Optimization of photonic crystal cavity for chemical sensing

被引：71

作者：

Kwon, Soon-Hong ^{[1
]}

Sunner, Thomas ^{[1
]}

Kamp, Martin ^{[1
]}

Forchel, Alfred ^{[1
]}

机构：

[1] Univ Wurzburg, Tech Phys, D-97074 Wurzburg, Germany

来源：

OPTICS EXPRESS | 2008年 / 16卷 / 16期

关键词：

D O I：

10.1364/OE.16.011709

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We optimize photonic crystal cavities for enhancing the sensitivity to environmental changes by finite-difference time-domain method. For the heterostructure cavity created by local modulation of the air hole radius, the resonance shifts due to refractive index change of the background material are investigated. The shifts can be enhanced by reducing the photonic crystal slab thickness or introducing air holes in the cavity. The sensitivity of the thinner slab with central air holes is 310nm/RIU ( refractive index unit). The heterostructure created in the slotted waveguide of thin PhC slab shows better sensitivity of 512nm/RIU owing to strong confinement of electric field in the low-index region. (c) 2008 Optical Society of America.

引用

页码：11709 / 11717

页数：9

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