期刊
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
卷 17, 期 4, 页码 979-984出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2010.2078491
关键词
Electromagnetic coupling; microresonators; nanotechnology; plasmons
资金
- National Science Foundation (NSF) [ECCS-0601362, EPS-0814361]
- Oklahoma Center for the Advancement of Science and Technology [AR072-066]
- NSF Major Research Instrumentation [0722410]
- Division Of Earth Sciences
- Directorate For Geosciences [0722410] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [0814361] Funding Source: National Science Foundation
We demonstrate a highly localized enhancement of evanescent coupling between a tapered optical fiber and a high-Q dielectric microresonator owing to the resonant evanescent excitation of localized surface plasmons of a gold nanowire placed on the microresonator's surface. This localized enhancement, at 1550 nm, is due to nanowire fragments that are confined to specific regions of the surface. The enhancement (of photon-tunneling probability) is measured by comparing properties of the whispering-gallery modes' throughput dips before and after deposition of the nanowire. The experimental results presented here show coupling enhancement by a factor of 10-700, depending on the position of fiber-microresonator contact in relation to the nanowire. These Au-nanowire-coated microresonators could provide enhanced sensitivity in various types of surface-plasmon-based gas, chemical, and biological-sensing applications within the telecommunication frequency bands.
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