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High-Q plasmonic bottle microresonators

High-Q plasmonic bottle microresonators
High-Q plasmonic bottle microresonators
Surface Plasmon Waves (SPWs) supported by thin metal films have been used to implement high performance surface sensitive devices, such as refractometric and biochemical sensors. Recently all-glass bottle microresonators (BMRs), supporting whispering-gallery modes (WGM), have been studied in-depth with the intention to be used in advanced photonic applications, such as CQED, nonlinear devices and miniaturized sensors. In this work, we combine the two structures and demonstrate the first hybrid plasmonic BMR (PBMR). A gold layer has been deposited on the top surface of a glass BMR, fabricated by the “soften-and-compress” technique. We developed a polarization-resolving measurement set-up to fully characterize fabricated PBMRs. The uncoated BMR had 181µm waist diameter, 125µm stem diameter and 400µm length. Due to the surface curvature the gold film covered only the top BMR half with a characteristic meniscus shape with maximum thickness of 30nm. The meniscus provides appropriately tapered edges, which facilitate the adiabatic transformation of BMR WGMs into SPW and vice-versa. This results in low transition losses, which combined with partially-metal-coated resonator, can result in high hybrid-PBMR Qs.
The transmission spectra of the hybrid PBMR are dramatically different to the original uncoated BMR. Under TE(TM) excitation, the PBMR showed composite resonances with Q of ~2100(850) and almost identical ~3nm FSR. We have accurately fitted the observed transmission resonances with Lorentzian-shape curves and showed that the TE/TM composite resonances comprise two/three partially overlapping resonances with Qs in excess of 2900 and 2500, respectively. These are the highest Qs observed in plasmonic microcavities.
Mohd Nasir, M.N.
f44744b8-8eb9-4051-b871-0eabda932d37
Ding, M.
12b31750-03c4-4f76-aab6-64feb8f13bf0
Murugan, G.S.
a867686e-0535-46cc-ad85-c2342086b25b
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Mohd Nasir, M.N.
f44744b8-8eb9-4051-b871-0eabda932d37
Ding, M.
12b31750-03c4-4f76-aab6-64feb8f13bf0
Murugan, G.S.
a867686e-0535-46cc-ad85-c2342086b25b
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701

Mohd Nasir, M.N., Ding, M., Murugan, G.S. and Zervas, M.N. (2014) High-Q plasmonic bottle microresonators. Photonics West 2014, , San Francisco, United States. 01 - 06 Feb 2014. (doi:10.1117/12.2039535).

Record type: Conference or Workshop Item (Paper)

Abstract

Surface Plasmon Waves (SPWs) supported by thin metal films have been used to implement high performance surface sensitive devices, such as refractometric and biochemical sensors. Recently all-glass bottle microresonators (BMRs), supporting whispering-gallery modes (WGM), have been studied in-depth with the intention to be used in advanced photonic applications, such as CQED, nonlinear devices and miniaturized sensors. In this work, we combine the two structures and demonstrate the first hybrid plasmonic BMR (PBMR). A gold layer has been deposited on the top surface of a glass BMR, fabricated by the “soften-and-compress” technique. We developed a polarization-resolving measurement set-up to fully characterize fabricated PBMRs. The uncoated BMR had 181µm waist diameter, 125µm stem diameter and 400µm length. Due to the surface curvature the gold film covered only the top BMR half with a characteristic meniscus shape with maximum thickness of 30nm. The meniscus provides appropriately tapered edges, which facilitate the adiabatic transformation of BMR WGMs into SPW and vice-versa. This results in low transition losses, which combined with partially-metal-coated resonator, can result in high hybrid-PBMR Qs.
The transmission spectra of the hybrid PBMR are dramatically different to the original uncoated BMR. Under TE(TM) excitation, the PBMR showed composite resonances with Q of ~2100(850) and almost identical ~3nm FSR. We have accurately fitted the observed transmission resonances with Lorentzian-shape curves and showed that the TE/TM composite resonances comprise two/three partially overlapping resonances with Qs in excess of 2900 and 2500, respectively. These are the highest Qs observed in plasmonic microcavities.

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More information

e-pub ahead of print date: 2014
Venue - Dates: Photonics West 2014, , San Francisco, United States, 2014-02-01 - 2014-02-06
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 363175
URI: http://eprints.soton.ac.uk/id/eprint/363175
PURE UUID: 177c09a2-63ba-4893-ae44-b6e5489dc36b
ORCID for G.S. Murugan: ORCID iD orcid.org/0000-0002-2733-3273
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 20 Mar 2014 16:32
Last modified: 09 Jan 2022 03:20

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Contributors

Author: M.N. Mohd Nasir
Author: M. Ding
Author: G.S. Murugan ORCID iD
Author: M.N. Zervas ORCID iD

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