Active Control of Slow Light in a Gain-Assisted Plasmon-Induced Transparency Structure

IEEE Photonics Journal

Jianhua Yang¹  Li Yu¹  Song Yang¹  Xiaokang Song¹  Fang Wu¹ 

[1] State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China;

关键词: Surface plasmons;    MDM waveguide;    plasmon-induced transparency;    gain medium;    slow light;   

DOI  :  10.1109/JPHOT.2017.2720698

来源: DOAJ

【 摘 要 】

Plasmon-induced transparency (PIT) in a compact plasmonic resonator structure, which consists of a metal- dielectric-metal waveguide with an aperture-coupled square cavity and a slot resonator, is investigated theoretically and numerically. We find the transparency window and the delay of slow light in this structure can be controlled at a fixed wavelength by carefully adjusting the geometrical parameters of the aperture-coupled square cavity. By introducing gain medium into the slot resonator, the transmittance and the group index in transparency window both are dramatically enhanced with optically pumping the medium, and the group delay time can reach to 0.93 ps. In addition, triple PIT effects are also achieved by adding another aperture-coupled cavity and slot cavity, and corresponding slow light also can be dynamically tuned. This study paves a new route toward the realization of highly integrated all-optical circuits and networks, especially for ultrafast switches, optical buffers, lasers, and nanosensors.

【 授权许可】

Unknown