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Optics Letters

Georgiy Tkachenko, Daan Stellinga, Andrei Ruskuc, Mingzhou Chen, Kishan Dholakia, Thomas F Krauss
Contactless manipulation of micron-scale objects in a microfluidic environment is a key ingredient for a range of applications in the biosciences, including sorting, guiding, and analysis of cells and bacteria. Optical forces are powerful for this purpose but, typically, require bulky focusing elements to achieve the appropriate optical field gradients. To this end, realizing the focusing optics in a planar format would be very attractive and conducive to the integration of such microscale devices, either individually or as arrays...
July 15, 2018: Optics Letters
Hui Xie, Min Li, Siqiang Luo, Yang Li, Jia Tan, Yueming Zhou, Wei Cao, Peixiang Lu
We report on the scaling of the photoelectron holography with the laser ellipticity in strong-field atomic ionization. We find that the spacing of the holographic fringe gradually decreases with increasing of the ellipticity. In terms of the strong-field approximation, the scaling of the fringe spacing with the laser ellipticity is explained by the effect of the initial transverse momenta at the tunnel exit. With increasing of the laser ellipticity, a ridge structure arising from forward scattering electrons is observed in the low-energy region of the electron momentum distribution...
July 15, 2018: Optics Letters
Li-Ming Zhao, Yun-Song Zhou, Ai-Hua Wang
A very facile way to obtain multiple interface modes in a one-dimensional photonic crystal heterostructure is proposed in this Letter. We found that the interface modes can be generated by introducing the interfaces, and the number of interface modes equals the number of introduced interfaces. All these interface modes originating from a different geometric Zak phase can create two band branches governed by the two different interfaces. We further find that the two band branches can be renormalized into one band branch with discrete energy levels in the form of sinusoidal function...
July 15, 2018: Optics Letters
Dan Zhao, Mengge Wu, Ruiheng Qin, Junsheng Yu
In this Letter, a transparent organic photodetector (OPD) with a property of ultraviolet sensitivity is demonstrated by using an inverted architecture. A conjugated polymer of ploy [(9,9-bis(3' -(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyl)fluorene)] is introduced to modify the energy level and morphology between ZnO and organic optoelectronic material. As a result, at a wavelength of 350 nm and a bias of -1  V, the photodetectivity of 1012 Jones from both sides of the transparent device is obtained with a working area of 1  cm2 ...
July 15, 2018: Optics Letters
Dorian Oser, Diego Pérez-Galacho, Carlos Alonso-Ramos, Xavier Le Roux, Sébastien Tanzilli, Laurent Vivien, Laurent Labonté, Éric Cassan
Bragg filters stand as key building blocks of the silicon-on-insulator (SOI) photonics platform, allowing the implementation of advanced on-chip signal manipulation. However, achieving narrowband Bragg filters with large rejection levels is often hindered by fabrication constraints and imperfections. Here, we show that the combination of single-side corrugation asymmetry and subwavelength engineering provides a narrowband response with large corrugations, overcoming minimum feature size constraints of conventional Si Bragg filters...
July 15, 2018: Optics Letters
Liu Hailong, Zhang Bing, Gao Tian, Cui Fayi, Wu Xijun
Manipulation of the photoluminescence (PL) of monolayer (ML) molybdenum disulfide (MoS2 ) with metallic plasmonic nanostructures has attracted much more attention for potential applications in optoelectronic devices. However, due to the limitation of resonance wavelength and oxidation properties, gold and silver are not the best selections for manipulating PL of MoS2 . Here, we employ aluminum (Al) disks to tune the PL of ML MoS2 . We have found that PL enhancement reaches the maximum when plasmonic resonances of Al disks overlap with the absorption peaks of ML MoS2 ...
July 15, 2018: Optics Letters
Junqiu Liu, Arslan S Raja, Martin H P Pfeiffer, Clemens Herkommer, Hairun Guo, Michael Zervas, Michael Geiselmann, Tobias J Kippenberg
Efficient light coupling to integrated photonic devices is of key importance to a wide variety of applications. "Inverse nanotapers" are widely used, in which the waveguide width is reduced to match an incident mode. Here, we demonstrate novel "double inverse" tapers, in which we reduce both the waveguide height and width. We demonstrate >45% chip-through coupling efficiency for both the transverse electric and transverse magnetic polarizations in Si3 N4 tapers of >500  nm width, in comparison to regular inverse tapers that necessitate <100  nm width...
July 15, 2018: Optics Letters
Fajun Xiao, Yuxuan Ren, Wuyun Shang, Weiren Zhu, Lei Han, Hua Lu, Ting Mei, Malin Premaratne, Jianlin Zhao
We demonstrate that a highly localized plasmonic dark mode with radial symmetry, termed quadrupole-bonded radial breathing mode, can be used for optically trapping the dielectric nanoparticles. In particular, the annular potential well produced by this dark mode shows a sufficiently large depth to stably trap the 5 nm particles under a relatively low optical power. Our results address the quest for precisely trapping sub-10 nm particles with high yield and pave the way for placing sub-10 nm particles conforming to a specific geometric pattern...
July 15, 2018: Optics Letters
A F Kornev, V P Pokrovskiy, S V Gagarskiy, Ya Yu Fomicheva, P A Gnatyuk, A S Kovyarov
An end-pumped Nd:YAG 946 nm laser with pulse duration of 1.6 ns, output energy of 2.5 mJ, and pulse repetition rate of 50 Hz is described. Such a combination of the parameters achieved has become possible due to the implementation of the cavity-dumping mode.
July 15, 2018: Optics Letters
Richard Lange, Daniel Kolbe
We devise a laser-controlled adaptive optical element that operates intracavity under high-intensity radiation. This element substitutes a conventional mechanically deformable mirror and is free of critical heat-sensitive components and electronics. The deformation mechanism is based on the projection of a continuous-wave control laser onto a specially designed mirror. Mounted to a water-cooled heat sink, the mirror can handle laser radiation beyond 3  MW/cm2 . The properties of the adaptive optical element, including the maximum correctable wavefront pitch of 800 nm, are discussed...
July 15, 2018: Optics Letters
Rongli Guo, Weiguang Zhang, Rong Liu, Cunli Duan, Fan Wang
A two-step dual-wavelength phase imaging method with total variation (TV) regularization in digital holographic microscopy (DHM) is presented. The rough height map is first denoised with TV regularization, and then it is used as a guiding map for accurate phase unwrapping. By combining the principle of dual-wavelength interferometry and TV regularization, the problem of phase unwrapping is converted into a minimization problem that can be efficiently solved with the Split Bregman algorithm. The proposed algorithm allows a synthetic wavelength that can be arbitrarily large in principle to a single wavelength, while the accuracy of the phase map can achieve the same level in single-wavelength DHM...
July 15, 2018: Optics Letters
Rosario Martínez-Herrero, David Maluenda, Ignasi Juvells, Artur Carnicer
In this Letter, we describe the behavior of partially coherent, partially polarized focused vector beams after passing a linear polarizer placed at the focal plane of a high numerical aperture microscope lens. In particular, we develop a mathematical framework for such beams that helps the understanding of the performance of polarizers when interact with non-paraxial beams. The features of the focused field after the polarizer are numerically evaluated for some illustrative examples.
July 15, 2018: Optics Letters
Shuai Wang, Xinyu Fan, Bingxin Xu, Bin Wang, Jiangbing Du, Zuyuan He
In this Letter, we propose a hybrid dual-comb interferometer (DCI) with a free-running mode-locked laser and an electro-optic frequency comb. The mutual coherence of this DCI is achieved by using an injection locking technique without any complicated phase-locking loops or post data processing algorithms. The proposed architecture is validated by resolving more than 10,000 comb lines of 250 MHz spacing with a refresh rate of 500 kHz. This combination of two kinds of optical frequency comb sources is suitable for wideband spectroscopic applications, where moderate spectral resolutions as well as high refresh rates are necessary...
July 15, 2018: Optics Letters
Xue-Bi An, Hong-Wei Li, Zhen-Qiang Yin, Meng-Jun Hu, Wei Huang, Bing-Jie Xu, Shuang Wang, Wei Chen, Guang-Can Guo, Zheng-Fu Han
Random number generation is an important task in modern science. A variety of quantum random number generation protocols have been proposed and realized. These protocols, however, are all based on two parties. Based on the weak measurement technique, we propose and realize a quantum random number generator among three observers. The violation of a double classical dimension witness based on the determinant value is first observed in experiment. With the heralding single-photon source, our experimental setup attains the independent assumption and the dimension assumption, which means our setup is semi-device-independent (DI)...
July 15, 2018: Optics Letters
Purnima Sethi, Rakshitha Kallega, Anubhab Haldar, Shankar Kumar Selvaraja
We demonstrate an ultra-compact waveguide taper on a silicon nitride platform. The proposed taper provides a coupling efficiency of 95% at a length of 19.5 μm in comparison to the standard linear taper of length 50 μm, which connects a 10 μm wide waveguide to a 1 μm wide photonic wire. The taper has a spectral response >75% spanning over 800 nm and resilience to fabrication variations; ±200  nm change in taper and end waveguide width varies transmission by <5%. We experimentally demonstrate taper insertion loss of <0...
July 15, 2018: Optics Letters
Yahong Chen, Andreas Norrman, Sergey A Ponomarenko, Ari T Friberg
We explore electromagnetic coherence lattices in planar polychromatic surface plasmon polariton (SPP) fields. When the SPP constituents are uncorrelated-and thus do not interfere-coherence lattices arise from statistical similarity of the random SPP electromagnetic field. As the SPP correlations become stronger, the coherence lattices fade away, but the lattice structure reemerges in the spectral density of the field. The polarization states of the structured SPP lattice fields are also investigated. Controllable plasmonic coherence and spectral density lattices can find applications in nanophotonics, such as nanoparticle manipulation...
July 15, 2018: Optics Letters
Chris Ceroici, Katherine Latham, Ryan Chee, Ben Greenlay, Quinn Barber, Jeremy A Brown, Roger Zemp
A novel 3D photoacoustic imaging technique is experimentally demonstrated using a 64×64 element bias-sensitive crossed-electrode relaxor array. This technique allows for large 2D arrays to receive across all elements while using minimal channel counts. Hadamard-bias patterns are applied to column electrodes while signals are measured from row electrodes. Photoacoustic signals are measured from a crossed-wire phantom in an intralipid scattering medium. The Hadamard-bias-encoded imaging scheme showed a signal-to-noise (SNR) of 25...
July 15, 2018: Optics Letters
Xinmeng Zhang, Tianshu Wang, Junda Chen, Haifeng Yao
We report on a communication link demonstration in a 1 km simulated atmospheric turbulent channel with a wide-spectral mode-locking fiber laser. Wide-spectral beams are part of the supercontinuum, which is generated from pumping a dispersion-shifted fiber by an active mode-locked fiber laser. In addition, the propagation effects of wide-spectral beams were investigated experimentally in a simulated atmosphere channel. The characteristics of bit error rate and eye pattern before and after turbulence were analyzed, respectively...
July 15, 2018: Optics Letters
Ke Chen, Zhihao Yu, Qingxu Yu, Min Guo, Zhihao Zhao, Chao Qu, Zhenfeng Gong, Yang Yang
We demonstrate a highly sensitive and stable fiber-optic Fabry-Perot cantilever microphone based on fast demodulated white-light interferometry. The cavity length of the low-finesse Fabry-Perot interferometry is absolutely measured by realizing a high-speed demodulation method utilizing a full spectrum, with the advantages of both high resolution and large dynamic range. An acoustic test demonstrates high sensitivities and linear responsivities at frequencies below 2 kHz. The pressure responsivity and the noise-limited minimum detectable acoustic pressure level are measured to be 211...
July 15, 2018: Optics Letters
Chi Li, Changrui Liao, Jia Wang, Zhengyong Li, Ying Wang, Jun He, Zhiyong Bai, Yiping Wang
We demonstrate the microprinting of a novel suspended polymer fiber Bragg grating for high-sensitivity temperature measurements. The proposed sensor was developed using a femtosecond laser-induced multiphoton polymerization technique. The grating was cured in a single-groove silica tube spliced between two single-mode fibers. Its transmission spectrum, mode field, and temperature response were thoroughly investigated. A sensitivity of -220  pm/°C was achieved over a temperature range of 24°C to 40°C, which is meaningful in biosensing applications...
July 15, 2018: Optics Letters
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