Materials, Photonic Devices, and Sensors

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

[+] Author Affiliations
Jeffrey Dionne, Lyuba Kuznetsova

San Diego State University, Department of Physics, San Diego, California, United States

Harshitha Ashwath

San Diego State University, Department of Electrical and Computer Engineering, San Diego, California, United States

Opt. Eng. 56(5), 057111 (May 23, 2017). doi:10.1117/1.OE.56.5.057111
History: Received February 21, 2017; Accepted April 28, 2017
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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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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

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


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