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http://dx.doi.org/10.3807/KJOP.2006.17.1.054

Polymeric Waveguide Bio Sensors with Bragg Gratings  

Lee, Jae-Hyun (Nano-bio Photonics Lab, Department of Electronics Engineering, Pusan National University)
Kim, Gyeong-Jo (Nano-bio Photonics Lab, Department of Electronics Engineering, Pusan National University)
Oh, Min-Choel (Nano-bio Photonics Lab, Department of Electronics Engineering, Pusan National University)
Publication Information
Korean Journal of Optics and Photonics / v.17, no.1, 2006 , pp. 54-59 More about this Journal
Abstract
Biophotonic sensors based on polymer waveguide with Bragg reflection grating are demonstrated in this work. Waveguide Bragg reflectors were designed by using the effective index method and the transmission matrix method. The grating pattern was formed by exposing the laser interference pattern on a photoresist. On top of the inverted rib waveguide, the Bragg reflection grating was inscribed by the O2 plasma etching. In order to perform the bio-molecule detection experiment, a calixarene molecule was self-assembled on top of thin Au film deposited on the waveguide Bragg reflector. To measure the response of the sensor, several PBS solutions with different concentrations of potassium ion from 1 pM to $100\;{\mu}M$ were dropped on the sensor surface. The shift of Bragg reflection wavelength was observed from the fabricated sensor device, which was proportional to the concentration of potassium ion ranging from 1 pM to 108 pM.
Keywords
Polymeric optical waveguide; Bragg reflection grating; In-situ measurement; Bio-photonic sensor;
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