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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 1 — Jan. 14, 2013
  • pp: 49–59

Label-free, single-object sensing with a microring resonator: FDTD simulation

Dan T. Nguyen and Robert A. Norwood  »View Author Affiliations

Optics Express, Vol. 21, Issue 1, pp. 49-59 (2013)

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Label-free, single-object sensing with a microring resonator is investigated numerically using the finite difference time-domain (FDTD) method. A pulse with ultra-wide bandwidth that spans over several resonant modes of the ring and of the sensing object is used for simulation, enabling a single-shot simulation of the microring sensing. The FDTD simulation not only can describe the circulation of the light in a whispering-gallery-mode (WGM) microring and multiple interactions between the light and the sensing object, but also other important factors of the sensing system, such as scattering and radiation losses. The FDTD results show that the simulation can yield a resonant shift of the WGM cavity modes. Furthermore, it can also extract eigenmodes of the sensing object, and therefore information from deep inside the object. The simulation method is not only suitable for a single object (single molecule, nano-, micro-scale particle) but can be extended to the problem of multiple objects as well.

© 2013 OSA

OCIS Codes
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(080.1753) Geometric optics : Computation methods
(140.3948) Lasers and laser optics : Microcavity devices
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:

Original Manuscript: September 21, 2012
Revised Manuscript: December 7, 2012
Manuscript Accepted: December 11, 2012
Published: January 2, 2013

Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics

Dan T. Nguyen and Robert A. Norwood, "Label-free, single-object sensing with a microring resonator: FDTD simulation," Opt. Express 21, 49-59 (2013)

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