Role of edge inclination in an optical microdisk resonator for label-free sensing

Sensors
Davide GandolfiLorenzo Pavesi

Abstract

In this paper, we report on the measurement and modeling of enhanced optical refractometric sensors based on whispering gallery modes. The devices under test are optical microresonators made of silicon nitride on silicon oxide, which differ in their sidewall inclination angle. In our approach, these microresonators are vertically coupled to a buried waveguide with the aim of creating integrated and cost-effective devices. Device modeling shows that the optimization of the device is a delicate balance of the resonance quality factor and evanescent field overlap with the surrounding environment to analyze. By numerical simulations, we show that the microdisk thickness is critical to yield a high figure of merit for the sensor and that edge inclination should be kept as high as possible. We also show that bulk-sensing figures of merit as high as 1600 RIU(-1) (refractive index unit) are feasible.

References

Aug 22, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Steven G JohnsonY Fink
Feb 28, 2003·Nature·D K ArmaniK J Vahala
Sep 17, 2007·Optics Express·Vanessa ZamoraBenito Gimeno
Apr 1, 1995·Optics Letters·A SerpengüzelG Griffel
Aug 15, 1988·Applied Optics·W M Yunus, A B Rahman
Mar 31, 2012·Journal of Biophotonics·Laura PasquardiniSilvia Soria
Oct 6, 2012·Optics Express·Fernando Ramiro-ManzanoMher Ghulinyan
Mar 26, 2014·Optics Express·Matthew R ForemanFrank Vollmer

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Citations

Jun 21, 2016·Sensors·Giancarlo C Righini, Silvia Soria
Jun 20, 2017·Advanced Materials·Kevin D HeylmanRandall H Goldsmith

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Methods Mentioned

BETA
AFM
chip
surface plasmon resonance
biosensor
biosensing

Software Mentioned

Comsol Multiphysics

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