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 全部栏目  Cheng Li
Shengmei Zhao
摘要 + ：(浏览：18次) | 请注意：下载全文可能需要登录或支付相关费用 It is shown that orbital angular momentum (OAM) is a promising new resource in future classical and quantum communications. However, the separation of OAM modes is still a big challenge. In this paper, we propose a simple and efficient separation method with a radial varying phase. In the method, specific radial varying phases are designed and modulated for different OAM modes. The resultant beam is focused to the spots with different horizontal and vertical positions after a convex lens, when the coordinate transformation, including two optical elements with coordinate transformation phase and correct phase, operates on the received beam. The horizontal position of the spot is determined by the vortex phases, and the vertical position of the spot is dependent on the radial varying phases. The simulation and experimental results show that the proposed method is feasible both for separation of two OAM modes and separation of three OAM modes. The proposed separation method is available in principle for any neighboring OAM modes because the radial varying phase is controlled. Additionally, no extra instruments are introduced, and there is no diffraction and narrowing process limitation for the separation.<录用日期>2017-04-29<上网时间>2017-04-30  PDF全文 (下载：5) Photonics Research ，2017年第5卷第4期 pp.000267 Chung-Yu Lin
Yu-Chieh Chi
Cheng-Ting Tsai
Hsiang-Yu Chen
Gong-Ru Lin
摘要 + ：(浏览：24次) | 请注意：下载全文可能需要登录或支付相关费用 A two-color, laser-diode-based, full-duplex fiber-wired and millimeter-wave (MMW)-wireless orthogonal frequency-division multiplexing (OFDM) transmission link is performed. With modal control on the two-color laser diode, a single-wavelength optical carrier is used as both the downstream and upstream transmitters to replace the dual-mode one with an optical baseband, which effectively suppresses the chromatic dispersion that occurs in fiber. The proposed system demonstrates a carrier-reused, full-duplex 28-GHz MMW dense wavelength division multiplexing passive optical network (DWDM-PON) system, providing OFDM transmission with 54 Gb/s downstream, 36 Gb/s upstream and 16 Gb/s wireless data rates. The single-wavelength optical carrier transmits data from an optical line terminal (OLT) to a remote node (RN) and then transfers into a dual-wavelength carrier for optically heterodyne beating an MMW carrier, which further wirelessly transmits the data to an optical network unit (OUN). In addition, the upstream data is carried by another slave colorless laser diode injection-locked by reusing the downstream carrier without additional data erasing, which avoids the wavelength selection problem that resulted from identifying or addressing upstream and downstream channels. Among three laser transmitters with different cavity lengths, the 600-μm embedded MMW wireless carrier can provide the lowest bit error rate (BER) after 25 km of fiber and 1.6-m free-space transmissions at 16 Gb/s, because its highest external quantum efficiency supports the optimization on self-heterodyne transferring the MMW carrier to enable the low-noise and long-distance wireless transmission.<录用日期>2017-04-20<上网时间>2017-05-02 PDF全文 (下载：5) Photonics Research ，2017年第5卷第4期 pp.000271 Zhengyuan Bai
Guiju Tao
Yuanxin Li
Jin He
Kangpeng Wang
Gaozhong Wang
Xiongwei Jiang
Jun Wang
Werner Blau
Long Zhang
摘要 + ：(浏览：23次) | 请注意：下载全文可能需要登录或支付相关费用 Two-dimensional (2D) periodical Au and indium tin oxide (ITO) nanocomposite arrays have been fabricated based on a self-assembled nanosphere lithography technique. A button-shaped Au nanoparticle was formed on each hollow hemisphere-shaped ITO shell. Importantly, the underlying formation mechanism during the thermal treatment has been thoroughly explored by comparing structures resulting from different deposition conditions in detail. Compared to the Au nanoparticle arrays without ITO shells, the Au/ITO nanocomposite arrays showed a stronger localized surface plasmon resonance effect and higher absorption in the near-infrared (NIR) region, benefiting from the free-electron interaction enhancement between Au and ITO. The nonlinear optical properties were investigated using a modified femtosecond intensity-scan system, and the results demonstrated Au/ITO nanocomposite arrays with a remarkable two-photon absorption saturation effect for femtosecond pulses at 1030 nm. The versatile NIR optical responses indicate the great potential of the elaborately prepared 2D periodical Au/ITO nanocomposite arrays in many applications such as solar cells, photocatalysis, and novel nano optoelectronic devices.<录用日期>2017-04-26<上网时间>2017-04-29 PDF全文 (下载：4) Photonics Research ，2017年第5卷第4期 pp.000280 Xiaolong Dong
Shimin Gao
Jiajun Tian
Yong Yao
摘要 + ：(浏览：22次) | 请注意：下载全文可能需要登录或支付相关费用 Fiber-optic laser–ultrasound generation is being used in an increasing number of applications, including medical diagnosis, material characterization, and structural health monitoring. However, most currently used fiber-optic ultrasonic transducers allow effective ultrasound generation at only a single location, namely, at the fiber tip, although there have been a few limited proposals for achieving multipoint ultrasound generation along the length of a fiber. Here we present a novel fiber-optic ultrasound transducer that uses the core-offset splicing of fibers to effectively generate ultrasound at multiple locations along the fiber. The proposed laser–ultrasonic transducer can produce a balanced-strength signal between ultrasonic generation points by reasonably controlling the offsets of the fibers. The proposed transducer has other outstanding characteristics, including simple fabrication and low cost.<录用日期>2017-05-15<上网时间>2017-05-16 PDF全文 (下载：8) Photonics Research ，2017年第5卷第4期 pp.000287 Ekaterina I. Gacheva
Anatoly K. Poteomkin
Sergey Yu. Mironov
Viktor V. Zelenogorskii
Efim A. Khazanov
Konstantin B. Yushkov
Alexander I. Chizhikov
Vladimir Ya. Molchanov
摘要 + ：(浏览：21次) | 请注意：下载全文可能需要登录或支付相关费用 We report on the design and performance of a fiber laser system with adaptive acousto-optic macropulse control for a novel photocathode laser driver with 3D ellipsoidal pulse shaping. The laser system incorporates a three-stage fiber amplifier with an integrated acousto-optical modulator. A digital electronic control system with feedback combines the functions of the arbitrary micropulse selection and modulation resulting in macropulse envelope profiling. As a benefit, a narrow temporal transparency window of the modulator, comparable to a laser pulse repetition period, effectively improves temporal contrast. In experiments, we demonstrated rectangular laser pulse train profiling at the output of a three-cascade Yb-doped fiber amplifier.<录用日期>2017-04-26<上网时间>2017-05-07 PDF全文 (下载：8) Photonics Research ，2017年第5卷第4期 pp.000293 Xudong Liu
Xuequan Chen
Edward P. J. Parrott
Emma Pickwell-MacPherson
摘要 + ：(浏览：26次) | 请注意：下载全文可能需要登录或支付相关费用 We demonstrate how a metal wire grating can work as a 45° polarization converter, a quarter-wave retarder, and a half-wave retarder over a broadband terahertz range when set up in total internal reflection geometry. Classical electromagnetic theory is applied to understand the mechanism, and equations to calculate the polarization state of reflected light are derived. We use a metal grating with a period of 20 μm and width of 10 μm on a fused silica surface: linearly polarized terahertz light incident from fused silica with a supercritical incident angle of 52° is totally reflected by the metal grating and air. The polarization of the terahertz light is rotated by 45°, 90°, and circularly polarized by simply rotating the wire grating. The performance is achromatic over the measured range of 0.1–0.7 THz and comparable to commercial visible light wave retarders.<录用日期>2017-04-21<上网时间>2017-05-04 PDF全文 (下载：10) Photonics Research ，2017年第5卷第4期 pp.000299 |