Photonic molecules for improving the optical response of macroporous silicon photonic crystals for gas sensing purposes

Optics Express
D CardadorAngel Rodriguez

Abstract

In this paper, we report the benefits of working with photonic molecules in macroporous silicon photonic crystals. In particular, we theoretically and experimentally demonstrate that the optical properties of a resonant peak produced by a single photonic atom of 2.6 µm wide can be sequentially improved if a second and a third cavity of the same length are introduced in the structure. As a consequence of that, the base of the peak is reduced from 500 nm to 100 nm, while its amplitude remains constant, increasing its Q-factor from its initial value of 25 up to 175. In addition, the bandgap is enlarged almost twice and the noise within it is mostly eliminated. In this study we also provide a way of reducing the amplitude of one or two peaks, depending whether we are in the two- or three-cavity case, by modifying the length of the involved photonic molecules so that the remainder can be used to measure gas by spectroscopic methods.

References

Aug 15, 2003·Nature·Kerry J Vahala
Apr 19, 2011·Optics Letters·M BenyoucefO G Schmidt
Jun 28, 2013·Nature·Yasushi TakahashiSusumu Noda
Dec 24, 2014·Reports on Progress in Physics·P Törmä, W L Barnes
Mar 24, 2017·Light, Science & Applications·Tobias SiegleHeinz Kalt

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