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Optics Express

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https://www.readbyqxmd.com/read/28468441/light-management-in-perovskite-solar-cells-and-organic-leds-with-microlens-arrays
#1
Akshit Peer, Rana Biswas, Joong-Mok Park, Ruth Shinar, Joseph Shinar
We demonstrate enhanced absorption in solar cells and enhanced light emission in OLEDs by light interaction with a periodically structured microlens array. We simulate n-i-p perovskite solar cells with a microlens at the air-glass interface, with rigorous scattering matrix simulations. The microlens focuses light in nanoscale regions within the absorber layer enhancing the solar cell. Optimal period of ~700 nm and microlens height of ~800-1000 nm, provides absorption (photocurrent) enhancement of 6% (6.3%)...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468440/anisotropic-tapered-polarization-maintaining-large-mode-area-optical-fibers
#2
V E Ustimchik, J Rissanen, S M Popov, Y K Chamorovskii, S A Nikitov
We demonstrate a novel type of tapered large mode area polarization-maintaining fiber. These birefringent fibers have an elliptical inner cladding and a core diameter that increases adiabatically from 8 µm to 70 µm. The polarization maintaining ability of the fiber samples was investigated by measuring the spatial distribution of polarization beat length by using optical frequency-domain reflectometry. The measurements show a clear correlation between the birefringence and the fiber core size, resulting in a modest 10-15% variation in polarization beat length along the fiber...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468439/homodyne-like-detection-for-coherent-state-discrimination-in-the-presence-of-phase-noise
#3
Matteo Bina, Alessia Allevi, Maria Bondani, Stefano Olivares
We propose a homodyne-like detection scheme involving photon-number-resolving detectors to discriminate between two coherent states affected by either uniform or gaussian phase noise. A proof-of-principle experiment is performed employing two hybrid photodetectors, whose outputs are used in post processing to calculate the shot-by-shot photon-number differences. The performance of the strategy is quantified in terms of the error probability in discriminating the noisy coherent signals as a function of the characteristic noise parameters...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468438/multiphoton-imaging-with-blue-diode-pumped-sesam-modelocked-ti-sapphire-oscillator-generating-5-nj-82-fs-pulses
#4
Andreas Rohrbacher, Omar E Olarte, Vesna Villamaina, Pablo Loza-Alvarez, Bojan Resan
We report a directly blue diode pumped Ti:Sapphire oscillator that generates 5 nJ pulses. This is five times higher pulse energy than previously reported for a directly diode pumped Ti:sapphire laser. With 460 mW of average power at 92 MHz and 82 fs pulses, its peak power reaches 61 kW, also several times higher the value than previously published. Direct diode pumping significantly reduces the complexity and therefore the footprint and the cost of the laser, while SESAM modelocking ensures reliable selfstarting and robust operation...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468437/point-by-point-design-method-for-mixed-surface-type-off-axis-reflective-imaging-systems-with-spherical-aspheric-and-freeform-surfaces
#5
Tongtong Gong, Guofan Jin, Jun Zhu
In this paper, mixed-surface-type optical system is defined as the optical system comprised of various types of surfaces, including spherical, aspheric, and freeform surfaces. A general point-by-point design method for mixed-surface-type systems is proposed. In detail, methods for spherical system design and optical power assignment are proposed during the point-by-point design process. Additionally, three surface evolutions are proposed: from spherical to aspheric surfaces and freeform surfaces, and from aspheric surfaces to freeform surfaces...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468436/residual-interpolation-for-division-of-focal-plane-polarization-image-sensors
#6
Ashfaq Ahmed, Xiaojin Zhao, Viktor Gruev, Junchao Zhang, Amine Bermak
Division of focal plane (DoFP) polarization image sensors capture polarization properties of light at every imaging frame. However, these imaging sensors capture only partial polarization information, resulting in reduced spatial resolution output and a varying instantaneous field of overview (IFoV). Interpolation methods are used to reduce the drawbacks and recover the missing polarization information. In this paper, we propose residual interpolation as an alternative to normal interpolation for division of focal plane polarization image sensors, where the residual is the difference between an observed and a tentatively estimated pixel value...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468435/longitudinal-mode-selection-in-a-delay-line-homogeneously-broadened-oscillator-with-a-fast-saturable-amplifier
#7
Michael Fleyer, Moshe Horowitz
Homogeneously broadened delay-line oscillators such as lasers or optoelectronic oscillators (OEOs) can potentially oscillate in a large number of cavity modes that are supported by their amplifier bandwidth. In a continuous wave operating mode, the oscillating mode is selected between one or few cavity modes that experience the highest small-signal gain. In this manuscript, we show that the oscillation mode of a homogeneously broadened oscillator can be selected from a large number of modes in a frequency region that can be broader than the full width at half maximum of the effective cavity filter...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468434/enhanced-fluorescence-microscopy-with-the-bull-s-eye-plasmonic-chip
#8
Keiko Tawa, Shota Izumi, Chisato Sasakawa, Chie Hosokawa, Mana Toma
A Bull's eye-plasmonic chip composed of concentric circles was applied to enhanced fluorescence microscopy. Among one dimensional (1-D), 2-D, and Bull's eye periodic structures, the Bull's eye-plasmonic chip provided the most enhanced fluorescence intensity under the epi-fluorescence microscope, because incident light through the objective lens with all azimuthal angles can be effectively applied to the surface plasmon resonance- field (excitation field) and the plasmon-enhanced emission was also effectively collected...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468433/limits-on-manipulating-conditional-photon-statistics-via-interference-of-weak-lasers
#9
Kang-Hee Hong, Jisung Jung, Young-Wook Cho, Sang-Wook Han, Sung Moon, Kyunghwan Oh, Yong-Su Kim, Yoon-Ho Kim
Photon anti-bunching, measured via the Hanbury-Brown-Twiss experiment, is one of the key signatures of quantum light and is tied to sub-Poissonian photon number statistics. Recently, it has been reported that photon anti-bunching or conditional sub-Poissonian photon number statistics can be obtained via second-order interference of mutually incoherent weak lasers and heralding based on photon counting [Phys. Rev. A92, 033855 (2015)10.1103/PhysRevA.92.033855; Opt. Express24, 19574 (2016)10.1364/OE.24.019574; https://arxiv...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468432/20-db-net-gain-polarization-insensitive-fiber-optical-parametric-amplifier-with-2-thz-bandwidth
#10
M F C Stephens, V Gordienko, N J Doran
A black-box polarization insensitive fiber optical parametric amplifier (PI-FOPA) is characterized for the first time using a commercial 127 Gb/s polarization-division multiplexed PDM-QPSK transponder within a multiplex of twenty-two equivalent DWDM signals across a 2.3 THz bandwidth portion of the C-band. The PI-FOPA employs a recently demonstrated diversity loop arrangement comprising two lengths of highly nonlinear fiber (HNLF) with the parametric pump being removed after the first HNLF in both directions about the loop...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468431/interleaved-single-carrier-frequency-division-multiplexing-for-optical-interconnects
#11
Ji Zhou, Yaojun Qiao, Jianjun Yu, Jianyang Shi, Qixiang Cheng, Xizi Tang, Mengqi Guo
In this paper, we propose a real-valued interleaved single-carrier frequency-division multiplexing (I-SC-FDM) scheme for intensity-modulation and direct-detection optical interconnects. By simplifying the encoding structure, the computational complexity can be reduced from Nlog<sub>2</sub>N complex multiplications to N complex multiplications. At the complementary cumulative distribution function of 10<sup>-2</sup>, a reduction of 10 dB and 7.5 dB for the peak-to-average power ratio (PAPR) of the I-SC-FDM is achieved than that of orthogonal frequency-division multiplexing modulated with QPSK and 16QAM, respectively, when the subcarrier number is set to 4096...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468430/diode-pumped-nanoparticle-gas-laser-physics-a-preliminary-modeling-study
#12
Xu Yang, Hongyan Wang, Zining Yang, Xiaojun Xu
Nanoparticles are one of the attractive building blocks for nanotechnology and offer new possibilities for novel lasers. The rare earth doped nanoparticle gas laser possesses the great potential in high energy laser (HEL) operation because it inherently combines the advantages of commercial broadband diode pumping and gas flow thermal management. By taking Yb<sup>3+</sup> doped nanoparticle gas laser as the main object, a modified model, which considers some main peculiar characteristics of nanoparticles, is set up and analyzed...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468429/sub-diffraction-limited-fluorescent-patterns-by-tightly-focusing-polarized-femtosecond-vortex-beams-in-a-silver-containing-glass
#13
Eungjang Lee, Yannick Petit, Etienne Brasselet, Thierry Cardinal, Seung-Han Park, Lionel Canioni
We report that the shape and size of fluorescent patterns can be controlled by the focused laser intensity distribution, which depends on irradiation conditions as well as on the spin and orbital angular momenta being carried by light, inducing the formation of silver cluster patterns in a silver-containing zinc phosphate glass. In particular, we demonstrate that sub-diffraction-limited inner structures of fluorescent patterns can be generated by direct laser writing (DLW) with tightly focused femtosecond laser vortex beams as Laguerre-Gauss modes (LG0l) with linear and left-handed circular polarizations...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468428/high-speed-fpga-based-phase-measuring-profilometry-architecture
#14
Guomin Zhan, Hongwei Tang, Kai Zhong, Zhongwei Li, Yusheng Shi, Congjun Wang
This paper proposes a high-speed FPGA architecture for the phase measuring profilometry (PMP) algorithm. The whole PMP algorithm is designed and implemented based on the principle of full-pipeline and parallelism. The results show that the accuracy of the FPGA system is comparable with those of current top-performing software implementations. The FPGA system achieves 3D sharp reconstruction using 12 phase-shifting images and completes in 21 ms with 1024 × 768 pixel resolution. To the best of our knowledge, this is the first fully pipelined architecture for PMP systems, and this makes the PMP system very suitable for high-speed embedded 3D shape measurement applications...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468427/200-fs-mode-locked-erbium-doped-fiber-laser-by-using-mechanically-exfoliated-mos-sub-2-sub-saturable-absorber-onto-d-shaped-optical-fiber
#15
Eduardo J Aiub, David Steinberg, Eunézio A Thoroh de Souza, Lúcia A M Saito
For the first time, we demonstrated the fabrication of mechanically exfoliated molybdenum disulfide (MoS<sub>2</sub>) samples deposited onto a D-shaped optical fiber. The MoS<sub>2</sub> exfoliated flakes were deposited onto a stacked of 1.2 µm PVA (polyvinyl alcohol) and 300 nm PMMA (polymethyl methacrylate) layers and then transferred directly onto a side polished surface of D-shaped optical fiber with polishing length of 17 mm and no distance from the fiber core. The sample exhibited a high polarization performance as a polarizer with relative polarization extinction ratio of 97...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468426/high-quality-factor-photonic-crystal-filter-at-k-%C3%A2-0-and-its-application-for-refractive-index-sensing
#16
Yonghao Liu, Shuling Wang, Deyin Zhao, Weidong Zhou, Yuze Sun
We report here the refractive index (RI) sensing using the singly degenerate high quality factor (Q) modes in photonic crystal slabs (PCS) with the free-space coupled incident beam close to normal incidence. Q values of 3.2x10<sup>4</sup> and 1.8x10<sup>4</sup> were achieved for the fabricated PCS in air and aqueous solution, respectively. A spectral sensitivity (S) of 94.5 nm/RIU and a detection limit (DL) of 3x10<sup>-5</sup> RIU were achieved with our device. Such a high-Q cavity for the singly degenerate mode close to normal incidence is very promising to achieve a lower DL for RI sensing...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468425/improving-the-detection-limit-for-on-chip-photonic-sensors-based-on-subwavelength-grating-racetrack-resonators
#17
Lijun Huang, Hai Yan, Xiaochuan Xu, Swapnajit Chakravarty, Naimei Tang, Huiping Tian, Ray T Chen
Compared to the conventional strip waveguide microring resonators, subwavelength grating (SWG) waveguide microring resonators have better sensitivity and lower detection limit due to the enhanced photon-analyte interaction. As sensors, especially biosensors, are usually used in absorptive ambient environment, it is very challenging to further improve the detection limit of the SWG ring resonator by simply increasing the sensitivity. The high sensitivity resulted from larger mode-analyte overlap also brings significant absorption loss, which deteriorates the quality factor of the resonator...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468424/manipulating-surface-plasmon-polaritons-with-infinitely-anisotropic-metamaterials
#18
Zheping Shao, Yihao Yang, Zuojia Wang, Muhiddeen Yahaya, Bin Zheng, Shahram Dehdashti, Huaping Wang, Hongsheng Chen
Guiding surface states through disorders recently has attracted attention of scientists from diverse backgrounds. In this work, we report a robust method to guide surface plasmon polaritons (SPPs) through arbitrary distorted metal surfaces (a kind of disorder), including slopes, bumps, and sharp corners. Almost total transmissions over a broad frequency range can be achieved by use of infinitely anisotropic metamaterials (IAMs). The SPPs are coupled into and out of the bulk modes in the IAMs, where the bulk modes are routed by altering the principle axis of the IAMs...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468423/three-dimensional-display-optimization-with-measurable-energy-model
#19
Young Ju Jeong, Kyuhwan Choi
3D displays have been developed to provide users with a realistic 3D experience. Although various studies have endeavored to establish design principles for 3D displays, a generalized optimized model does not exist in the literature thus far. These circumstances have led to the manufacture of independently qualified 3D products, but expanding these applications remains a challenge. In this paper, we suggest a measurement model and an optimization method for optimized 3D display design. The proposed optimization can be applied to rotatable 3D displays and various pixel structures...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468422/spectral-wings-of-the-fiber-supercontinuum-and-the-dark-bright-soliton-interaction
#20
C Milián, T Marest, A Kudlinski, D V Skryabin
We present experimental and numerical data on the supercontinuum generation in an optical fiber pumped in the normal dispersion range where the seeded dark and the spontaneously generated bright solitons contribute to the spectral broadening. We report the dispersive radiation arising from the interaction of the bright and dark solitons. This radiation consists of the two weak dispersing pulses that continuously shift their frequencies and shape the short and long wavelength wings of the supercontinuum spectrum...
May 1, 2017: Optics Express
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