Highly-sensitive high-Q discontinuous slotted photonic crystal nanobeam cavity for gas sensing

P. Saha; C. Prakash; M. Sen

doi:10.1117/12.2512800

4 March 2019 Highly-sensitive high-Q discontinuous slotted photonic crystal nanobeam cavity for gas sensing

P. Saha, C. Prakash, M. Sen

Proceedings Volume 10927, Photonic and Phononic Properties of Engineered Nanostructures IX; 109272B (2019) https://doi.org/10.1117/12.2512800
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

In this paper, a slotted photonic crystal nanobeam cavity (SPCNC) based sensor has been proposed. The design consists of two rows of parabolically tapered holes and a discontinuous periodic slot in between the two rows of holes. The idea behind the discontinuous slot is to confine light tightly in the low refractive index medium of the structure and thereby increase the sensitivity of the sensor. The slot parameters and the radii of the tapered holes are optimized to achieve a very high Q-factor and sensitivity in the order of ~2.1×10⁶ and 512 nm/refractive index unit respectively. Hence, the proposed structure can be considered as an ideal platform for lab-on-chip gas sensors.

Citation Download Citation

P. Saha, C. Prakash, and M. Sen "Highly-sensitive high-Q discontinuous slotted photonic crystal nanobeam cavity for gas sensing", Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 109272B (4 March 2019); https://doi.org/10.1117/12.2512800

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