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Title:Porous photonic crystal external cavity laser biosensor
Author(s):Huang, Qinglan
Advisor(s):Cunningham, Brian T.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Photonic crystal
Label-free biosensor
External cavity laser
Abstract:We report the design, fabrication, and testing of a photonic crystal (PhC) biosensor structure that incorporates a porous high refractive index TiO2 dielectric film that enables immobilization of capture proteins within an enhanced surface-area volume that spatially overlaps with the regions of resonant electromagnetic fields where biomolecular binding can produce the greatest shifts in photonic crystal resonant wavelength. Despite the nanoscale porosity of the sensor structure, the PhC slab exhibits narrowband and high efficiency resonant reflection, enabling the structure to serve as a wavelength tunable element of an external cavity laser. In the context of sensing small molecule interactions with much larger immobilized proteins, we demonstrate that the porous structure provides 3.7x larger biosensor signals than an equivalent nonporous structure, while the external cavity laser (ECL) detection method provides capability for sensing picometer-scale shifts in the PhC resonant wavelength caused by small molecule binding. The porous ECL achieves a record high figure of merit for label-free optical biosensors.
Issue Date:2017-04-24
Rights Information:Copyright 2017 Qinglan Huang
Date Available in IDEALS:2017-08-10
Date Deposited:2017-05

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