Investigation of feedback characteristics in single planar waveguide-coupled square microcavity by FDTD technique

Guoping Lin; Le Ma; Benrui Zheng; Huiying Xu; Zhiping Cai

doi:10.1117/12.752523

5 February 2008 Investigation of feedback characteristics in single planar waveguide-coupled square microcavity by FDTD technique

Guoping Lin, Le Ma, Benrui Zheng, Huiying Xu, Zhiping Cai

Author Affiliations +

Proceedings Volume 6838, Optoelectronic Devices and Integration II; 68381D (2008) https://doi.org/10.1117/12.752523
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Feedback characteristics in single planar waveguide-coupled square microcavity are investigated by using the two-dimensional finite-difference time-domain method. A square microcavity with refractive index of 3.5 and side length of 2.2μm plays as a wavelength selective feedback element, and a single planar waveguide with width of 0.2μm is used to input and output light in the simulation. Simulation results show that most of the on-resonance extinction in transmitted optical power through the planar waveguide can be reflected. The highest reflection observed is more than 92% of the incident power at the resonance wavelength. For better understanding the high reflection phenomenon, the steady field patterns of single waveguide coupled square microcavity has also been obtained. The influence of coupling gap between the cavity and waveguide, on the resonance wavelength, reflection efficiency and the linewidth of reflection peak has been studied. With increasing gap, the resonance position shifts to the longer wavelength, and the linewidth narrows. The results also show that an optimized gap exits for the highest optical power reflection.

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Guoping Lin, Le Ma, Benrui Zheng, Huiying Xu, and Zhiping Cai "Investigation of feedback characteristics in single planar waveguide-coupled square microcavity by FDTD technique", Proc. SPIE 6838, Optoelectronic Devices and Integration II, 68381D (5 February 2008); https://doi.org/10.1117/12.752523

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KEYWORDS

Optical microcavities

Waveguides

Planar waveguides

Finite-difference time-domain method

Refractive index

Continuous wave operation

Integrated optics

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