1
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Temma K, Oketani R, Kubo T, Bando K, Maeda S, Sugiura K, Matsuda T, Heintzmann R, Kaminishi T, Fukuda K, Hamasaki M, Nagai T, Fujita K. Selective-plane-activation structured illumination microscopy. Nat Methods 2024; 21:889-896. [PMID: 38580844 DOI: 10.1038/s41592-024-02236-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 03/05/2024] [Indexed: 04/07/2024]
Abstract
The background light from out-of-focus planes hinders resolution enhancement in structured illumination microscopy when observing volumetric samples. Here we used selective plane illumination and reversibly photoswitchable fluorescent proteins to realize structured illumination within the focal plane and eliminate the out-of-focus background. Theoretical investigation of the imaging properties and experimental demonstrations show that selective plane activation is beneficial for imaging dense microstructures in cells and cell spheroids.
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Affiliation(s)
- Kenta Temma
- Department of Applied Physics, Osaka University, Osaka, Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory, AIST-Osaka University, Osaka, Japan
- Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan
| | - Ryosuke Oketani
- Department of Applied Physics, Osaka University, Osaka, Japan
- Department of Chemistry, Kyushu University, Fukuoka, Japan
| | - Toshiki Kubo
- Department of Applied Physics, Osaka University, Osaka, Japan
| | - Kazuki Bando
- Department of Applied Physics, Osaka University, Osaka, Japan
| | - Shunsuke Maeda
- Department of Applied Physics, Osaka University, Osaka, Japan
| | - Kazunori Sugiura
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Osaka, Japan
| | - Tomoki Matsuda
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Osaka, Japan
| | - Rainer Heintzmann
- Leibniz Institute of Photonic Technology, Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller University Jena, Jena, Germany
| | - Tatsuya Kaminishi
- Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Koki Fukuda
- Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan
- Laboratory of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Maho Hamasaki
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan
- Laboratory of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Takeharu Nagai
- Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Osaka, Japan
- Research Institute for Electronic Science, Hokkaido University, Hokkaido, Japan
| | - Katsumasa Fujita
- Department of Applied Physics, Osaka University, Osaka, Japan.
- Advanced Photonics and Biosensing Open Innovation Laboratory, AIST-Osaka University, Osaka, Japan.
- Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan.
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2
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Masui K, Nawa Y, Tokumitsu S, Nagano T, Kawarai M, Tanaka H, Hamamoto T, Minoshima W, Tani T, Fujita S, Ishitobi H, Hosokawa C, Inouye Y. Detection of Glutamate Encapsulated in Liposomes by Optical Trapping Raman Spectroscopy. ACS OMEGA 2022; 7:9701-9709. [PMID: 35350315 PMCID: PMC8945065 DOI: 10.1021/acsomega.1c07206] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 02/10/2022] [Indexed: 05/06/2023]
Abstract
The transmission of neuronal information is propagated through synapses by neurotransmitters released from presynapses to postsynapses. Neurotransmitters released from the presynaptic vesicles activate receptors on the postsynaptic membrane. Glutamate acts as a major excitatory neurotransmitter for synaptic vesicles in the central nervous system. Determining the concentration of glutamate in single synaptic vesicles is essential for understanding the mechanisms of neuronal activation by glutamate in normal brain functions as well as in neurological diseases. However, it is difficult to detect and quantitatively measure the concentration of glutamate in single synaptic vesicles owing to their small size, i.e., ∼40 nm. In this study, to quantitatively evaluate the concentrations of the contents in small membrane-bound vesicles, we developed an optical trapping Raman spectroscopic system that analyzes the Raman spectra of small objects captured using optical trapping. Using artificial liposomes encapsulating glutamate that mimic synaptic vesicles, we investigated whether spontaneous Raman scattered light of glutamate can be detected from vesicles trapped at the focus using optical forces. A 575 nm laser beam was used to simultaneously perform the optical trapping of liposomes and the detection of the spontaneous Raman scattered light. The intensity of Raman scattered light that corresponds to lipid bilayers increased with time. This observation suggested that the number of liposomes increased at the focal point. The number of glutamate molecules in the trapped liposomes was estimated from the calibration curve of the Raman spectra of glutamate solutions with known concentration. This method can be used to measure the number of glutamate molecules encapsulated in synaptic vesicles in situ.
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Affiliation(s)
- Kyoko Masui
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Graduate
School of Frontier Biosciences, Osaka University, 1-3, Yamadaoka,
Suita, Osaka 5650871, Japan
| | - Yasunori Nawa
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
| | - Shunsuke Tokumitsu
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
| | - Takahiro Nagano
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
| | - Makoto Kawarai
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
| | - Hirokazu Tanaka
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
| | - Tatsuki Hamamoto
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Graduate
School of Frontier Biosciences, Osaka University, 1-3, Yamadaoka,
Suita, Osaka 5650871, Japan
| | - Wataru Minoshima
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Chemistry, Division of Molecular Materials Science, Graduate School
of Science, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi, Osaka 5588585, Japan
| | - Tomomi Tani
- Biomedical
Research Institute, National Institute of
Advanced Industrial Science and Technology, 2-1, Yamadaoka, Suita, Osaka 5650871, Japan
| | - Satoshi Fujita
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
| | - Hidekazu Ishitobi
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Graduate
School of Frontier Biosciences, Osaka University, 1-3, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
| | - Chie Hosokawa
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Chemistry, Division of Molecular Materials Science, Graduate School
of Science, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi, Osaka 5588585, Japan
| | - Yasushi Inouye
- Advanced
Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, 2-1, Yamadaoka,
Suita, Osaka 5650871, Japan
- Graduate
School of Frontier Biosciences, Osaka University, 1-3, Yamadaoka,
Suita, Osaka 5650871, Japan
- Department
of Applied Physics, Graduate School of Engineering, Osaka University, 2-1,
Yamadaoka, Suita, Osaka 5650871, Japan
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3
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Mizuta Y. Advances in Two-Photon Imaging in Plants. PLANT & CELL PHYSIOLOGY 2021; 62:1224-1230. [PMID: 34019083 PMCID: PMC8579158 DOI: 10.1093/pcp/pcab062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 03/16/2021] [Accepted: 05/20/2021] [Indexed: 05/06/2023]
Abstract
Live and deep imaging play a significant role in the physiological and biological study of organisms. Two-photon excitation microscopy (2PEM), also known as multiphoton excitation microscopy, is a fluorescent imaging technique that allows deep imaging of living tissues. Two-photon lasers use near-infrared (NIR) pulse lasers that are less invasive and permit deep tissue penetration. In this review, recent advances in two-photon imaging and their applications in plant studies are discussed. Compared to confocal microscopy, NIR 2PEM exhibits reduced plant-specific autofluorescence, thereby achieving greater depth and high-resolution imaging in plant tissues. Fluorescent proteins with long emission wavelengths, such as orange-red fluorescent proteins, are particularly suitable for two-photon live imaging in plants. Furthermore, deep- and high-resolution imaging was achieved using plant-specific clearing methods. In addition to imaging, optical cell manipulations can be performed using femtosecond pulsed lasers at the single cell or organelle level. Optical surgery and manipulation can reveal cellular communication during development. Advances in in vivo imaging using 2PEM will greatly benefit biological studies in plant sciences.
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Affiliation(s)
- Yoko Mizuta
- Institute for Advanced Research (IAR), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
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4
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Lang RT, Spring BQ. Two-photon peak molecular brightness spectra reveal long-wavelength enhancements of multiplexed imaging depth and photostability. BIOMEDICAL OPTICS EXPRESS 2021; 12:5909-5919. [PMID: 34692224 PMCID: PMC8515958 DOI: 10.1364/boe.433989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 08/23/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
The broad use of two-photon microscopy has been enabled in part by Ti:Sapphire femtosecond lasers, which offer a wavelength-tunable source of pulsed excitation. Action spectra have thus been primarily reported for the tunable range of Ti:Sapphire lasers (∼700-1000 nm). However, longer wavelengths offer deeper imaging in tissue via reduced scattering and spectral dips in water absorption, and new generations of pulsed lasers offer wider tunable ranges. We present the peak molecular brightness spectra for eight Alexa Fluor dyes between 700-1300 nm as a first-order surrogate for action spectra measured with an unmodified commercial microscope, which reveal overlapping long-wavelength excitation peaks with potential for multiplexed excitation. We demonstrate simultaneous single-wavelength excitation of six spectrally overlapping fluorophores using either short (∼790 nm) or long (∼1090 nm) wavelengths, and that the newly characterized excitation peaks measured past 1000 nm offer improved photostability and enhanced fidelity of linear spectral unmixing at depth compared to shorter wavelengths.
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Affiliation(s)
- Ryan T. Lang
- Translational Biophotonics Cluster, Northeastern University, Boston, MA 02115, USA
- Department of Physics, Northeastern University, Boston, MA 02115, USA
| | - Bryan Q. Spring
- Translational Biophotonics Cluster, Northeastern University, Boston, MA 02115, USA
- Department of Physics, Northeastern University, Boston, MA 02115, USA
- Department of Bioengineering, Northeastern University, Boston, MA 02115, USA
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5
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Yousefalizadeh G, Ahmadi S, Mosey NJ, Stamplecoskie KG. Exciting clusters, what does off-resonance actually mean? NANOSCALE 2021; 13:242-252. [PMID: 33331367 DOI: 10.1039/d0nr06493a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Noble metal clusters have unique photophysical properties, especially as a new class of materials for multiphoton biomedical imaging. The previously studied Au25SR18 exhibits "giant" two-photon absorbance cross sections. Herein, we investigate the origins of the large two photon absorption for Au25SR18, as well as 10 other Au and Ag clusters using femtosecond pump/probe transient absorption spectroscopy (fsTAS). Excited state absorbance (ESA) ubiquitous to thiolated Au and Ag clusters is used herein as an optical signature of two-photon absorbances of the 11 different Au and Ag clusters, which does not require high quantum yields of emission. The large selection of clusters, studied with a single laser system, allows us to draw conclusions on the role of the particular metal, cluster size/structure, and the effects of the ligands on the ability to absorb multiple NIR photons. The use of a laser with a 1028 nm excitation also allows us to investigate the dramatic effect of excitation wavelength and explain why laser wavelength has led to large variances in the non-linear responses reported for clusters to date. We discuss the double resonance mechanism, responsible for giant two photon absorbance cross-sections, helping match properties of metal clusters with experimental conditions for maximizing signal/response in multiphoton applications.
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Affiliation(s)
- Goonay Yousefalizadeh
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada.
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6
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Kubo T, Temma K, Smith NI, Lu K, Matsuda T, Nagai T, Fujita K. Hyperspectral two-photon excitation microscopy using visible wavelength. OPTICS LETTERS 2021; 46:37-40. [PMID: 33362007 DOI: 10.1364/ol.413526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 11/08/2020] [Indexed: 05/28/2023]
Abstract
We demonstrate hyperspectral imaging by visible-wavelength two-photon excitation microscopy using line illumination and slit-confocal detection. A femtosecond pulsed laser light at 530 nm was used for the simultaneous excitation of fluorescent proteins with different emission wavelengths. The use of line illumination enabled efficient detection of hyperspectral images and achieved simultaneous detection of three fluorescence spectra in the observation of living HeLa cells with an exposure time of 1 ms per line, which is equivalent to about 2 µs per pixel in point scanning, with 160 data points per spectrum. On combining linear spectral unmixing techniques, localization of fluorescent probes in the cells was achieved. A theoretical investigation of the imaging property revealed high-depth discrimination property attained through the combination of nonlinear excitation and slit detection.
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7
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Oketani R, Suda H, Uegaki K, Kubo T, Matsuda T, Yamanaka M, Arai Y, Smith NI, Nagai T, Fujita K. Visible-wavelength two-photon excitation microscopy with multifocus scanning for volumetric live-cell imaging. JOURNAL OF BIOMEDICAL OPTICS 2019; 25:1-5. [PMID: 31691550 PMCID: PMC7008499 DOI: 10.1117/1.jbo.25.1.014502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 06/03/2019] [Indexed: 05/05/2023]
Abstract
Two-photon excitation microscopy is one of the key techniques used to observe three-dimensional (3-D) structures in biological samples. We utilized a visible-wavelength laser beam for two-photon excitation in a multifocus confocal scanning system to improve the spatial resolution and image contrast in 3-D live-cell imaging. Experimental and numerical analyses revealed that the axial resolution has improved for a wide range of pinhole sizes used for confocal detection. We observed the 3-D movements of the Golgi bodies in living HeLa cells with an imaging speed of 2 s per volume. We also confirmed that the time-lapse observation up to 8 min did not cause significant cell damage in two-photon excitation experiments using wavelengths in the visible light range. These results demonstrate that multifocus, two-photon excitation microscopy with the use of a visible wavelength can constitute a simple technique for 3-D visualization of living cells with high spatial resolution and image contrast.
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Affiliation(s)
- Ryosuke Oketani
- Osaka University, Department of Applied Physics, Suita, Osaka, Japan
| | - Haruka Suda
- Osaka University, Department of Applied Physics, Suita, Osaka, Japan
| | - Kumiko Uegaki
- Osaka University, Department of Applied Physics, Suita, Osaka, Japan
| | - Toshiki Kubo
- Osaka University, Department of Applied Physics, Suita, Osaka, Japan
- AIST-Osaka University, Advanced Photonics and Biosensing Open Innovation Laboratory, Suita, Osaka, Japan
| | - Tomoki Matsuda
- Osaka University, Institute of Scientific and Industrial Research, Ibaraki, Osaka, Japan
| | - Masahito Yamanaka
- Osaka University, Department of Applied Physics, Suita, Osaka, Japan
| | - Yoshiyuki Arai
- Osaka University, Institute of Scientific and Industrial Research, Ibaraki, Osaka, Japan
| | - Nicholas I. Smith
- Osaka University, Immunology Frontier Research Center, Suita, Osaka, Japan
| | - Takeharu Nagai
- Osaka University, Institute of Scientific and Industrial Research, Ibaraki, Osaka, Japan
- Osaka University, Institute for Open and Transdisciplinary Research Initiatives, Transdimensional Life Imaging Division, Suita, Osaka, Japan
| | - Katsumasa Fujita
- Osaka University, Department of Applied Physics, Suita, Osaka, Japan
- AIST-Osaka University, Advanced Photonics and Biosensing Open Innovation Laboratory, Suita, Osaka, Japan
- Osaka University, Institute for Open and Transdisciplinary Research Initiatives, Transdimensional Life Imaging Division, Suita, Osaka, Japan
- Address all correspondence to Katsumasa Fujita, E-mail:
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8
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Liu X, Laegsgaard J, Iegorov R, Svane AS, Ilday FÖ, Tu H, Boppart SA, Turchinovich D. Nonlinearity-tailored fiber laser technology for low-noise, ultra-wideband tunable femtosecond light generation. PHOTONICS RESEARCH 2017; 5:750-761. [PMID: 30555846 PMCID: PMC6294458 DOI: 10.1364/prj.5.000750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 10/26/2017] [Indexed: 05/04/2023]
Abstract
The emission wavelength of a laser is physically predetermined by the gain medium used. Consequently, arbitrary wavelength generation is a fundamental challenge in the science of light. Present solutions include optical parametric generation, requiring complex optical setups and spectrally sliced supercontinuum, taking advantage of a simpler fiber technology: a fixed-wavelength pump laser pulse is converted into a spectrally very broadband output, from which the required resulting wavelength is then optically filtered. Unfortunately, this process is associated with an inherently poor noise figure, which often precludes many realistic applications of such super-continuum sources. Here, we show that by adding only one passive optical element-a tapered photonic crystal fiber-to a fixed-wavelength femtosecond laser, one can in a very simple manner resonantly convert the laser emission wavelength into an ultra-wide and continuous range of desired wavelengths, with very low inherent noise, and without mechanical realignment of the laser. This is achieved by exploiting the double interplay of nonlinearity and chirp in the laser source and chirp and phase matching in the tapered fiber. As a first demonstration of this simple and inexpensive technology, we present a femtosecond fiber laser continuously tunable across the entire red-green-blue spectral range.
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Affiliation(s)
- Xiaomin Liu
- DTU Fotonik, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Jesper Laegsgaard
- DTU Fotonik, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Roman Iegorov
- Department of Physics, Bilkent University, 06800 Ankara, Turkey
- National Research Tomsk Polytechnic University, Institute of Power Engineering, 30 Lenin Avenue, 634050 Tomsk, Russia
| | - Ask S. Svane
- DTU Fotonik, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - F. Ömer Ilday
- Department of Physics, Bilkent University, 06800 Ankara, Turkey
- Department of Electrical and Electronics Engineering, Bilkent University, 06800 Ankara, Turkey
| | - Haohua Tu
- Biophotonics Imaging Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Stephen A. Boppart
- Biophotonics Imaging Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Dmitry Turchinovich
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Fakultät für Physik, Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany
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9
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Cui Q, Chen Z, Liu Q, Zhang Z, Luo Q, Fu L. Visible continuum pulses based on enhanced dispersive wave generation for endogenous fluorescence imaging. BIOMEDICAL OPTICS EXPRESS 2017; 8:4026-4036. [PMID: 28966844 PMCID: PMC5611920 DOI: 10.1364/boe.8.004026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 07/31/2017] [Accepted: 07/31/2017] [Indexed: 06/07/2023]
Abstract
In this study, we demonstrate endogenous fluorescence imaging using visible continuum pulses based on 100-fs Ti:sapphire oscillator and a nonlinear photonic crystal fiber. Broadband (500-700 nm) and high-power (150 mW) continuum pulses are generated through enhanced dispersive wave generation by pumping femtosecond pulses at the anomalous dispersion region near zero-dispersion wavelength of high-nonlinear photonic crystal fibers. We also minimize the continuum pulse width by determining the proper fiber length. The visible-wavelength two-photon microscopy produces NADH and tryptophan images of mice tissues simultaneously. Our 500-700 nm continuum pulses support extending nonlinear microscopy to visible wavelength range that is inaccessible to 100-fs Ti:sapphire oscillators and other applications requiring visible laser pulses.
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Affiliation(s)
- Quan Cui
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Zhongyun Chen
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Qian Liu
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Zhihong Zhang
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Qingming Luo
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Ling Fu
- Collaborative Innovation Center for Biomedical Engineering, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Britton Chance Center and MOE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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10
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Chiu LD, Ichimura T, Sekiya T, Machiyama H, Watanabe T, Fujita H, Ozawa T, Fujita K. Protein expression guided chemical profiling of living cells by the simultaneous observation of Raman scattering and anti-Stokes fluorescence emission. Sci Rep 2017; 7:43569. [PMID: 28272392 PMCID: PMC5341087 DOI: 10.1038/srep43569] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 01/25/2017] [Indexed: 01/02/2023] Open
Abstract
Our current understanding of molecular biology provides a clear picture of how the genome, transcriptome and proteome regulate each other, but how the chemical environment of the cell plays a role in cellular regulation remains much to be studied. Here we show an imaging method using hybrid fluorescence-Raman microscopy that measures the chemical micro-environment associated with protein expression patterns in a living cell. Simultaneous detection of fluorescence and Raman signals, realised by spectrally separating the two modes through the single photon anti-Stokes fluorescence emission of fluorescent proteins, enables the accurate correlation of the chemical fingerprint of a specimen to its physiological state. Subsequent experiments revealed the slight chemical differences that enabled the chemical profiling of mouse embryonic stem cells with and without Oct4 expression. Furthermore, using the fluorescent probe as localisation guide, we successfully analysed the detailed chemical content of cell nucleus and Golgi body. The technique can be further applied to a wide range of biomedical studies for the better understanding of chemical events during biological processes.
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Affiliation(s)
- Liang-da Chiu
- Department of Chemistry, the University of Tokyo, Tokyo, Japan.,Department of Applied Physics, Osaka University, Osaka, Japan
| | | | - Takumasa Sekiya
- Department of Applied Physics, Osaka University, Osaka, Japan
| | | | | | - Hideaki Fujita
- Quantitative Biology Center, RIKEN, Osaka, Japan.,Immunology Frontier Research Center, Osaka University, Osaka, Japan
| | - Takeaki Ozawa
- Department of Chemistry, the University of Tokyo, Tokyo, Japan
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11
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Oketani R, Doi A, Smith NI, Nawa Y, Kawata S, Fujita K. Saturated two-photon excitation fluorescence microscopy with core-ring illumination. OPTICS LETTERS 2017; 42:571-574. [PMID: 28146530 DOI: 10.1364/ol.42.000571] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We demonstrated resolution improvement in two-photon excitation microscopy by combining saturated excitation (SAX) of fluorescence and pupil manipulation. We theoretically estimated the resolution improvement and the sidelobe effect in the point spread function with various pupil designs and found that the combination of SAX and core-ring illumination can effectively enhance the spatial resolution in 3D and suppress sidelobe artifacts. The experimental demonstration shows that the proposed technique is effective for observation with a depth of 100 μm in a tissue phantom and can be applied to 3D observations of tissue samples with higher spatial resolution than conventional two-photon excitation microscopy.
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Trägårdh J, Murtagh M, Robb G, Parsons M, Lin J, Spence DJ, McConnell G. Two-Color, Two-Photon Imaging at Long Excitation Wavelengths Using a Diamond Raman Laser. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2016; 22:803-807. [PMID: 27492283 DOI: 10.1017/s143192761601151x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate that the second-Stokes output from a diamond Raman laser, pumped by a femtosecond Ti:Sapphire laser, can be used to efficiently excite red-emitting dyes by two-photon excitation at 1,080 nm and beyond. We image HeLa cells expressing red fluorescent protein, as well as dyes such as Texas Red and Mitotracker Red. We demonstrate the potential for simultaneous two-color, two-photon imaging with this laser by using the residual pump beam for excitation of a green-emitting dye. We demonstrate this for the combination of Alexa Fluor 488 and Alexa Fluor 568. Because the Raman laser extends the wavelength range of the Ti:Sapphire laser, resulting in a laser system tunable to 680-1,200 nm, it can be used for two-photon excitation of a large variety and combination of dyes.
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Affiliation(s)
- Johanna Trägårdh
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
| | - Michelle Murtagh
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
| | - Gillian Robb
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
| | - Maddy Parsons
- 3Randall Division of Cell and Molecular Biophysics,King's College London,Guy's Campus,London,SE11UL,UK
| | - Jipeng Lin
- 2MQ Photonics,Department of Physics and Astronomy,Macquarie University,NSW 2109,Australia
| | - David J Spence
- 2MQ Photonics,Department of Physics and Astronomy,Macquarie University,NSW 2109,Australia
| | - Gail McConnell
- 1Centre for Biophotonics,Strathclyde Institute of Pharmacy and Biomedical Sciences,University of Strathclyde,161 Cathedral Street,Glasgow,G4 0RE,UK
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Fujita K. Follow-up review: recent progress in the development of super-resolution optical microscopy. Microscopy (Oxf) 2016; 65:275-81. [PMID: 27385787 DOI: 10.1093/jmicro/dfw022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 05/19/2016] [Indexed: 11/12/2022] Open
Abstract
The advent of super-resolution microscopy brought a huge impact to various research fields ranging from the fundamental science to medical and industrial applications. The technological development is still ongoing with involving different scientific disciplines and often changing the standard of optical imaging. In this review, I would like to introduce the recent research progress in super-resolution microscopy as a follow-up for the featured issue in Microscopy (Vol. 64, No. 4, 2015) with discussions especially on the current trends and new directions in the technological development.
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