Characterization of a 3D optrode array for infrared neural stimulation

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Publication Type pre-print
School or College College of Engineering
Department Electrical & Computer Engineering
Creator Blair, Steven
Other Author Abaya, T. V. F.; Diwekar, M.; Tathireddy, P.; Rieth, L.; Clark, G. A.; Solzbacher, F.
Title Characterization of a 3D optrode array for infrared neural stimulation
Date 2012-01-01
Description This paper characterizes the Utah Slant Optrode Array (USOA) as a means to deliver infrared light deep into tissue. An undoped crystalline silicon (100) substrate was used to fabricate 10×10 arrays of optrodes with rows of varying lengths from 0.5mm to 1.5mm on a 400-μm pitch. Light delivery from optical fibers and loss mechanisms through these Si optrodes were characterized, with the primary loss mechanisms being Fresnel reflection, coupling, radiation losses from the tapered shank and total internal reflection in the tips. Transmission at the optrode tips with different optical fiber core diameters and light in-coupling interfaces was investigated. At λ = 1.55μm, the highest optrode transmittance of 34.7%, relative to the optical fiber output power, was obtained with a 50-μm multi-mode fiber butt-coupled to the optrode through an intervening medium of index n = 1.66. Maximum power is directed into the optrodes when using fibers with core diameters of 200μm or less. In addition, the output power varied with the optrode length/taper such that longer and less tapered optrodes exhibited higher light transmission efficiency. Output beam profiles and potential impacts on physiological tests were also examined. Future work is expected to improve USOA efficiency to greater than 64%.
Type Text
Publisher Optical Society of America
Volume 3
Issue 9
First Page 2200
Last Page 2219
Dissertation Institution University of Utah
Language eng
Bibliographic Citation Abaya, T. V. F., Diwekar, M., Blair, S., Tathireddy, P., Rieth, L., Clark, G. A., & Solzbacher, F. (2012). Characterization of a 3D optrode array for infrared neural stimulation. Biomedical Optics Express, 3(9), 2200-19.
Rights Management (c) Optical Society of America
Format Medium application/pdf
Format Extent 1,837,208 bytes
Identifier uspace,17995
ARK ark:/87278/s6r7901m
Setname ir_uspace
Date Created 2012-11-13
Date Modified 2021-05-06
ID 708215
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