Accession Number : ADA623693


Title :   Ultra High Quality Factor Microtoroid for Chemical and Biomedical Sensing Applications


Descriptive Note : Doctoral thesis


Corporate Author : WASHINGTON UNIV ST LOUIS MO


Personal Author(s) : Kim, Woosung


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a623693.pdf


Report Date : Aug 2013


Pagination or Media Count : 149


Abstract : Optical whispering gallery mode (WGM) microcavities have drawn attentions in various types of sensing, such as chemical- and bio-sensing. Even though various types of microcavity geometries have been investigated, research about on-chip WGM toroidal resonator has been discontinued for the sensing applications in aquatic environment. The strong benefits of the microtoroid are ultra-high-Q and small mode volume leading to high sensitivity to small change of environment, surrounding media refractive index change or light scatterer induced effective refractive index change. By using this ultra high-Q WGM resonator, radius greater than 75nm polystyrene nanoparticle are detected in aquatic environment. In addition to polystyrene nanoparticle sensing, individual synthetic hemozoin crystals are detected and its size is measured. The hemozoin crystal sensing ultimately leads to malaria infection diagnose. A sol-gel method fabricated microlaser, co-work with Lina He, extended the sensing capability, detecting greater than 30nm radius polystyrene nanoparticle. Since the water experiment is challenging and tackling the difficulty is main task, theoretical investigations are performed about WGM resonance quality factor, resonator mode volume, and noise to minimum detectable particle size. The research described in this dissertation will shed light on advanced chemical- and bio-sensor developments.


Descriptors :   *BIOMEDICINE , *INTERACTIONS , *NANOPARTICLES , *WATER , ABSORPTION , BEAM SPLITTING , CHIPS(ELECTRONICS) , DIPOLES , EMISSION , EXCITATION , EXPERIMENTAL DESIGN , FABRICATION , FLUORESCENCE , HIGH SENSITIVITY , LATTICE DYNAMICS , LINEARITY , OPTICAL DETECTION , PARTICLE SIZE , PERFORMANCE(ENGINEERING) , POLARIZATION , REFRACTIVE INDEX , RESONATORS , SENSITIVITY , SOL GEL PROCESSES , THESES


Subject Categories : Electrical and Electronic Equipment
      Optics
      Biomedical Instrumentation and Bioengineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE