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Realizing micro- and nano-optical bio sensors on chip
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Paper Abstract

Si LEDs that operate in the reverse avalanche mode (Si AM LED) and forward bias (Si FB LED), offer various possibilities for realizing nano and micro biosensors directly on chip. The LEDs operate in 450 - 1100nm wavelength range, can emit up to 100nW of optical power, and can be fabricated in micro and nano dimensions. The dispersion characteristics has been studied for a Si AM LED source that is positioned one micron below silicon surface. Subsequently, a fluidic channel sensor device has been designed using the dispersion characteristics. Hence transmittance and absorption spectra studies of species that flow in a fluidic channel can be studied. Similarly, a waveguide-based sensor device has been designed where a receptor layer is fabricated on a waveguide on chip between a Si AM LED and a Si p-i-n detector. The receptor layer binds preferentially with a defined pathogen, and couples with the evanescent radiation of the waveguide.

Paper Details

Date Published: 24 January 2019
PDF: 12 pages
Proc. SPIE 11043, Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, 1104308 (24 January 2019); doi: 10.1117/12.2502491
Show Author Affiliations
Timothy A. Okhai, Tshwane Univ. of Technology (South Africa)
Lukas W. Snyman, Univ. of South Africa (South Africa)

Published in SPIE Proceedings Vol. 11043:
Fifth Conference on Sensors, MEMS, and Electro-Optic Systems
Monuko du Plessis, Editor(s)

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