Split-arc-based metasurface for refractive index sensing applications

Keshav Samrat Modi; Jasleen Kaur; Satya Pratap Singh; Umesh Tiwari; Ravindra Kumar Sinha

doi:10.1117/12.2511114

4 March 2019 Split-arc-based metasurface for refractive index sensing applications

Keshav Samrat Modi, Jasleen Kaur, Satya Pratap Singh, Umesh Tiwari, Ravindra Kumar Sinha

Proceedings Volume 10928, High Contrast Metastructures VIII; 109281V (2019) https://doi.org/10.1117/12.2511114
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

In this paper, we have proposed and numerically investigated an all-dielectric metasurface consisting of a 2-dimensional periodic array of convex facing silicon asymmetric split arcs on the silica substrate. Due to split asymmetric arcs configuration, the structure exhibits Fano resonance at the wavelength of 967 nm. The maximum achieved quality factor (Q-Factor) and the spectral contrast ratio of the Fano resonance are 213.4 and 99.91%, respectively. The proposed metasurface can be used as a refractive index sensor as the resonance wavelength is linearly dependent on the refractive index of the surrounding. With the increase in the refractive index, the resonance wavelength shows the red-shift. We found that the wavelength shift per refractive index unit (RIU) is 250 nm/RIU and the figure of merit of this sensor is 50.

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Keshav Samrat Modi, Jasleen Kaur, Satya Pratap Singh, Umesh Tiwari, and Ravindra Kumar Sinha "Split-arc-based metasurface for refractive index sensing applications", Proc. SPIE 10928, High Contrast Metastructures VIII, 109281V (4 March 2019); https://doi.org/10.1117/12.2511114

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KEYWORDS

Refractive index

Sensors

Metamaterials

Dielectrics

Silicon

Silica

Plasmonics

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