Simulation of whispering-gallery mode microsensing in a microfluidic system

Lei Huang, Zhixiong Guo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Label-free detection using a whispering-gallery mode biosensor in a micro fluidic channel is simulated. The analyte transport in the solution is controlled by applied electric potentials and diffusion. The finite element method is employed for solving the charged species transportation equations, the Poisson equation, the equations of conservation of momentum and energy, and the Helmholtz equations for electromagnetic waves. The adsorption process of analyte on the micro resonator surface is monitored by the resonance wavelength shift in the sensor. Shift caused by temperature variation due to Joule heating is found to be negligible compared to that induced by analyte deposition. The deposition induced shifts behave in a manner similar to Langmuir-like adsorption kinetics. A linear correlation between the frequency shift and the analyte concentration in the solution is obtained. The applied voltage is found to affect the adsorption capability; and thus, the sensor sensitivity. Detection of very low concentration to the sub-ppm level using the sensor is demonstrated.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME Summer Heat Transfer Conference 2009, HT2009
Pages185-192
Number of pages8
DOIs
StatePublished - 2009
Event2009 ASME Summer Heat Transfer Conference, HT2009 - San Francisco, CA, United States
Duration: Jul 19 2009Jul 23 2009

Publication series

NameProceedings of the ASME Summer Heat Transfer Conference 2009, HT2009
Volume2

Other

Other2009 ASME Summer Heat Transfer Conference, HT2009
Country/TerritoryUnited States
CitySan Francisco, CA
Period7/19/097/23/09

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

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