Subwavelength silicon disk whispering-gallery-mode microcavities for size-dependent nanoparticles detection in the mid-infrared

Jeffrey Dionne; Harshitha Ashwath; Lyuba Kuznetsova

doi:10.1117/1.OE.56.5.057111

23 May 2017 Subwavelength silicon disk whispering-gallery-mode microcavities for size-dependent nanoparticles detection in the mid-infrared

Jeffrey Dionne, Harshitha Ashwath, Lyuba Kuznetsova

Author Affiliations +

Optical Engineering, Vol. 56, Issue 5, 057111 (May 2017). https://doi.org/10.1117/1.OE.56.5.057111

Abstract

Three-dimensional finite-element-method numerical simulations are used to investigate a size-dependent sensing technique by observing the effects that a spherical nanoparticle had on the frequency resonances of whispering-gallery modes of a subwavelength silicon microdisk. Results show that the observed spectral shift varies significantly (∼2 to 8 nm) for the TM1,2 optical mode with an attached nanoparticle with radii between 150 and 400 nm. This frequency shift size-dependence makes it possible to identify viruses of different sizes by the resonant frequency change in the transmission spectrum in the mid-infrared.

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Jeffrey Dionne, Harshitha Ashwath, and Lyuba Kuznetsova "Subwavelength silicon disk whispering-gallery-mode microcavities for size-dependent nanoparticles detection in the mid-infrared," Optical Engineering 56(5), 057111 (23 May 2017). https://doi.org/10.1117/1.OE.56.5.057111

Received: 21 February 2017; Accepted: 28 April 2017; Published: 23 May 2017

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