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https://www.readbyqxmd.com/read/29905742/precise-calibration-of-spatial-phase-response-nonuniformity-arising-in-liquid-crystal-on-silicon
#1
Jingquan Xu, SiYi Qin, Chen Liu, Songnian Fu, Deming Liu
In order to calibrate the spatial phase response nonuniformity of liquid crystal on silicon (LCoS), we propose to use a Twyman-Green interferometer to characterize the wavefront distortion, due to the inherent curvature of the device. During the characterization, both the residual carrier frequency introduced by the Fourier transform evaluation method and the lens aberration are error sources. For the tilted phase error introduced by residual carrier frequency, the least mean square fitting method is used to obtain the tilted phase error...
June 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29905685/phased-locked-two-color-single-soliton-microcombs-in-dispersion-engineered-si-3-n-4-resonators
#2
Gregory Moille, Qing Li, Sangsik Kim, Daron Westly, Kartik Srinivasan
We propose and theoretically investigate a dispersion-engineered Si3 N4 microring resonator, based on a cross section containing a partially-etched trench, that supports phase-locked, two-color soliton microcomb states. These soliton states consist of a single circulating intracavity pulse with a modulated envelope that sits on a continuous wave background. Such temporal waveforms produce a frequency comb whose spectrum is spread over two widely-spaced spectral windows, each exhibiting a squared hyperbolic secant envelope, with the two windows phase-locked to each other via Cherenkov radiation...
June 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29905678/cherenkov-radiation-from-1550-nm-pumping-in-tapered-photonic-crystal-fibers
#3
Jesper Lægsgaard
The generation of Cherenkov radiation from soliton compression of 1550 nm pulses in tapered photonic crystal fibers is analyzed numerically, with a view to generating short-wavelength-tunable output pulses in the visible range. It is shown that low-noise femtosecond light sources with spectral power densities approaching those of existing supercontinuum sources are feasible with existing fiber laser and tapering technology.
June 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29890773/experimental-demonstration-of-low-uncertainty-calibration-methods-for-bragg-grating-interrogators
#4
José Luis de Miguel, Juan Galindo-Santos, Concepción Pulido de Torres, Pedro Salgado, Aitor V Velasco, Pedro Corredera
In this paper we propose and demonstrate two alternative methods for the high-precision calibration of fiber Bragg grating (FBG) interrogators. The first method is based on the direct comparison between the wavelength measurements of the interrogator under test and a calibrated wavemeter, while analyzing a simulated symmetric Bragg grating constructed by a tunable filter and a fiber mirror. This first method is applicable to most commercial systems but presents an uncertainty limited by the spectral width and the wavelength stability of the tunable filter...
June 10, 2018: Sensors
https://www.readbyqxmd.com/read/29877484/high-power-generation-of-thz-from-1550-nm-photoconductive-emitters
#5
A Mingardi, W-D Zhang, E R Brown, A D Feldman, T E Harvey, R P Mirin
Two photoconductive emitters - one with a self-complementary square spiral antenna, and the other with a resonant slot antenna - were fabricated on a GaAs epilayer embedded with ErAs quantum dots. Driven with 1550 nm mode-locked lasers, ~117 μW broadband THz power was generated from the device with the spiral antenna, and ~1.2 μW from the device with resonant slot antenna. The optical-to-THz conversion is through extrinsic photoconductivity.
May 28, 2018: Optics Express
https://www.readbyqxmd.com/read/29877434/air-clad-suspended-nanocrystalline-diamond-ridge-waveguides
#6
Aly Abdou, Parashara Panduranga, Jens Richter, Evan L H Thomas, Soumen Mandal, Oliver A Williams, Jeremy Witzens, Maziar P Nezhad
A hybrid group IV ridge waveguide platform is demonstrated, with potential application across the optical spectrum from ultraviolet to the far infrared wavelengths. The waveguides are fabricated by partial etching of sub-micron ridges in a nanocrystalline diamond thin film grown on top of a silicon wafer. To create vertical confinement, the diamond film is locally undercut by exposing the chip to an isotropic fluorine plasma etch via etch holes surrounding the waveguides, resulting in a mechanically stable suspended air-clad waveguide platform...
May 28, 2018: Optics Express
https://www.readbyqxmd.com/read/29877390/scalable-and-reconfigurable-true-time-delay-line-based-on-an-ultra-low-loss-silica-waveguide
#7
Qian Qian Song, Zhe Feng Hu, Kai Xin Chen
A scalable and reconfigurable on-chip optical true time delay line consisting of Mach-Zehnder interferometer (MZI) switches and delay waveguides is proposed and demonstrated with the ultra-low-loss silica waveguide platform. The MZI switches provide the reconfiguration of the light traveling paths and hence different delays. Our proposed structure can be easily scaled to an M bit delay line with a slight increase in dimensions. The footprint of our fabricated 1 bit delay line is 33  mm×13  mm (length×width) and can provide a delay of 6...
June 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29877359/broadband-laser-tuned-whispering-gallery-mode-in-a-micro-structured-fiber-embedded-with-iron-oxide-nanoparticles
#8
Ming Deng, Yufan Wang, LeiGuang Liu, Maoru Qin
A grapefruit microstructured fiber-based resonator embedded with iron oxide nanoparticles is demonstrated in this paper. Due to efficient photon-to-heat conversion and transfer of the magnetic nanoparticles, such a device possesses broadband all-optical wavelength tuning with high sensitivity. Experimental results show that the tuning range and sensitivity can be up to ∼5.32  nm and 0.106 nm/mW, respectively, when pump laser with a wavelength of 1550 nm is injected into the resonator. Moreover, it exhibits other excellent features such as ease of fabrication and excellent repeatability, making it a good candidate for potential applications in the area of optical filtering...
June 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29801287/segmented-waveguide-photodetector-with-90-quantum-efficiency
#9
Qianhuan Yu, Keye Sun, Qinglong Li, Andreas Beling
We demonstrate a novel InGaAsP/InP segmented waveguide photodetector based on directional couplers. By matching the imaginary parts of the propagation constants of the even and odd modes, we designed a photodetector with 6 elements, each with an absorber volume of only 19 μm3 and a bandwidth of 15 GHz, that has an internal quantum efficiency (QE) of 90% at 1550 nm wavelength corresponding to 1.13 A/W.
May 14, 2018: Optics Express
https://www.readbyqxmd.com/read/29799583/treatment-of-burn-scars-in-fitzpatrick-phototype-iii-patients-with-a-combination-of-pulsed-dye-laser-and-non-ablative-fractional-resurfacing-1550-nm-erbium-glass-1927-nm-thulium-laser-devices
#10
Joy Tao, Amanda Champlain, Charles Weddington, Lauren Moy, Rebecca Tung
Introduction: Burn scars cause cosmetic disfigurement and psychosocial distress. We present two Fitzpatrick phototype (FP) III patients with burn scars successfully treated with combination pulsed dye laser (PDL) and non-ablative fractional lasers (NAFL). Case 1: A 30-year-old, FP III woman with a history of a second-degree burn injury to the bilateral arms and legs affecting 30% body surface area (BSA) presented for cosmetic treatment. The patient received three treatments with 595 nm PDL (7 mm, 8 J, 6 ms), six with the 1550 nm erbium:glass laser (30 mJ, 14% density, 4-8 passes) and five with the 1927 nm thulium laser (10 mJ, 30% density, 4-8 passes)...
January 2018: Scars, burns & healing
https://www.readbyqxmd.com/read/29791351/ultrashort-polarization-beam-splitter-based-on-liquid-filled-dual-core-photonic-crystal-fiber
#11
Jianshuai Wang, Li Pei, Sijun Weng, Liangying Wu, Jing Li, Tigang Ning
An ultrashort polarization beam splitter (PBS) is proposed based on liquid-filled dual-core photonic crystal fiber (DCPCF). The two cores of DCPCF are formed by two side elliptical holes and a central circular hole in the horizontal direction. The properties of the PBS are analyzed first with a non-filled DCPCF by the finite element method. Then, the performances of the PBS are discussed when the DCPCF is filled with liquids in the central hole. As a result, an ultrashort PBS is realized with a length of 78 μm when glycerol solution with a concentration of 37% is filled in the central hole...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29774924/fluorescence-resonance-energy-transfer-fret-based-nanoparticles-composed-of-aie-luminogens-and-nir-dyes-with-enhanced-three-photon-near-infrared-emission-for-in-vivo-brain-angiography
#12
Wen Liu, Yalun Wang, Xiao Han, Ping Lu, Liang Zhu, Chaowei Sun, Jun Qian, Sailing He
Near-infrared (NIR) fluorescence is very important for high-contrast biological imaging of high-scattering tissues such as brain tissue. Unfortunately, commercial NIR dyes are excited usually by visible light, and their multi-photon absorption (MPA) cross-sections are small. Here, we design new co-encapsulated NIR nanoparticles (NPs) with a large three-photon (3PA) absorption cross-section. A form of aggregation-induced emission (AIE) luminogen (AIEgen), 2,3-bis(4'-(diphenylamino)-[1,1'-biphenyl]-4-yl) fumaronitrile (TPATCN), is introduced as the donor, and a form of NIR dye, silicon 2,3-naphthalocyanine bis-(trihexylsilyloxide) (NIR775), is adopted as the acceptor...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29774600/identification-of-tumor-margins-using-diffuse-reflectance-spectroscopy-with-an-extended-wavelength-spectrum-in-a-porcine-model
#13
U Dahlstrand, R Sheikh, C D Nguyen, J Hult, N Reistad, M Malmsjö
OBJECTIVE: A novel extended-wavelength diffuse reflectance spectroscopy (EWDRS) technique is being developed for future clinical non-invasive tumor margin delineation. In this study, the ability of EWDRS to identify the margins of pigmented skin lesions in an in vivo pig model was evaluated. MATERIALS AND METHODS: Extended-wavelength diffuse reflectance spectroscopy recordings (350-1550 nm) were made on 13 pigmented skin lesions and non-pigmented skin, as a reference...
May 17, 2018: Skin Research and Technology
https://www.readbyqxmd.com/read/29770356/nonvolatile-infrared-memory-in-mos-2-pbs-van-der-waals-heterostructures
#14
Qisheng Wang, Yao Wen, Kaiming Cai, Ruiqing Cheng, Lei Yin, Yu Zhang, Jie Li, Zhenxing Wang, Feng Wang, Fengmei Wang, Tofik Ahmed Shifa, Chao Jiang, Hyunsoo Yang, Jun He
Optoelectronic devices for information storage and processing are at the heart of optical communication technology due to their significant applications in optical recording and computing. The infrared radiations of 850, 1310, and 1550 nm with low energy dissipation in optical fibers are typical optical communication wavebands. However, optoelectronic devices that could convert and store the infrared data into electrical signals, thereby enabling optical data communications, have not yet been realized. We report an infrared memory device using MoS2 /PbS van der Waals heterostructures, in which the infrared pulse intrigues a persistent resistance state that hardly relaxes within our experimental time scales (more than 104 s)...
April 2018: Science Advances
https://www.readbyqxmd.com/read/29761196/three-primary-color-emissions-from-single-multilayered-nanocrystals
#15
Xiumei Yin, Hong Wang, Ying Tian, Mingming Xing, Yao Fu, Xixian Luo
The achievement of three-primary-color luminescence in a single material will lead to revolutionary developments of many advanced applications such as dynamic display with ultra-high resolution, and complex anti-counterfeiting. Here we report the realization of steady-state three-primary-color emission in single multilayered NaYF4 upconversion (UC) nanoparticles. In this core-shell structure, a novel design of a tri-sensitizer, i.e., Nd3+, Yb3+ and Er3+ ions, is utilized, which effectively absorbs the excitation photons of 808, 980 and 1550 nm, and then exhibits blue, red and green emissions, respectively...
May 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/29748920/optically-active-plasmonic-metasurfaces-based-on-the-hybridization-of-in-plane-coupling-and-out-of-plane-coupling
#16
Dong Wu, Liu Yang, Chang Liu, Zenghui Xu, Yumin Liu, Zhongyuan Yu, Li Yu, Lei Chen, Rui Ma, Han Ye
Plasmonic metasurfaces have attracted much attention in recent years owing to many promising prospects of applications such as polarization switching, local electric field enhancement (FE), near-perfect absorption, sensing, slow-light devices, and nanoantennas. However, many problems in these applications, like only gigahertz switching speeds of electro-optical switches, low-quality factor (Q) of plasmonic resonances, and relatively low figure of merit (FOM) of sensing, severely limit the further development of plasmonic metasurface...
May 10, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29716114/bubble-on-fiber-bof-a-built-in-tunable-broadband-acousto-optic-sensor-for-liquid-immersible-in-situ-measurements
#17
Hongsong Xu, Guanyu Wang, Jun Ma, Long Jin, Kyunghwan Oh, Bai-Ou Guan
A new type of tunable broadband fiber-optic acousto-optic sensor was experimentally demonstrated by utilizing a bubble-on-fiber (BoF) interferometer. A single micro-bubble was generated by injecting a heating laser at λ = 980 nm on the metalized facet of an optical fiber. The BoF formed a spherical micro-cavity in water whose acoustic deformation was precisely detected by using a narrowband DFB laser at 1550 nm. The heating light and the interrogating light were fed into a single fiber probe by wavelength division multiplexing (WDM) realizing a small footprint all-fiber configuration...
April 30, 2018: Optics Express
https://www.readbyqxmd.com/read/29716102/high-order-mode-direct-oscillation-of-few-mode-fiber-laser-for-high-quality-cylindrical-vector-beams
#18
Teng Wang, Fan Shi, Yiping Huang, Jianxiang Wen, Zhengqian Luo, Fufei Pang, Tingyun Wang, Xianglong Zeng
Generation of high-order modes with high quality is important for the application of cylindrical vector beams in fibers. We experimentally demonstrated high-order LP11 mode generation and amplification with a broad bandwidth in an all few-mode fiber laser. A wavelength-division-multiplexing (WDM) mode selective coupler (MSC) is proposed to achieve efficient mode conversion from LP01 mode to LP11 mode, but also combine high-order LP11 modes at the wavelengths of 980/1550 nm. To the best of our knowledge, this is the first report on the high-order mode oscillation in an all few-mode fiber laser...
April 30, 2018: Optics Express
https://www.readbyqxmd.com/read/29716082/multimode-and-single-mode-fiber-compatible-graded-index-multicore-fiber-for-high-density-optical-interconnect-application
#19
Yinping Liu, Lin Ma, Chen Yang, Weijun Tong, Zuyuan He
We designed and fabricated a graded-index (GI) multicore fiber (MCF) compatible with both standard multimode and single-mode fiber for high density optical interconnect application in large-scale data centers. The proposed fiber supports long-distance multimode transmission at 850 nm as well as quasi-single mode transmission at 1310 nm and 1550 nm. The parameters of the GI-MCF have been optimized to obtain both a small differential mode delay at 850 nm and a small mode field diameter mismatch of less than 0...
April 30, 2018: Optics Express
https://www.readbyqxmd.com/read/29715969/high-performance-gesn-photodetector-and-fin-field-effect-transistor-finfet-on-an-advanced-gesn-on-insulator-platform
#20
Wei Wang, Dian Lei, Yi-Chiau Huang, Kwang Hong Lee, Wan-Khai Loke, Yuan Dong, Shengqiang Xu, Chuan Seng Tan, Hong Wang, Soon-Fatt Yoon, Xiao Gong, Yee-Chia Yeo
We report the first demonstration of high-performance GeSn metal-semiconductor-metal (MSM) photodetector and GeSn p-type fin field-effect transistor (pFinFET) on an advanced GeSn-on-insulator (GeSnOI) platform by complementary metal-oxide-semiconductor (CMOS) compatible processes. The detection range of GeSn photodetector is extended beyond 2 µm, with responsivities of 0.39 and 0.10 A/W at 1550 nm and 2003 nm, respectively. Through the insertion of an ultrathin Al2 O3 Schottky-barrier-enhancement layer, the dark current IDark of the GeSn photodetector is suppressed by more than 2 orders of magnitude...
April 16, 2018: Optics Express
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