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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/17972

Title: Photonic detection and characterization of DNA using sapphire microspheres
Authors: MURIB, Mohammed Sharif
YEAP, Weng Siang
Martens, Daan
Bienstman, Peter
DE CEUNINCK, Ward
VAN GRINSVEN, Bart
Schoening, Michael J.
MICHIELS, Luc
HAENEN, Ken
AMELOOT, Marcel
Serpenguzel, Ali
WAGNER, Patrick
Issue Date: 2014
Publisher: SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
Citation: JOURNAL OF BIOMEDICAL OPTICS, 19 (9)
Abstract: A microcavity-based deoxyribonucleic acid (DNA) optical biosensor is demonstrated for the first time using synthetic sapphire for the optical cavity. Transmitted and elastic scattering intensity at 1510 nm are analyzed from a sapphire microsphere (radius 500 mu m, refractive index 1.77) on an optical fiber half coupler. The 0.43 nm angular mode spacing of the resonances correlates well with the optical size of the sapphire sphere. Probe DNA consisting of a 36-mer fragment was covalently immobilized on a sapphire microsphere and hybridized with a 29-mer target DNA. Whispering gallery modes (WGMs) were monitored before the sapphire was functionalized with DNA and after it was functionalized with single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA). The shift in WGMs from the surface modification with DNA was measured and correlated well with the estimated thickness of the add-on DNA layer. It is shown that ssDNA is more uniformly oriented on the sapphire surface than dsDNA. In addition, it is shown that functionalization of the sapphire spherical surface with DNA does not affect the quality factor (Q approximate to 10(4)) of the sapphire microspheres. The use of sapphire is especially interesting because this material is chemically resilient, biocompatible, and widely used for medical implants. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Notes: [Murib, Mohammed Sharif; Yeap, Weng-Siang; De Ceuninck, Ward; van Grinsven, Bart; Haenen, Ken; Wagner, Patrick] Hasselt Univ, Inst Materiaalonderzoek, B-3590 Diepenbeek, Belgium. [Martens, Daan; Bienstman, Peter] Ghent Univ Informat Technol, Dept Informat Technol, Photon Res Grp, B-9000 Ghent, Belgium. [De Ceuninck, Ward; van Grinsven, Bart; Haenen, Ken; Wagner, Patrick] Interuniv Microelect Ctr Vereniging Zonder Winsto, Div Inst Materiaalonderzoek Microelekt, B-3590 Diepenbeek, Belgium. [Schoening, Michael J.] Aachen Univ Appl Sci, Inst Nano & Biotechnol, D-52428 Julich, Germany. [Michiels, Luc; Ameloot, Marcel] Hasselt Univ, BIOMED, B-3590 Diepenbeek, Belgium. [Serpenguzel, Ali] Koc Univ, Dept Phys, Microphoton Res Lab, TR-34450 Istanbul, Turkey.
URI: http://hdl.handle.net/1942/17972
DOI: 10.1117/1.JBO.19.9.097006
ISI #: 000343874900030
ISSN: 1083-3668
Category: A1
Type: Journal Contribution
Validation: ecoom, 2015
Appears in Collections: Research publications

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