期刊
OPTICAL AND QUANTUM ELECTRONICS
卷 51, 期 10, 页码 -出版社
SPRINGER
DOI: 10.1007/s11082-019-2040-4
关键词
Slotted photonic crystal waveguides; Ring air holes; 3D-PWE; 3D-FDTD; Refractive index sensing
In this paper, the sensitivity of slotted photonic crystal waveguides (SPCW) with triangular lattice pattern of ring-shaped holes is analyzed in order to realize highly refractive index (RI) sensor devices at mid-infrared wavelengths. The sensing principle is based on the shift of the transmission spectrum edge of these specific ring hole SPCW waveguides giving rise to reinforced light-matter interaction. The 3D simulation results applied to silicon waveguides on membrane show that this guide geometry leads to a very high sensitivity to variations in the ambient environment index, with very dependent trends on the opto-geometric factors of the waveguides. As a matter of example, a 720 nm wavelength position band edge shift is predicted, corresponding to a sensitivity of more than 1450 nm per refractive index unit with a device insertion loss level of - 3 dB.
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