Share Email Print

Proceedings Paper

Optical biosensor based on silicon nanowire ridge waveguide
Author(s): Rania Gamal; Yehia Ismail; Mohamed A. Swillam
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Optical biosensors present themselves as an attractive solution for integration with the ever-trending lab-on-a-chip devices. This is due to their small size, CMOS compatibility, and invariance to electromagnetic interference. Despite their many benefits, typical optical biosensors rely on evanescent field detection, where only a small portion of the light interacts with the analyte. We propose to use a silicon nanowire ridge waveguide (SNRW) for optical biosensing. This structure is comprised of an array of silicon nanowires, with the envelope of a ridge, on an insulator substrate. The SNRW maximizes the overlap between the analyte and the incident light wave by introducing voids to the otherwise bulk structure, and strengthens the contribution of the material under test to the overall modal effective index will greatly augment the sensitivity. Additionally, the SNRW provides a fabrication convenience as it covers the entire substrate, ensuring that the etching process would not damage the substrate. FDTD simulations were conducted and showed that the percentage change in the effective index due to a 1% change in the surrounding environment was more than 170 times the amount of change perceived in an evanescent detection based bulk silicon ridge waveguide.

Paper Details

Date Published: 27 February 2015
PDF: 5 pages
Proc. SPIE 9371, Photonic and Phononic Properties of Engineered Nanostructures V, 93711U (27 February 2015); doi: 10.1117/12.2078398
Show Author Affiliations
Rania Gamal, The American Univ. in Cairo (Egypt)
Zewail City of Science and Technology (Egypt)
Yehia Ismail, The American Univ. in Cairo (Egypt)
Zewail City of Science and technology (Egypt)
Mohamed A. Swillam, The American Univ. in Cairo (Egypt)

Published in SPIE Proceedings Vol. 9371:
Photonic and Phononic Properties of Engineered Nanostructures V
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?