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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 3, Iss. 12 — Dec. 1, 2012
  • pp: 3087–3104

A 3D glass optrode array for optical neural stimulation

T.V.F. Abaya, S. Blair, P. Tathireddy, L. Rieth, and F. Solzbacher  »View Author Affiliations

Biomedical Optics Express, Vol. 3, Issue 12, pp. 3087-3104 (2012)

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This paper presents optical characterization of a first-generation SiO2 optrode array as a set of penetrating waveguides for both optogenetic and infrared (IR) neural stimulation. Fused silica and quartz discs of 3-mm thickness and 50-mm diameter were micromachined to yield 10 × 10 arrays of up to 2-mm long optrodes at a 400-μm pitch; array size, length and spacing may be varied along with the width and tip angle. Light delivery and loss mechanisms through these glass optrodes were characterized. Light in-coupling techniques include using optical fibers and collimated beams. Losses involve Fresnel reflection, coupling, scattering and total internal reflection in the tips. Transmission efficiency was constant in the visible and near-IR range, with the highest value measured as 71% using a 50-μm multi-mode in-coupling fiber butt-coupled to the backplane of the device. Transmittance and output beam profiles of optrodes with different geometries was investigated. Length and tip angle do not affect the amount of output power, but optrode width and tip angle influence the beam size and divergence independently. Finally, array insertion in tissue was performed to demonstrate its robustness for optical access in deep tissue.

© 2012 OSA

OCIS Codes
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(220.4610) Optical design and fabrication : Optical fabrication
(230.7380) Optical devices : Waveguides, channeled

ToC Category:
Novel Light Sources, Optics, and Detectors

Original Manuscript: August 9, 2012
Revised Manuscript: October 18, 2012
Manuscript Accepted: October 23, 2012
Published: November 1, 2012

Virtual Issues
January 29, 2013 Spotlight on Optics

T.V.F. Abaya, S. Blair, P. Tathireddy, L. Rieth, and F. Solzbacher, "A 3D glass optrode array for optical neural stimulation," Biomed. Opt. Express 3, 3087-3104 (2012)

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