Light-directed functionalization methods for high-resolution optical fiber based biosensors

Leyla Nesrin Kahyaoglu; Rajtarun Madangopal; Matthew Stensberg; Jenna L. Rickus

doi:10.1117/12.2177178

13 May 2015 Light-directed functionalization methods for high-resolution optical fiber based biosensors

Leyla Nesrin Kahyaoglu, Rajtarun Madangopal, Matthew Stensberg, Jenna L. Rickus

Proceedings Volume 9486, Advanced Environmental, Chemical, and Biological Sensing Technologies XII; 948605 (2015) https://doi.org/10.1117/12.2177178
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

Recent advances in miniaturization and analyte-sensitive fluorescent indicators make optical fiber biosensors promising alternatives to microelectrodes. Optical sensing offers several advantages over electrochemical methods including increased stability and better spatial control to monitor physiological processes at cellular resolutions. The distal end of an optical fiber can be functionalized with different fluorophore/polymer combinations through mechanical, dip-coating or photopolymerization techniques. Unlike mechanical and dip-coating schemes, photopolymerization can spatially confine the sensing layer in the vicinity of light in a more reproducible and controllable manner. The objective of this study was to fabricate microscale fluorescence lifetime based optrodes using UV-induced photopolymerization. Six commercially available acrylate based monomers were investigated for stable entrapment of the oxygen sensitive porphyrin dye (PtTFPP) dye via photopolymerization at the end of optical fibers. Of these, the acrylate-functionalized alkoxysilane monomer, 3-methacryloxypropyl-trimethoxysilane (tradename Dynasylan MEMO) showed maximal response to changes in oxygen concentration. Dye-doped polymer microtips were grown at the ends 50 μm optical fibers and sensitivity and response time were optimized by varying both the concentration of doped dye and the excitation power used for polymerization. The resulting sensors showed linear response within the physiologically relevant range of oxygen concentrations and fast response times. While applied here to oxygen sensing, the photopolymer formulation and process parameters described are compatible with a wide range of available organic dyes and can be used to pattern arrays of spots, needles or more complex shapes at high spatial resolution.

Citation Download Citation

Leyla Nesrin Kahyaoglu, Rajtarun Madangopal, Matthew Stensberg, and Jenna L. Rickus "Light-directed functionalization methods for high-resolution optical fiber based biosensors", Proc. SPIE 9486, Advanced Environmental, Chemical, and Biological Sensing Technologies XII, 948605 (13 May 2015); https://doi.org/10.1117/12.2177178

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available