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Resonant Cavity Imaging: A Means Toward High-Throughput Label-Free Protein Detection
Content Provider | Semantic Scholar |
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Author | Bergstein, D. A. Ozkumur, Emre Yaln, Abdussamed Colson, J. R. Needham, J. W. Irani, R. Gershoni, J. M. Goldberg, B. B. DeLisi, Charles Ruane, M. F. Unlu, M. |
Copyright Year | 2008 |
Abstract | The resonant cavity imaging biosensor (RCIB) is an optical technique for detecting molecular binding interactions label free at many locations in parallel that employs an optical resonant cavity for high sensitivity. Near-infrared light centered at 1512.5 nm couples resonantly through a Fabry-Perot cavity constructed from dielectric reflectors (Si/SiO2), one of which serves as the binding surface. As the wavelength is swept using a tunable laser, a near-infrared digital camera monitors cavity transmittance at each pixel. A wavelength shift in the local resonant response of the optical cavity indicates binding. Positioning the sensing surface with respect to the standing wave pattern of the electric field within the cavity controls the sensitivity with which the presence of bound molecules is detected. Transmitted intensity at thousands of pixel locations is recorded simultaneously in a 10 s, 5 nm scan. An initial proof-of-principle setup has been constructed. A test sample was fabricated with 25,100-mum wide square features, each with a different density of 1-mum square depressions etched 12 nm into the SiO2 surface. The average depth of each etched region was found with 0.05 nm rms precision. In a second test, avidin, bound selectively to biotin conjugated bovine serum albumin, was detected. |
Starting Page | 131 |
Ending Page | 139 |
Page Count | 9 |
File Format | PDF HTM / HTML |
PubMed reference number | 19823593 |
Journal | Medline |
Volume Number | 14 |
Alternate Webpage(s) | http://ultra.bu.edu/papers/2008-JSTQE-bergstein.pdf |
Alternate Webpage(s) | http://nanoscience.bu.edu/papers/2008-JSTQE-bergstein.pdf |
Alternate Webpage(s) | https://doi.org/10.1109/JSTQE.2007.913397 |
Journal | IEEE Journal of Selected Topics in Quantum Electronics |
Language | English |
Access Restriction | Open |
Content Type | Text |
Resource Type | Article |