Date of Award
5-2022
Document Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Electrical Engineering
Committee Chair/Advisor
Dr. Judson D. Ryckman
Committee Member
Dr. William R. Harrell
Committee Member
Dr. Eric G. Johnson
Committee Member
Dr. Igor Luzinov
Abstract
This dissertation uses porous silicon as a material platform to explore novel optical effects in three domains: (i) It studies dispersion engineering in integrated waveguides to achieve high performance group index sensing. With proper design parameters, the sensor waveguides can theoretically achieve 6 times larger group index shift compared to the actual bulk effective refractive index shift. We demonstrate the guided mode confinement factor to be a key parameter in design and implementation of these waveguides. (ii) It explores multicolor laser illumination to experimentally demonstrate perceptually enhanced colorimetric sensing, overcoming the limitations faced by many contemporary colorimetric sensors. Our technique allows our sensor to achieve ~ 7 to 30 times higher sensitivities and ~ 30 to 1000 times lower limits of detection compared to current colorimetric sensors. (iii) It develops a novel imprinting technique to laterally pattern arbitrary refractive index on the porous silicon surface to realize nanoscale flat optical components. We demonstrate and characterize imprinted flat lens arrays and show how myriads of possible applications are to be implemented using this nanoimprinting technique. While the material primarily used in this dissertation is porous silicon, many of the demonstrated techniques are generalizable and can be extended towards other materials of interest to achieve high performance patterning and sensing.
Recommended Citation
Talukdar, Tahmid Hassan, "Porous Silicon Photonics for Label-Free Interferometric Biosensing and Flat Optics" (2022). All Dissertations. 2981.
https://tigerprints.clemson.edu/all_dissertations/2981
Author ORCID Identifier
0000-0002-3664-716X
Included in
Atomic, Molecular and Optical Physics Commons, Biomedical Devices and Instrumentation Commons, Electromagnetics and Photonics Commons, Nanotechnology Fabrication Commons, Optics Commons, Semiconductor and Optical Materials Commons