|
Silicon quantum dot coated microspheres for microfluidic refractive index sensing |
JOSA B, Vol. 30, Issue 1, pp. 51-56 (2013)
http://dx.doi.org/10.1364/JOSAB.30.000051
Enhanced HTML 
Acrobat PDF (698 KB)
Abstract
The electromagnetic resonances of optical microspheres—the so-called whispering gallery modes (WGMs)—can be used for refractometric sensing of surrounding fluids. Microspheres are attractive because they offer high sensitivity and can be utilized with fluorescent dyes or quantum dots. One issue with microspheres, however, is that they are difficult to integrate into microfluidic systems. Here, we develop a microfluidic structure that permits sensing applications using a single microsphere in a capillary. To achieve this, a microsphere formed on the end of a tapered fiber was first coated with fluorescent silicon quantum dots (QDs). The sphere was then inserted into a microcapillary and the fluorescence WGMs were monitored as different fluids were pumped through the channel. The sensitivity and detection limits for this sphere-in-a-capillary device were measured for several different QD film thicknesses and for two different microsphere sizes. Because of the relatively high-visibility mode structure, the sensitivity and detection limit can be defined by Fourier analysis of the free spectral range and WGM spectral shifts.
© 2012 Optical Society of America
OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(230.5750) Optical devices : Resonators
(140.3948) Lasers and laser optics : Microcavity devices
(160.4236) Materials : Nanomaterials
ToC Category:
Materials
History
Original Manuscript: August 28, 2012
Manuscript Accepted: October 10, 2012
Published: December 6, 2012
Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics
Citation
Yanyan Zhi, Torrey Thiessen, and Al Meldrum, "Silicon quantum dot coated microspheres for microfluidic refractive index sensing," J. Opt. Soc. Am. B 30, 51-56 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-1-51
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
Related Journal Articles 
- Diamond nanocrystals hosting single nitrogen-vacancy color centers sorted by photon-correlation near-field microscopy (OL)
- Photoluminescent Characterization of Atomic Diffusion in Core-Shell Nanoparticles (OE)
- Whispering-gallery modes and light emission from a Si-nanocrystal-based single microdisk resonator (OE)
- Directional emission InP/GaInAsP square-resonator microlasers (OL)
- Bio-molecule-conjugated fluorescent organically modified silica nanoparticles as optical probes for cancer cell imaging (OE)
Related Conference Papers
- Effects of Gamma Irradiation on Optical Properties of CdSe/ZnS Colloidal Quantum Dots
- Effects of Gamma Irradiation on Optical Properties of CdSe/ZnS Colloidal Quantum Dots
- Submicron Diameter Micropillar Cavities with High Quality Factor and Ultra-Small Mode Volume
- Submicron Diameter Micropillar Cavities with High Quality Factor and Ultra-Small Mode Volume
- Nanophosphors Based on CdSe/ZnS and CdSe/SiO2Colloidal Quantum Dots for Daylight-Quality White LEDs
« Previous Article | Next Article »
OSA is a member of 