中国物理B ›› 2016, Vol. 25 ›› Issue (7): 77301-077301.doi: 10.1088/1674-1056/25/7/077301

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Compact surface plasmon amplifier in nonlinear hybrid waveguide

Shu-shu Wang(王曙曙), Dan-qing Wang(王丹青), Xiao-peng Hu(胡小鹏), Tao Li(李涛), Shi-ning Zhu(祝世宁)   

  1. National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
  • 收稿日期:2016-04-14 出版日期:2016-07-05 发布日期:2016-07-05
  • 通讯作者: Tao Li E-mail:taoli@nju.edu.cn
  • 基金资助:

    Project supported by the National Basic Research Program of China (Grant No. 2012CB921501), the National Natural Science Foundation of China (Grant Nos. 11322439, 11274165, 11321063, and 91321312), the Dengfeng Project B of Nanjing University, China, and the PAPD of Jiangsu Higher Education Institutions, China.

Compact surface plasmon amplifier in nonlinear hybrid waveguide

Shu-shu Wang(王曙曙), Dan-qing Wang(王丹青), Xiao-peng Hu(胡小鹏), Tao Li(李涛), Shi-ning Zhu(祝世宁)   

  1. National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
  • Received:2016-04-14 Online:2016-07-05 Published:2016-07-05
  • Contact: Tao Li E-mail:taoli@nju.edu.cn
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant No. 2012CB921501), the National Natural Science Foundation of China (Grant Nos. 11322439, 11274165, 11321063, and 91321312), the Dengfeng Project B of Nanjing University, China, and the PAPD of Jiangsu Higher Education Institutions, China.

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摘要：

Surface plasmon polariton (SPP), a sub-wavelength surface wave promising for photonic integration, always suffers from the large metallic loss that seriously restricts its practical application. Here, we propose a compact SPP amplifier based on a nonlinear hybrid waveguide (a combination of silver, LiNbO3, and SiO2), where a couple of Bragg gratings are introduced in the waveguide to construct a cavity. This special waveguide is demonstrated to support a highly localized SPP-like hybrid mode and a low loss waveguide-like hybrid mode. To provide a large nonlinear gain, a pumping wave input from the LiNbO3 waveguide is designed to resonate inside the cavity and satisfy the cavity phase matching to fulfill the optical parametric amplification (OPA) of the SPP signal. Proper periods of gratings and the cavity length are chosen to satisfy the impedance matching condition to ensure the high input efficiency of the pump wave from the outside into the cavity. In theoretical calculations, this device demonstrates a high performance in a very compact scheme (～ 3.32 μm) and a much lower pumping power for OPA compared with single-pass pumping. To obtain a comprehensive insight into this cavity OPA, the influences of the pumping power, cavity length, and the initial phase are discussed in detail.

关键词: surface plasmons, optical parametric amplification, waveguides

Abstract:

Surface plasmon polariton (SPP), a sub-wavelength surface wave promising for photonic integration, always suffers from the large metallic loss that seriously restricts its practical application. Here, we propose a compact SPP amplifier based on a nonlinear hybrid waveguide (a combination of silver, LiNbO3, and SiO2), where a couple of Bragg gratings are introduced in the waveguide to construct a cavity. This special waveguide is demonstrated to support a highly localized SPP-like hybrid mode and a low loss waveguide-like hybrid mode. To provide a large nonlinear gain, a pumping wave input from the LiNbO3 waveguide is designed to resonate inside the cavity and satisfy the cavity phase matching to fulfill the optical parametric amplification (OPA) of the SPP signal. Proper periods of gratings and the cavity length are chosen to satisfy the impedance matching condition to ensure the high input efficiency of the pump wave from the outside into the cavity. In theoretical calculations, this device demonstrates a high performance in a very compact scheme (～ 3.32 μm) and a much lower pumping power for OPA compared with single-pass pumping. To obtain a comprehensive insight into this cavity OPA, the influences of the pumping power, cavity length, and the initial phase are discussed in detail.

Key words: surface plasmons, optical parametric amplification, waveguides

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
42.65.Wi (Nonlinear waveguides) 42.82.Et (Waveguides, couplers, and arrays)