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4 March 2019 Dark mode plasmonic cavity biosensor (Conference Presentation)
Cheng Li, Mohammad Hosain Teimourpour, Phuong-Diem Nguyen, Lei Chen, Euan McLeod, Judith Su
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Proceedings Volume 10895, Frontiers in Biological Detection: From Nanosensors to Systems XI; 108950D (2019) https://doi.org/10.1117/12.2509157
Event: SPIE BiOS, 2019, San Francisco, California, United States
Abstract
Local field enhancement of plasmonic nanoantennas below the diffraction limit plays an important role in a variety of applications, including surface-enhanced Raman scattering, spontaneous emission enhancement, nanolasing, enhanced nonlinear effects and biosensing. Yet due to the radiation and ohmic loss of these nanocavities, their quality factor (Q) is much smaller than a typical optical microcavity Q factor, such as that of a microsphere or microtoroid. Coupling a nanoantenna to an optical microcavity increases the Q of the hybrid plasmonic-photonic system, however, this dramatically degrades the Q of the original microcavity. Here, we propose a judicious hybridization of a plasmonic dark mode of a gold nanoring and whispering gallery mode (WGM) of a microtoroid. It is shown through finite element simulation that the hybridized WGM and dark mode of the proposed plasmonic gold nanoring solves the aforementioned issues in two ways. First, the small radiation loss of the dark mode minimizes Q degradation and allows the system to maintain its ultra-high Q. Second, the nanoring enhances the field on the microcavity’s surface which in turn increases the interaction between, for example, a biomolecular target and the WGM. We have shown that the proposed system generates larger resonance shifts compared to a microcavity loaded with same volume of conventional linear gold nanoantennas . This results in significant enhancement in the system’s sensitivity. We have repeated the same simulations for different materials and volumes.
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Cheng Li, Mohammad Hosain Teimourpour, Phuong-Diem Nguyen, Lei Chen, Euan McLeod, and Judith Su "Dark mode plasmonic cavity biosensor (Conference Presentation)", Proc. SPIE 10895, Frontiers in Biological Detection: From Nanosensors to Systems XI, 108950D (4 March 2019); https://doi.org/10.1117/12.2509157
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KEYWORDS
Plasmonics
Biosensors
Optical microcavities
Gold
Nanoantennas
Biosensing
Diffraction
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