Plasmonic ring laser cavity with tiny footprint

Xudong Liu; Feifei Shi; Zhaoyu Zhang

doi:10.1117/12.2004075

14 March 2013 Plasmonic ring laser cavity with tiny footprint

Xudong Liu, Feifei Shi, Zhaoyu Zhang

Proceedings Volume 8619, Physics and Simulation of Optoelectronic Devices XXI; 86191W (2013) https://doi.org/10.1117/12.2004075
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

The authors propose a type of plasmonic ring laser which has the footprint smaller than previous published devices, showing the potential to be a single-mode ultra-compact light source. In this structure, CdS gain medium and Ag substrate are separated by an ultrathin MgF₂ layer. The short distance between high-index CdS material and silver makes photonic modes of CdS ring hybridize with surface plasmon plaritons (SPPs) of the Ag-MgF₂ interface, which leads to strong light confinement in this thin MgF₂ gap region. The surface plasmons of this structure carry high momentum, which leads to strong feedback at the ring boundary by total internal reflection forming whispering gallery like mode. Finite difference time domain (FDTD) method is used to calculate and optimize the plasmonic ring geometry. With a 15 nm thick MgF₂ layer, the ring’s outer and inner radius can be shrunk to 290 nm and 170 nm with quality factors of 70 at the resonant wavelength of 514 nm. We fix ring width and reduce MgF₂ thickness and ring radius to get better confinement. When MgF₂ thickness is 5 nm, the outer and inner radius are set as 310 nm and 190 nm respectively, Q factors can reach 93. Free spectral range (FSR) of the ring is around 45 nm, which shows a good ability to generate single mode signal during a large wavelength range. The circled and confined optical fields can significantly enhance light-matter interactions and getting high Purcell factors.

Citation Download Citation

Xudong Liu, Feifei Shi, and Zhaoyu Zhang "Plasmonic ring laser cavity with tiny footprint", Proc. SPIE 8619, Physics and Simulation of Optoelectronic Devices XXI, 86191W (14 March 2013); https://doi.org/10.1117/12.2004075

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KEYWORDS

Magnesium fluoride

Plasmonics

Cadmium sulfide

Metals

Semiconductor lasers

Silver

Finite-difference time-domain method

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