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Engineering the filter response of photonic crystal microcavity filters

A. S. Jugessur, P. Pottier, and R. M. De La Rue

Open Access Open Access

Abstract

Compact photonic crystal (PhC) filters will play a vital role in wavelength division multiplexing applications and they could be the stepping stones towards the realisation of dense and multifunctional photonic integrated circuits. Bragg grating concepts are applied to PhC filters to control their response by introducing suitable phase shifts and choosing appropriate locations and magnitudes. Moreover, the variation of the PhC hole size at the input and output regions could offer an extra degree of freedom in tailoring the filter characteristics. The ability to engineer and control the filter response of photonic crystal filters is investigated in this paper.

©2004 Optical Society of America

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Figures (9)
Fig. 1.
Fig. 1. Schematic of PhC holes embedded in semiconductor ridge waveguide operating as a compound PhC microcavity filter.

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Fig. 2.
Fig. 2. Schematic of the PhC filter devices: (a) PhC filter with a single phase shift, (b) PhC filter with two phase shifts, k=0.8, (c) PhC filter with two phase shifts, k=1.

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Fig. 3.
Fig. 3. Computational spectral responses of devices shown in Figs. 2(a)–(c).

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Fig. 4.
Fig. 4. Computational transmission spectra of (a) single cavity, (b) two phase-shifts, (c) two phase-shifts with 23 % hole diameter size reduction.

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Fig. 5.
Fig. 5. Fabricated devices on AlGaAs/GaAs epitaxial layer: (a) 1-D PhC filter with a k value of 1, (b) several periods wide, two phase-shifts PhC filter with reduced hole diameter at input and output regions.

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Fig. 6.
Fig. 6. Experimental wavelength spectrum of 1-D PhC filter with a single phase-shift

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Fig. 7.
Fig. 7. Experimental wavelength spectrum of 1-D PhC filter with two phase shifts, k value of 0.8.

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Fig. 8.
Fig. 8. Experimental wavelength spectrum of 1-D PhC filter with two phase shifts, k value of 1.

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Fig. 9.
Fig. 9. Experimental and computational wavelength spectra of 3 µm PhC filter (a) two phase shifts (b) two phase shifts with 23 % hole diameter size reduction.

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