Low power optical switch based on guided resonance of photonic crystal slab

Abstract

Abstract:

The wavelength and angle dependent optical transmission of two-dimensional photonic crystal slab are calculated using RCWA (Rigorous coupled wave analysis) method. The relationship between guided resonance of spectrum and the band structure of two-dimensional photonic crystal slab is investigated. Based on InP material photonic crystal slab, angle resolved and wavelength resolved optical switches are designed utilizing the characterization of low transmission and high quality factor of guided resonance. These switches operate at the wavelength of 1550nm. It shows that the quality factor of guided resonance mode in the transmission spectrum can reach 10⁵, and achieve an on-off contrast of nearly 100% with the nonlinear refractive index change of 10^-4. As the signal light and pump light couple with the guided resonance modes of photonic crystal slab respectively, the field intensity of pump light is enhanced, and the pump energy is reduced to only 184 fJ. To our knowledge, this is the lowest energy needed for optical switcher.

Key words: photonic crystal, optical switcher, guided resonance, InP, low power

CLC Number:

O431
TN252

CHEN Shuai, WANG Chun-xia, LIU Hong-wei, KAN Qiang, XU Xing-sheng , CHEN Hong-da. Low power optical switch based on guided resonance of photonic crystal slab[J]. J4, 2011, 28(1): 73-81.

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