Optics Express
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#1Yeongyu Choi (PNU: Pusan National University)H-Index: 7
#2Seung-Won Oh (PNU: Pusan National University)H-Index: 11
Last. Tae-Hoon Yoon (PNU: Pusan National University)H-Index: 27
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The optical performance of an asymmetrically surface-anchored liquid crystal (LC) cell driven with three-terminal electrodes is demonstrated. The transmittance of an asymmetrically anchored cell is considerably higher than that of a symmetrically anchored cell. However, the slow response of an asymmetrically anchored cell makes its practical application difficult. In this work, we demonstrate that the slowest GTG response time from a high to low grey level in an asymmetrically anchored cell can ...
#1Daiki Okazaki (UTokyo: University of Tokyo)H-Index: 1
#2Ikki Morichika (UTokyo: University of Tokyo)H-Index: 3
Last. Satoshi Ashihara (UTokyo: University of Tokyo)H-Index: 15
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We study the saturable absorption properties of single-walled carbon nanotubes (SWCNTs) with a large diameter of 2.2 nm and the corresponding exciton resonance at a wavelength of 2.4 µm. At resonant excitation, a large modulation depth of approximately 30 % and a small saturation fluence of a few tens of µJ/cm2 are evaluated. The temporal response is characterized by an instantaneous rise and a subpicosecond recovery. We also utilize the SWCNTs to realize sub-50 fs, self-start mode locking in a ...
#1Zhangweiyi Liu (SJTU: Shanghai Jiao Tong University)H-Index: 6
#2Weilin Xie (BIT: Beijing Institute of Technology)H-Index: 2
Last. Yi DongH-Index: 13
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We establish an analytical model for the stable dissemination of radio-frequency (RF) signals via fiber-optic links. Based on the phase-locked loop theory, the contributions from the photonic RF source, transmission-path, and additional system noise have been taken into account, leading to the quantitative analysis of the phase noise evolution in the transmission link. Furthermore, the theoretical analysis reveals the relation between the system instability and the frequency of the transmitted s...
#1Lauren Gingras (U of O: University of Ottawa)
#2Ahmed Jaber (U of O: University of Ottawa)
Last. Jean-Michel Ménard (U of O: University of Ottawa)H-Index: 12
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We demonstrate ultrafast tuning of a plasmonic spectral filter at terahertz (THz) frequencies. The device is made of periodically spaced gold crosses deposited on the surface of an undoped silicon wafer in which transient free carriers can be optically injected with a femtosecond resonant pulse. We demonstrate the concept by measuring the transmission spectrum of a notch filter using time-domain THz spectroscopy. Proper synchronization of the THz probe and visible excitation pulses leads to an e...
#1Di Xu (The Institute of Optics)H-Index: 2
#2Andres Garcia Coleto (The Institute of Optics)
Last. Jannick P. Rolland (The Institute of Optics)H-Index: 45
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Significant advances for optical systems in terms of both performance and packaging are enabled by freeform optical components. Yet, surface form metrology for freeform optics remains a challenge. We developed and investigated a point-cloud cascade optical coherence tomography (C-OCT) technique to address this metrology challenge. The mathematical framework for the working principle of C-OCT is presented. A novel detection scheme is developed to enable high-speed measurements. Experimental resul...
#1Ihsan Fsaifes (École Polytechnique)H-Index: 8
#1Ihsan FsaifesH-Index: 2
Last. Jean-Christophe Chanteloup (École Polytechnique)H-Index: 8
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We report on the coherent beam combining of 61 femtosecond fiber chirped-pulse amplifiers in a tiled-aperture configuration along with an interferometric phase measurement technique. Relying on coherent beam recombination in the far field, this technique appears suitable for the combination of a large number of fiber amplifiers. The 61 output beams are stacked in a hexagonal arrangement and collimated through a high fill factor hexagonal micro-lens array. The residual phase error between two fib...
#1Jens Bauer (UCI: University of California, Irvine)H-Index: 11
#2Anna Guell Izard (UCI: University of California, Irvine)H-Index: 4
Last. Lorenzo Valdevit (UCI: University of California, Irvine)H-Index: 20
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Two-photon polymerization direct laser writing (TPP-DLW) is one of the most versatile technologies to additively manufacture complex parts with nanoscale resolution. However, the wide range of mechanical properties that results from the chosen combination of multiple process parameters imposes an obstacle to its widespread use. Here we introduce a thermal post-curing route as an effective and simple method to increase the mechanical properties of acrylate-based TPP-DLW-derived parts by 20-250% a...
#1De Zhou (HUST: Huazhong University of Science and Technology)H-Index: 2
#2Guanyu Chen (HUST: Huazhong University of Science and Technology)H-Index: 10
Last. Yu Yu (HUST: Huazhong University of Science and Technology)H-Index: 19
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The bandwidth and saturation power of germanium photodetectors are two crucial parameters for implementing analog and microwave photonics circuits. In conventional schemes, it is hard to optimize these two parameters simultaneously, due to different requirements for the size of absorption region. We report the design and demonstration of a high-power and high-speed germanium photodetector with distributed absorption regions. In this distributed-absorption photodetector (DAPD), the junction is fo...
#1L.P. StoevelaarH-Index: 1
Last. Giampiero GeriniH-Index: 20
view all 11 authors...
We present a planar spectro-polarimeter based on Fabry-Perot cavities with embedded polarization-sensitive high-index nanostructures. A 7 µm-thick spectro-polarimetric system for 3 spectral bands and 2 linear polarization states is experimentally demonstrated. Furthermore, an optimal design is theoretically proposed, estimating that a system with a bandwidth of 127 nm and a spectral resolution of 1 nm is able to reconstruct the first three Stokes parameters with a signal-to-noise ratio of -13.14...
#1Tonglu Xing (Jiangnan University)
#2Tairong Bai (Jiangnan University)
Last. Jicheng Wang (Jiangnan University)H-Index: 14
view all 7 authors...
A device incorporating a series of periscope-like waveguides to achieve bidirectional focusing and plasmon launching is proposed. Optimizing the number, positions, and dimensions of the waveguides and tuning the waveguide optical paths both produce the required phase shifts to shape wavefronts and achieve constructive interference at the desired points. Due to the symmetry and reversibility of the structure, the lens can focus the light incident on both sides. Energy redistribution to a specific...
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