2026-09-21T16:59:06Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/50673 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Bahl, Gaurav Han, Kewen 2014-09-16T17:25:06Z 2014-09-16T17:25:06Z 2014-08 2014-09-16 2014-08 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. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2014-07-24T19:35:11Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Han_Kewen.pdf: 4870962 bytes, checksum: 86fb42df2861e11e6fa3cd369fae9abb (MD5) Made available in DSpace on 2014-09-16T17:25:06Z (GMT). No. of bitstreams: 2 Kewen_Han.pdf: 4870980 bytes, checksum: 543faf340037561e5945836d3eab06ae (MD5) license.txt: 4057 bytes, checksum: 5ea582f68bd02a8aa9b36da23db6e34a (MD5) http://hdl.handle.net/2142/50673 en Copyright 2014 Kewen Han Cavity optomechanics Manufacturing and aerostatic tunability of opto-mechano-fluidic resonator and its application in viscosity sensing text Mechanical Sci & Engineering 1917 Mechanical Engineering 0133 University of Illinois at Urbana-Champaign Thesis M.S. MS:Mechanical Enginerng -UIUC 10KS0133MS