2026-09-20T08:53:20Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/44440 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Cunningham, Brian T. Cunningham, Brian T. Choquette, Kent D. Hergenrother, Paul J. Eden, James G. Ge, Chun 2013-05-24T22:16:12Z 2013-05-24T22:16:12Z 2015-05-24T10:01:12Z 2013-05 2013-05-24T22:16:12Z 2013-05 Utilizing a tunable photonic crystal resonant reflector as a mirror of an external cavity laser, we demonstrate a new type of label-free optical biosensor that achieves a high quality factor through the process of stimulated emission, while at the same time providing high sensitivity, large dynamic range and simple detection instrumentation. The photonic crystal is fabricated inexpensively from plastic materials, and its resonant wavelength is tuned by adsorption of biomolecules on its surface. Gain for the lasing process is provided by a semiconductor optical amplifier, resulting in a simple detection instrument that operates by normally incident noncontact illumination of the photonic crystal and direct back-reflection into the amplifier. We demonstrate single-mode, mode-hop-free, biomolecule-induced tuning of the continuous-wave laser wavelength. Because the approach incorporates external optical gain that is separate from the transducer, the device represents a significant advance over previous passive optical resonator biosensors and laser-based biosensors. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-01-10T22:29:16Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Ge_Chun.pdf: 3190111 bytes, checksum: 524afa18a90bf427b67fb512df131cda (MD5) Made available in DSpace on 2013-05-24T22:16:12Z (GMT). No. of bitstreams: 2 Chun_Ge.pdf: 3190111 bytes, checksum: 524afa18a90bf427b67fb512df131cda (MD5) license.txt: 4056 bytes, checksum: 36d896cfc7635d8449ca7416bf6755b7 (MD5) Restriction data tranferred 2014-07-01T11:36:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: 2015-05-24 17:18:31 UTC Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Seth Robbins (srobbins@illinois.edu) on 2013-05-24T22:18:56Z Item is restricted until 2015-05-24T22:18:31Z U of I Only Restriction Lifted for Item 44413 on 2015-05-24T10:01:12Z. http://hdl.handle.net/2142/44440 en Copyright by Chun Ge 2013 All Rights Reserved Laser External cavity laser Optical biosensor photonic crystal External cavity laser label-free biosensor text Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Electr & Computer Eng-UIUC 10KS1200PHD