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Broadband and compact 2-D photonic crystal reflectors with controllable polarization dependence

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9 Author(s)
Boutami, S. ; Lab. d'Electronique, Optoelectronique et Microsyst., Ecole Centrale de Lyon, Ecully, France ; Bakir, B.B. ; Hattori, H. ; Letartre, X.
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Two-dimensional (2-D) compact photonic crystal reflectors on suspended InP membranes were studied under normal incidence. We report the first experimental demonstration of 2-D broadband reflectors (experimental stopband superior to 200 nm, theoretical stopband of 350 nm). They are based on the coupling of free space waves with two slow Bloch modes of the crystal. Moreover, they present a very strong sensitivity of the polarization dependence, when modifying their geometry. A compact (50×50 μm2) demonstrator was realized and characterized, behaving either as a broadband reflector or as a broadband transmitter, depending on the polarization of the incident wave. Experimental results are in good agreement with numerical simulations.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 7 )