beam holography for nanofabrication
J Fujita; T Kisimoto; M Morinaga; S Matsui; F Shimizu
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, AMER INST PHYSICS, 16, 6, 3855-3858, Nov. 1998, Peer-reviwed, Atomic beam holography is a unique technique by which to fabricate a nanoscale object by using the interference of matter waves of ultracold atoms. The atomic de Broglie wave coming through a hologram interferes with and reconstructs a desired structure on a substrate. We first demonstrated holographic manipulation of metastable Ne atoms of 7 nm wavelength, where we showed the reconstruction of an "F" pattern and improvement of it. In this article, we propose and show techniques to manipulate three-dimensionally cooled Ne atoms. Atomic beam holography has the potential to make atomic-size objects, and the freedom in designing the hologram enables us to make not only a binary pattern but also an analog (gray scale) pattern. The resolution demonstrated in this experiment was about 60 mu, but the minimum feature size expected is theoretically the same as the wavelength, i.e., several nanometers. (C) 1998 American Vacuum Society. [S0734-211X(98)17606-0].
Scientific journal, English - 原子線ホログラフィ
藤田淳一; 森永実; 清水富士夫
光学, 27, 268, 1998, Peer-reviwed
Scientific journal, Japanese - 原子線ホログラフィ
藤田淳一; 森永実; 岸本哲夫; 安田正美; 松井真二; 清水富士夫
光技術コンタクト, 日本オプトメカトロニクス協会, 35, 2, 107-113, 1997, Peer-reviwed
Scientific journal, Japanese - Holographic manipulation of a cold atomic beam
M Morinaga; M Yasuda; T Kishimoto; F Shimizu
PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, 77, 5, 802-805, Jul. 1996, Peer-reviwed, A method of generating an arbitrary pattern of atoms by using an interferometric technique is reported. A laser-cooled metastable Ne atomic beam in the 1s(3) state is diffracted by a computer generated binary hologram. A black-and-white pattern is drawn on a microchannel detector with a spatial resolution exceeding 65 mu m and a resolving power better than 30.
Scientific journal, English - Manipulation of an atomic beam by a computer-generated hologram
J Fujita; M Morinaga; T Kishimoto; M Yasuda; S Matsui; F Shimizu
NATURE, MACMILLAN MAGAZINES LTD, 380, 6576, 691-694, Apr. 1996, Peer-reviwed, TECHNIQUES for manipulating neutral atoms are valuable tools for the investigation of surfaces, acid hold promise for the fabrication of atomic structures for technological applications. The ability to position individual atoms with the accuracy of a crystal lattice constant has been demonstrated(1) using the scanning tunnelling microscope (STM). On the other hand, manipulation with lasers offers a means of controlling atoms in bulk, although it lacks the positional accuracy of the STM. The ability to generate ultra-cold atoms(2-5) using lasers has opened new possibilities: because of their long de Broglie wavelengths, cold atoms are amenable to interferometric manipulation, such as deflection by a grating(6,7) and focusing by a Fresnel lens(8). Here we demonstrate a potentially more flexible approach to atomic manipulation based on holographic principles. We pass a beam of ultra-cold metastable neon atoms through a computer-generated hologram that encodes the Fourier transform of a desired atomic pattern. Diffraction of the atomic beam by the hologram then reconstructs the pattern, in a manner analogous to optical holography. This approach should in principle enable the imposition of arbitrary intensity and phase information onto an atomic beam.
Scientific journal, English - 原子線ホログラフィー
森永実; 藤田淳一; 松井真二; 清水富士夫
応用物理, 65, 9, 912-918, 1996, Peer-reviwed
Scientific journal, Japanese - ELECTRIC TRAPPING OF NEUTRAL ATOMS - STABILITY THEORY
M MORINAGA; F SHIMIZU
LASER PHYSICS, INTERPERIODICA, 4, 2, 412-415, Mar. 1994, The possibility to trap neutral atoms by an ac electric field using the second-order Stark effect is discussed. Criterion for the stability of ac electric trapping is theoretically investigated. The stable region is numerically determined for a configuration of six electrodes with sinusoidal and rectangular electric fields. The result shows the universal stability when [force]/[frequency]2 is small. The effective potential depth is also calculated.
Scientific journal, English - ELECTRIC TRAPPING OF NEUTRAL ATOMS
F SHIMIZU; M MORINAGA
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, JAPAN SOC APPLIED PHYSICS, 31, 12A, L1721-L1723, Dec. 1992, Two- and three-dimensional trappings of neutral atoms by an electric field are discussed. It is shown that a harmonic potential produced by the second-order Stark effect around a saddle point of the electric field intensity can be used to trap laser-cooled neutral atoms.
Scientific journal, English - OBSERVATION OF THE CA 4S1S0-4P3P1 TRANSITION IN CONTINUOUS FREE-FALLING COLD ATOMIC FLOW FROM AN ATOM TRAP
T KUROSU; M MORINAGA; F SHIMIZU
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, JAPAN J APPLIED PHYSICS, 31, 3A, L273-L275, Mar. 1992, Peer-reviwed, The 4s1S0 - 4p3P1 spectrum of Ca is observed using cold atoms continuously falling from a magneto-optical trap. The 4s1S0 - 4p3P1 and 4s1S0 - 4p1P1 transitions are alternately excited at a point 8 cm below the trap. From the depletion of the blue fluorescence in the 1S0 - 1P1 transition, the absorption signal of the 1S0 - 3P1 line is obtained.
Scientific journal, English
MISC
- 冷却原子と相関計測
森永 実
2011, 素粒子論研究, 118, D187-196, Japanese, Introduction other - 原子波光源としてのレーザ冷却技術
森永実
Mar. 2006, 光技術動向調査報告書, 389-392, Japanese, Introduction other - Atom spinning around an optical fiber: Bound states and guiding
V. I. Balykin; V. I. Balykin; Fam Le Kien; J. Q. Liang; M. Morinaga; K. Hakuta
We propose and examine a scheme to bind atoms in stable orbits around a very thin optical fiber with a propagating fundamental light mode. Our main conclusion is that the neutral atoms can be trapped in two dimensions around the photon-carrying fiber at a submicron distance from the fiber surface. © 2003 Optical Society of America., 01 Jan. 2004, OSA Trends in Optics and Photonics Series, 97, 275-276, 1094-5695, 33645299835
Books and other publications
Lectures, oral presentations, etc.
- 微小発光体と結合させるためのテーパードファイバーチップの作製と評価
相馬康人; 森永実
Oral presentation, Japanese, レーザー学会学術講演会第43回年次大会
20 Jan. 2023 - 微小発光体と結合するテーパー状光ファイバーチップの試作
森永実; 齊藤樹征; 相馬康人
Oral presentation, Japanese, 日本物理学会第77年次大会, Domestic conference
17 Mar. 2022 - 微小発光体と結合する光ファイバーチップの最適形状とその製作
森永実; 相馬康人; 齊藤樹征
Oral presentation, Japanese, 日本物理学会第76年次大会, Domestic conference
14 Apr. 2021 - 単一発光体と結合したテーパー状光ファイバーの作製と評価
大草聖也; 森永実
Oral presentation, Japanese, 日本物理学会, Domestic conference
16 Mar. 2020 - CAVITY QUANTUM OPTICS BASED ON OPTICAL NANOFIBERS
Makoto Morinaga; J. Keloth; K.M. Shafi; R.R. Yalla; K.P. Nayak; J. Wang; Kohzo Hakuta
Invited oral presentation, English, THE 10th INTERNATIONAL CONFERENCE ON PHOTONICS & APPLICATIONS (ICPA-10), Invited, Institute of Physics, Vietnam Academy of Science and Technology, Vietnam Physical Society, Ha Long City, Vietnam, https://www.iop.vast.ac.vn/activities/HNQHQP_ICPA/10/index.html, International conference
12 Nov. 2018 - Two-mode interference in a photonic crystal nanofiber cavity
Keloth, Jameesh; Nayak, Kali Prasanna; Wang, Jie; Morinaga, Makoto; Hakuta, Kohzo
Oral presentation, English, European Optical Society Biennial Meeting (EOSAM) 2018, International conference
09 Oct. 2018 - Guiding of Wave with Opaque Masks
Makoto Morinaga
Oral presentation, English, 3rd International Conference on Microwave and Photonics (ICMAP 2018) IEEE Xplore DOI: 10.1109/ICMAP.2018.8354631, International conference
09 Feb. 2018 - Single Quantum Dots on an Optical Nanofiber at Cryogenic Temperature
K. M. Shafi; W. Luo; R. R. Yalla; M. Morinaga; K. Hakuta; K. Iida; E. Tsutsumi; A. Miyanaga
Oral presentation, English, The Irago Conference 2017, International conference
02 Nov. 2017 - ピンホール列による光のガイド IV
森永実
Oral presentation, Japanese, 日本物理学会講演概要集,2016年秋季大会, Domestic conference
Sep. 2016 - ピンホール列による光のガイド III
森永実
Oral presentation, Japanese, 日本物理学会講演概要集,2014年秋季大会, Domestic conference
Sep. 2014 - ピンホール列による光のガイド II
森永実; 藤井隆太朗
Oral presentation, Japanese, 日本物理学会講演概要集,第69回年次大会, Domestic conference
Mar. 2014 - Efficient channeling of single photons into single mode optical fiber
Ramachandrarao Yalla; Fam Le Kien; M. Morinaga; K. Hakuta
Oral presentation, English, CLEO2013 IEEE Xplore DOI:10.1364/CLEO_QELS.2013.Q, International conference
10 Jul. 2013 - ピンホール列による光のガイド
森永実
Oral presentation, Japanese, 日本物理学会,第68回年次大会
Mar. 2013 - Planar Chip for Electric Levitation of Neutral Particles
Makoto Morinaga
Public symposium, English, ICOLS2009, ICOLS2009, Kussharo
Jul. 2009 - 平面電極構造による中性粒子のＡＣ電場トラップ
森永実; 岸本哲夫
Oral presentation, Japanese, 日本物理学会講演概要集,日本物理学会
Mar. 2009 - Coherent reflection of slow metastable rare gas atoms from a solid surface
M. Morinaga
Invited oral presentation, English, Workshop on Quantum Reflection, ITAMP, Cambridge, MA, USA, International conference
Oct. 2007 - Optical Nanofiber as an Efficient Tool for Exploring Atom-Surface Interaction : Towards Manipulation of Atoms and Photons using Optical Nanofibers
Kali Nayak; Manoj Das; M. Morinaga; V. I. Balykin; Fam Le Kien; K. Hakuta
Oral presentation, Japanese, 日本物理学会講演概要集
Sep. 2006 - リング型磁気光学トラップIII
森永実
Oral presentation, Japanese, 日本物理学会講演概要集
Mar. 2006 - ナノファイバーによる原子と光の操作
K.P. Nayak; 井上卓; 森永実; V.I. Balykin; 白田耕藏
Oral presentation, Japanese, 日本物理学会講演概要集
Mar. 2006 - サブミクロン光ファイバーによる自然放出の制御
Fam Le Kien; Kali Nayak; S; Dutta Gupta; 森永実; 白田耕藏
Oral presentation, Japanese, 日本物理学会講演概要集
Sep. 2005 - Circular magneto-optical trap for neutral atoms
M. Morinaga
Public symposium, English, ESF Research Conference on Bose-Einstein Condensation, ESF, Sant Feliu de Guixols (Costa Brava), Spain
Sep. 2005 - リング型磁気光学トラップII
前田知里; 清水和子; 森永実
Oral presentation, Japanese, 日本物理学会講演概要集
Mar. 2005 - リング型磁気光学トラップ
森永実
Oral presentation, Japanese, 日本物理学会講演概要集
Sep. 2004 - 直径が波長以下の光ファイバーの応用：近接場による原子トラップ
梁佳旗; 井上卓; Fam Le Kien; V. I. Balykin; 白田耕蔵; 森永実
Oral presentation, Japanese, 日本物理学会講演概要集
Sep. 2004 - Control of Quantum States of Atoms in a Dipole Trap
M. Morinaga
Others, Japanese, Seminar on Atomic Physics, NIST, Gaithersburg, MD, U.S.A.
Dec. 1999 - Manipulation of Quantum States of Neutral Atoms
M. Morinaga
Public symposium, English, Cooperative Effects on Photo-Controlled Systems; ERATO WORKSHOP, ERATO, Tucson, Arizona, U.S.A
Nov. 1999
Courses
Research Themes
- テーパー状光ファイバーチップを用いた単一光子源の開発
01 Apr. 2020 - 31 Mar. 2023 - Wave guiding with pinholes
Makoto Morinaga
Principal investigator
21 Oct. 2015 - 31 Mar. 2018 - Manipulation and Control of Atoms Using Nanofiber Evanescent Field
HAKUTA Kohzo; FAMLE Kien; MORINAGA Makoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (B), 光波長の約1/2の直径の極細光ファイバー(ナノ光ファイバー)により原子と光子を操作する方法について実験及び理論の両面から研究を行った。原子としてレーザー冷却したセシウム原子を用い、ナノ光ファイバーにより原子の自然放出は操作・制御できることを実証した。自然放出光は自由空間と大きく異なり、ファイバーの伝播モードへ効率良く放出される。また、単一から少数個の原子の量子光学的振舞いを光子相関計測により系統的に研究した。更に、原子表面相互作用の高精度計測にも道を拓いた。, 18340119
2006 - 2008 - Investigation of the quantum reflection of atoms on a solid state surface
SHIMIZU Kazuko; TAKEDA Mitsuo; MORINAGA Makoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, University of Electro-Communications, Grant-in-Aid for Scientific Research (B), We studied the quantum reflection of the metastable helium atoms on a flat polished silicon surface. We measured the reflectivity as a function of the normal incident velocity component between 3 and 30 cm/s, and confirm that on a flat surface the reflection of atoms is caused by the attractive van der Waals potential. In our case the atoms are mainly reflected in a region where the retardation effect leads to a potential of the approximate form, U(z)=-C_4/z^4 where z is the distance from the surface. We also studied the reflection and diffraction on surface structures consisting of parallel narrow ridges. The structure consists of wall-like ridges at a distance of L=5μm and with a width at the top of l=100nm. We observed on this structure an increase of the reflectivity by two orders of magnitude, exceeding 10% for normal incident velocities below about 25cm/s. At grazing incidence even fast atoms of 100m/s can be reflected very efficiently at such a surface structure. In order to quantitatively describe our data, we have developed a theoretical description of the reflection and scattering of atomic waves from our surface structures. As a first approximation we can assume that the van der Waals constant is reduced by a factor l/L, where l is the size at the top of the ridges and L the distance between the ridges. The reflectivity on the ridges structures then follows immediately from the scaling law of the quantum reflection. Deviations appear when the ratio l/L is very small. In the limiting case of l/L→0, i.e. of idealized thin ridges, a new interesting effect can be observed: The atomic wave is reflected due to the Fresnel diffraction at the array of ridges., 16340116
2004 - 2006 - Atom Optics (Technical Application of Laser Cooling)
SHIMIZU Fujio; NAKAGAWA Ken-ichi; SHUNIZU Kazuto; MORINAGA Atsuo; SHIRAHAMA Keiya; MORINAGA Makoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research on Priority Areas, We have worked in three areas of atom optics. (1)The development of atom optics components by Shimizu's group, (2)the study of atom chips with Rb BEC by Nakagawa's group, and (3)atom interferometries by Morinaga's group. (1) Various components were demonstrated by using an ultra-cold metastable neon atomic beam. The focusing of an atomic beam with a static electric lens, arbitrary patterning of an atomic beam with a transmission type hologram made of SiN thin film were demonstrated. By depositing electrodes on the hologram of the SiN film we demonstrated real time control of holographic image of atoms. The group also experimentally verified quantum reflection on a solid surface for the first time. Furthermore, they found mat the reflectivity can be improved remarkably by modifying me slid surface. This result was applied to make a reflective type hologram, beam splitter and one dimensional focusing lens. (2) Nakagawa's group developed a rubidium BEC (the third in this country). Loading of atoms from BEC in mind, they constructed an atom chip consisting of miniature wires carrying current to guide and trap atoms. Preliminary experiment of loading laser cooled atoms was verified. The group also worked on a rubidium atom interferometer that is aimed to measure gravity G constant. (3) Morinaga's group studied on a thermal calcium atom interferometer and a laser cooled sodium atom interferometer. With calcium they measured Aharonov-Casher phase shift with an accuracy better than 3%. With sodium they demonstrated time-domain multiple interferometer that had a finesse better than 100., 11216202
1999 - 2002 - 電場による原子結像系の開発
森永 実
日本学術振興会, 科学研究費助成事業, 東京大学, 奨励研究(A), 原子のレーザー冷却の技術が発展する中、原子光学の実現に向けて原子結像系の開発が急がれているが、いまだ実用化に到っていない。 我々は昨年夏世界に先駆けて原子線による像再生「原子線ホログラフィー」に成功したが、原子結像系を用いなかったため、いわばレンズを使ったカメラに対するピンホールカメラのようなもので、その解像度は低く再生した像は1文字「F」という簡単なものであった。 そこで当初の計画とは多少異なるが、ホログラム自体に凸レンズの機能を組み込むことを行った。すなわちホログラムのパターンを計算する際に入射する原子波を球面波であり、またスクリーンが有限の距離にあることを考慮に入れ、別途の結像系を用いることなくても一点から出射した原子がスクリーン上でシャープな像を結ぶように設計したのである。このことにより長さ0.7mm、解像度50ミクロン程度の3文字の像再生に成功した。また近々20文字程度の像再生が可能となる予定である。 ところでこのようにして得られる再生像の解像度は、理論的な検討を行った結果ホログラムのパターンのピッチ程度よりは良くならないことが判った。これはこの方法では回折せずに透過してくる原子による0次のスポットが有限の大きさを持ちホログラムをスクリーンに近づけることを妨げるために、開口指数NAを大きく取れないからである。折角原子は波として短い波長を持つのであるからこれは残念である。そこでこれを回避するためにホログラムと電場による結像系を併用する像再生の実験を計画している。, 07740345
1995 - 1995 - AC電場による3次元中性原子・分子トラップ
森永 実
日本学術振興会, 科学研究費助成事業, 東京大学, 奨励研究(A), 本研究の目的は、AC電場を用いて中性粒子を種類を問わずトラップすることである。 理論面ではその安定性について我々は既にある程度解析を行っていたが、それらは安定度を定量的に評価するために、線形化した運動方程式を用いていた。AC電場を用いた中性粒子のトラップのポテンシャルは既ねRFイオントラップとのアナロジーが成り立つが、前者の場合、後者と異なり電極の形状を工夫しても非線形項を完全に取り除くことは原理的に不可能である。そこで非線形項の小さい電極形状を考察するとともに、非線形項も含めた完全な運動方程式を用いて安定性の解析を行った。非線形項を含めると解が本質的に不安定になることが密かに心配されたが、解析の結果定性的には線形化した場合と同様の結果を得た。ただし、非線形項を含めると解の安定領域はある程度狭くなる。 実験の法であるが、光磁気トラップ(MOT)から落ちてくるSr原子に下から^1S->^3Pの弱い遷移の光をあて、等速度でその下に置いたAC電場トラップの中にロードするというのが当初の計画であったが、ロードされる原子の絶対数が少ないこと(数10個/秒)と観測にも使っている弱い遷移が「弱い」(自然幅約 600Hz)こともありトラップを観測するには至っていない。今後ロードする原子数を増やすとともに、弱い遷移を観測する際の立体角を大きくする努力が必要と思われる。, 05740267
1993 - 1993 - 原子ジャイロスコープの試作
清水 富士夫; 森永 実
日本学術振興会, 科学研究費助成事業, 東京大学, 試験研究(B), ジャイロ干渉計の位相感度は2mωS/hで与えられるので、干渉計が囲む面積Sを大きくすることが望ましい。また、将来実用化されるためには、信頼性が高い半導体レーザーが使える方がよい。これらのことを考慮して、我々が今まで研究してきたNeの代りにArを用いた干渉計を試作することにし、設計を行った。Sを大きくするため、ダブルスリットに代えて回折格子をビームスプリッターとする干渉計を組むことにした。回折格子の採用は、我々が開発した静電的な原子レンズ利用や、ビーム合成時に同じ回折格子を使ってパターンマッチングによる干渉の検出が出来るため、今までよりはるかに検出原子数を大きくすることが出来ると結論された。実験は、他の研究と干渉しないように独立した真空装置を組み立てたため、若干予定より遅れているが、現在、2μmピッチの回折格子による回折実験に成功し、目下、ビームの合成実験を行う段階である。, 05555022
1993 - 1993