University of Illinois Urbana-Champaign

Manufacturing and aerostatic tunability of opto-mechano-fluidic resonator and its application in viscosity sensing

Han, Kewen

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Kewen_Han.pdf

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https://hdl.handle.net/2142/50673

Description

Title
Manufacturing and aerostatic tunability of opto-mechano-fluidic resonator and its application in viscosity sensing
Author(s)
Han, Kewen
Issue Date
2014-09-16
Director of Research (if dissertation) or Advisor (if thesis)
Bahl, Gaurav
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2014-09-16T17:25:06Z
Keyword(s)
Cavity optomechanics
Abstract
Cavity optomechanics experiments parametrically couple the phonon modes and photon modes in microresonators and various optical systems have been investigated. However, because of the increased acoustic radiative losses during direct liquid immersion of optomechanical devices, almost all published optomechanical experiments have been performed in solid phase. The high acoustic losses during direct liquid immersion limits the biosensing applications of optomechanical devices. This thesis discusses a recently introduced hollow opto-mechano-fluidic resonator (OMFR), which by design are equipped for microfluidic experiments. By confining liquids inside the capillary resonator, high mechanical- and optical- quality factors are simultaneously maintained. Unlike optofluidics biosensing, because the optical modes don't interact with the liquids directly, the optomechanical biosensing doesn't have any requirement of the optical properties of the fluids and bioanalytes. Detailed methodology is provided to fabricate these ultra-high-Q microfluidic resonators, perform optomechanical testing, and measure radiation pressure-driven breathing mode (10--20 MHz) and SBS-driven (10--12 GHz) whispering gallery mode vibrations. We also experimentally investigate aerostatic tuning of these hollow-shell oscillators, enabled by geometry, stress, and temperature effects. We demonstrate for the first time the simultaneous actuation of RP-induced breathing mechanical modes and SBS-induced whispering gallery acoustic modes, through a single pump laser. In addition, we show that fluid viscosity can also be determined through optomechanical measurement of the vibrational noise spectrum of the resonator mechanical modes. A linear relationship between the spectral linewidth and root-viscosity is predicted and experimentally verified in the low viscosity regime. Our result is a step towards completely self-referenced optomechanical sensor technologies and multi-frequency measurement of viscoelasticity of arbitrary fluids and bioanalytes, without sample contamination, using highly sensitive optomechanics techniques.
Graduation Semester
2014-08
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http://hdl.handle.net/2142/50673
Copyright and License Information
Copyright 2014 Kewen Han

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