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United Kingdom

7,637 Works

Characterizing the 3-D field distortions in low numerical aperture fluorescence zooming microscope

Praveen Pankajakshan, Zvi Kam, Alain Dieterlen & Jean-Christophe Olivo-Marin
In this article, we characterize the lateral field distortions in a low numerical aperture and large field-of-view (FOV) fluorescence imaging system. To this end, we study a commercial fluorescence MACROscope setup, which is a zooming microscope. The versatility of this system lies in its ability to image at different zoom ranges, so that sample preparations can be examined in three-dimensions, at cellular, organ and whole body levels. Yet, we found that the imaging system’s optics...

Characterizing the 3-D field distortions in low numerical aperture fluorescence zooming microscope

Praveen Pankajakshan, Zvi Kam, Alain Dieterlen & Jean-Christophe Olivo-Marin
In this article, we characterize the lateral field distortions in a low numerical aperture and large field-of-view (FOV) fluorescence imaging system. To this end, we study a commercial fluorescence MACROscope setup, which is a zooming microscope. The versatility of this system lies in its ability to image at different zoom ranges, so that sample preparations can be examined in three-dimensions, at cellular, organ and whole body levels. Yet, we found that the imaging system’s optics...

Hollow sinh-Gaussian beams and their paraxial properties

Qiongge Sun, Keya Zhou, Guangyu Fang, Guoqiang Zhang, Zhengjun Liu & Shutian Liu
A new mathematical model of dark-hollow beams, described as hollow sinh-Gaussian (HsG) beams, has been introduced. The intensity distributions of HsG beams are characterized by a single bright ring along the propagation whose size is determined by the order of beams; the shape of the ring can be controlled by beam width and this leads to the elliptical HsG beams. Propagation characteristics of HsG beams through an ABCD optical system have been researched, they can...

Hollow sinh-Gaussian beams and their paraxial properties

Qiongge Sun, Keya Zhou, Guangyu Fang, Guoqiang Zhang, Zhengjun Liu & Shutian Liu
A new mathematical model of dark-hollow beams, described as hollow sinh-Gaussian (HsG) beams, has been introduced. The intensity distributions of HsG beams are characterized by a single bright ring along the propagation whose size is determined by the order of beams; the shape of the ring can be controlled by beam width and this leads to the elliptical HsG beams. Propagation characteristics of HsG beams through an ABCD optical system have been researched, they can...

Thermal phase change actuator for self-tracking solar concentration

E. J. Tremblay, D. Loterie & C. Moser
We present a proof of principle demonstration of a reversible in-plane actuator activated by focused sunlight, and describe a concept for its use as a self-tracking mechanism in a planar solar concentrator. By actuating at the location of focused sunlight and splitting the solar spectrum for actuation energy, this phase change device aims to provide the adaptive mechanism necessary to efficiently couple concentrated solar light from a lens into a planar lightguide in a manner...

Optically generated reconfigurable photonic structures of elastic quasiparticles in frustrated cholesteric liquid crystals

Ivan I. Smalyukh, Daniel Kaputa, Aliaksandr V. Kachynski, Andrey N. Kuzmin, Paul J. Ackerman, Christopher W. Twombly, Taewoo Lee, Rahul P. Trivedi & Paras N. Prasad
We describe laser-induced two-dimensional periodic photonic structures formed by localized particle-like excitations in an untwisted confined cholesteric liquid crystal. The individual particle-like excitations (dubbed “Torons”) contain three-dimensional twist of the liquid crystal director matched to the uniform background director field by topological point defects. Using both single-beam-steering and holographic pattern generation approaches, the periodic crystal lattices are tailored by tuning their periodicity, reorienting their crystallographic axes, and introducing defects. Moreover, these lattices can be dynamically...

Optically generated reconfigurable photonic structures of elastic quasiparticles in frustrated cholesteric liquid crystals

Ivan I. Smalyukh, Daniel Kaputa, Aliaksandr V. Kachynski, Andrey N. Kuzmin, Paul J. Ackerman, Christopher W. Twombly, Taewoo Lee, Rahul P. Trivedi & Paras N. Prasad
We describe laser-induced two-dimensional periodic photonic structures formed by localized particle-like excitations in an untwisted confined cholesteric liquid crystal. The individual particle-like excitations (dubbed “Torons”) contain three-dimensional twist of the liquid crystal director matched to the uniform background director field by topological point defects. Using both single-beam-steering and holographic pattern generation approaches, the periodic crystal lattices are tailored by tuning their periodicity, reorienting their crystallographic axes, and introducing defects. Moreover, these lattices can be dynamically...

Thermal phase change actuator for self-tracking solar concentration

E. J. Tremblay, D. Loterie & C. Moser
We present a proof of principle demonstration of a reversible in-plane actuator activated by focused sunlight, and describe a concept for its use as a self-tracking mechanism in a planar solar concentrator. By actuating at the location of focused sunlight and splitting the solar spectrum for actuation energy, this phase change device aims to provide the adaptive mechanism necessary to efficiently couple concentrated solar light from a lens into a planar lightguide in a manner...

Light induced fluidic waveguide coupling

Volker Zagolla, Eric Tremblay & Christophe Moser
We report on the development of an opto-fluidic waveguide coupling mechanism for planar solar concentration. This mechanism is self-adaptive and light-responsive to efficiently maintain waveguide coupling and concentration independent of incoming light’s direction. Vapor bubbles are generated inside a planar, liquid waveguide using infrared light on an infrared absorbing glass. Visible light focused onto the bubble is then reflected by total internal reflection (TIR) at the liquid-gas interface and coupled into the waveguide. Vapor bubbles...

Light induced fluidic waveguide coupling

Volker Zagolla, Eric Tremblay & Christophe Moser
We report on the development of an opto-fluidic waveguide coupling mechanism for planar solar concentration. This mechanism is self-adaptive and light-responsive to efficiently maintain waveguide coupling and concentration independent of incoming light’s direction. Vapor bubbles are generated inside a planar, liquid waveguide using infrared light on an infrared absorbing glass. Visible light focused onto the bubble is then reflected by total internal reflection (TIR) at the liquid-gas interface and coupled into the waveguide. Vapor bubbles...

Intra-cavity gain shaping of mode-locked Ti:Sapphire laser oscillations

Shai Yefet, Na’Aman Amer & Avi Pe’Er
The gain properties of an oscillator strongly affect its behavior. When the gain is homogeneous, different modes compete for gain resources in a ‘winner takes all’ manner, whereas with inhomogeneous gain, modes can coexist if they utilize different gain resources. We demonstrate precise control over the mode competition in a mode locked Ti:sapphire oscillator by manipulation and spectral shaping of the gain properties, thus steering the competition towards a desired, otherwise inaccessible, oscillation. Specifically, by...

Intra-cavity gain shaping of mode-locked Ti:Sapphire laser oscillations

Shai Yefet, Na’Aman Amer & Avi Pe’Er
The gain properties of an oscillator strongly affect its behavior. When the gain is homogeneous, different modes compete for gain resources in a ‘winner takes all’ manner, whereas with inhomogeneous gain, modes can coexist if they utilize different gain resources. We demonstrate precise control over the mode competition in a mode locked Ti:sapphire oscillator by manipulation and spectral shaping of the gain properties, thus steering the competition towards a desired, otherwise inaccessible, oscillation. Specifically, by...

Table screen 360-degree three-dimensional display using a small array of high-speed projectors

Yasuhiro Takaki & Shigeki Uchida
We propose a 360-degree three-dimensional display with a table screen, which consists of a small number of high-speed projectors and a rotating screen. Because each high-speed projector is located outside the rotating axis of the screen, multiple projectors can be aligned. The lens shift technique is used to superimpose multiple images generated by all projectors on the rotating screen. The screen has an off-axis lens function such that the rotation of the screen generates numerous...

Table screen 360-degree three-dimensional display using a small array of high-speed projectors

Yasuhiro Takaki & Shigeki Uchida
We propose a 360-degree three-dimensional display with a table screen, which consists of a small number of high-speed projectors and a rotating screen. Because each high-speed projector is located outside the rotating axis of the screen, multiple projectors can be aligned. The lens shift technique is used to superimpose multiple images generated by all projectors on the rotating screen. The screen has an off-axis lens function such that the rotation of the screen generates numerous...

Plasmonic nanotweezers: strong influence of adhesion layer and nanostructure orientation on trapping performance

Brian J. Roxworthy & Kimani C. Toussaint
Using Au bowtie nanoantennas arrays (BNAs), we demonstrate that the performance and capability of plasmonic nanotweezers is strongly influenced by both the material comprising the thin adhesion layer used to fix Au to a glass substrate and the nanostructure orientation with respect to incident illumination. We find that a Ti adhesion layer provides up to 30% larger trap stiffness and efficiency compared to a Cr layer of equal thickness. Orientation causes the BNAs to operate...

Plasmonic nanotweezers: strong influence of adhesion layer and nanostructure orientation on trapping performance

Brian J. Roxworthy & Kimani C. Toussaint
Using Au bowtie nanoantennas arrays (BNAs), we demonstrate that the performance and capability of plasmonic nanotweezers is strongly influenced by both the material comprising the thin adhesion layer used to fix Au to a glass substrate and the nanostructure orientation with respect to incident illumination. We find that a Ti adhesion layer provides up to 30% larger trap stiffness and efficiency compared to a Cr layer of equal thickness. Orientation causes the BNAs to operate...

Polarization holographic microscopy for extracting spatio-temporally resolved Jones matrix

Youngchan Kim, Joonwoo Jeong, Jaeduck Jang, Mahn Won Kim & YongKeun Park
We present a high-speed holographic microscopic technique for quantitative measurement of polarization light-field, referred to as polarization holographic microscopy (PHM). Employing the principle of common-path interferometry, PHM quantitatively measures the spatially resolved Jones matrix components of anisotropic samples with only two consecutive measurements of spatially modulated holograms. We demonstrate the features of PHM with imaging the dynamics of liquid crystal droplets at a video-rate.

Polarization holographic microscopy for extracting spatio-temporally resolved Jones matrix

Youngchan Kim, Joonwoo Jeong, Jaeduck Jang, Mahn Won Kim & YongKeun Park
We present a high-speed holographic microscopic technique for quantitative measurement of polarization light-field, referred to as polarization holographic microscopy (PHM). Employing the principle of common-path interferometry, PHM quantitatively measures the spatially resolved Jones matrix components of anisotropic samples with only two consecutive measurements of spatially modulated holograms. We demonstrate the features of PHM with imaging the dynamics of liquid crystal droplets at a video-rate.

Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming

Andrew Bañas, Darwin Palima & Jesper Glückstad
We report on a new beam-forming system for generating high intensity programmable optical spikes using so-called matched-filtering Generalized Phase Contrast (mGPC) applying two consumer handheld pico-projectors. Such a system presents a low-cost alternative for optical trapping and manipulation, optical lattices and other beam-shaping applications usually implemented with high-end spatial light modulators. Portable pico-projectors based on liquid crystal on silicon (LCoS) devices are used as binary phase-only spatial light modulators by carefully setting the appropriate polarization...

Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming

Andrew Bañas, Darwin Palima & Jesper Glückstad
We report on a new beam-forming system for generating high intensity programmable optical spikes using so-called matched-filtering Generalized Phase Contrast (mGPC) applying two consumer handheld pico-projectors. Such a system presents a low-cost alternative for optical trapping and manipulation, optical lattices and other beam-shaping applications usually implemented with high-end spatial light modulators. Portable pico-projectors based on liquid crystal on silicon (LCoS) devices are used as binary phase-only spatial light modulators by carefully setting the appropriate polarization...

Fabrication of three dimensional split ring resonators by stress-driven assembly method

Che Chin Chen, Chih Ting Hsiao, Shulin Sun, Kuang-Yu Yang, Pin Chieh Wu, Wei Ting Chen, Yu Hsiang Tang, Yuan-Fong Chau, Eric Plum, Guang-Yu Guo, Nikolay I. Zheludev & Din Ping Tsai
We demonstrate a self-assembly strategy for fabricating three dimensional (3D) metamaterials. This strategy represents the desired 3D curving prongs of the split ring resonators (SRRs) erected by metal stress force with appropriate thin film parameters. Transmittance spectra and field patterns corresponding to each resonance modes are calculated by finite element method (FEM). The eigen-modes of the SRRs can be excited by normal illumination with polarization state parallel to the erected SRRs, which are unlike for...

Fabrication of three dimensional split ring resonators by stress-driven assembly method

Che Chin Chen, Chih Ting Hsiao, Shulin Sun, Kuang-Yu Yang, Pin Chieh Wu, Wei Ting Chen, Yu Hsiang Tang, Yuan-Fong Chau, Eric Plum, Guang-Yu Guo, Nikolay I. Zheludev & Din Ping Tsai
We demonstrate a self-assembly strategy for fabricating three dimensional (3D) metamaterials. This strategy represents the desired 3D curving prongs of the split ring resonators (SRRs) erected by metal stress force with appropriate thin film parameters. Transmittance spectra and field patterns corresponding to each resonance modes are calculated by finite element method (FEM). The eigen-modes of the SRRs can be excited by normal illumination with polarization state parallel to the erected SRRs, which are unlike for...

Surpassing digital holography limits by lensless object scanning holography

Vicente Micó, Carlos Ferreira & Javier García
We present lensless object scanning holography (LOSH) as a fully lensless method, capable of improving image quality in reflective digital Fourier holography, by means of an extremely simplified experimental setup. LOSH is based on the recording and digital post-processing of a set of digital lensless holograms and results in a synthetic image with improved resolution, field of view (FOV), signal-to-noise ratio (SNR), and depth of field (DOF). The superresolution (SR) effect arises from the generation...

Surpassing digital holography limits by lensless object scanning holography

Vicente Micó, Carlos Ferreira & Javier García
We present lensless object scanning holography (LOSH) as a fully lensless method, capable of improving image quality in reflective digital Fourier holography, by means of an extremely simplified experimental setup. LOSH is based on the recording and digital post-processing of a set of digital lensless holograms and results in a synthetic image with improved resolution, field of view (FOV), signal-to-noise ratio (SNR), and depth of field (DOF). The superresolution (SR) effect arises from the generation...

Spatiotemporal focusing-based widefield multiphoton microscopy for fast optical sectioning

Li-Chung Cheng, Chia-Yuan Chang, Chun-Yu Lin, Keng-Chi Cho, Wei-Chung Yen, Nan-Shan Chang, Chris Xu, Chen Yuan Dong & Shean-Jen Chen
In this study, a microscope based on spatiotemporal focusing offering widefield multiphoton excitation has been developed to provide fast optical sectioning images. Key features of this microscope are the integrations of a 10 kHz repetition rate ultrafast amplifier featuring high instantaneous peak power (maximum 400 μJ/pulse at a 90 fs pulse width) and a TE-cooled, ultra-sensitive photon detecting, electron multiplying charge-coupled camera into a spatiotemporal focusing microscope. This configuration can produce multiphoton images with an...

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