11 January 2008 Fine tuning of single row photonic crystal extended cavities embedded in photonic wire waveguides
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Abstract
This paper describes the realization of high quality factor (Q-factor) single row photonic crystal extended cavity structures embedded in 500 nm wide photonic wire waveguides. Cavities spacer lengths of between 2 µm and 9 µm have been inserted between two periodic mirrors with aperiodic tapering of the hole diameter and the spacing between holes. A Q-factor value of approximately 74,000 has been measured for a 5 µm long cavity at a selected resonance frequency. We have also demonstrated experimentally a tuning capability for the resonance frequency by means of small variations of the cavity length. A shift of approximately 10 nm in resonance frequency has been obtained for a 250 nm variation of the cavity length, both in simulation and in measured results. In addition, a free spectral range (FSR) in resonance frequency of between 20 nm and 30 nm has also been demonstrated for a small variation in the mirror hole diameter of approximately 20 nm. Tapering within and outside the cavity has produced a substantial increase in both the Q-factor and the optical transmission at resonance. Both 2D and 3D finite-difference time-domain (FDTD) computations have been used to simulate the device structures. Comparisons between the simulation and measured results show reasonably good agreement.
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Ahmad Rifqi Md Zain, Harold M. H. Chong, Nigel Johnson, Richard M. De La Rue, "Fine tuning of single row photonic crystal extended cavities embedded in photonic wire waveguides", Proc. SPIE 6801, Photonics: Design, Technology, and Packaging III, 68010U (11 January 2008); doi: 10.1117/12.758834; https://doi.org/10.1117/12.758834
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KEYWORDS
Photonic crystals

Waveguides

Finite-difference time-domain method

Silicon

Mirrors

Transmittance

Fabry–Perot interferometers

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