Hybridization of photon-plasmon modes in metal-coated microtubular cavities

Yin, Yin; Li, Shilong; Engemaier, Vivienne; Giudicatti, Silvia; Naz, Ehsan Saei Ghareh; Ma, Libo; Schmidt, Oliver G.

doi:10.1103/physreva.94.013832

Cited by 17 publications

(12 citation statements)

References 31 publications

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“…With respect to LSPR enhancement of noble metals, the Raman signal can be further promoted through coupling with optical cavities, such as whisper‐gallery‐mode cavities, waveguide, and optical mirrors . Such hybrid plasmonic–photonic structures enable much stronger light–matter interactions and offer an improved signal collection efficiency for SERS 10c. Another efficient approach for better SERS performance is to adjust the electron transfer process between the substrates and the analytes, which is typically termed as chemical enhancement.…”

Section: Introductionmentioning

confidence: 99%

High SERS Sensitivity Enabled by Synergistically Enhanced Photoinduced Charge Transfer in Amorphous Nonstoichiometric Semiconducting Films

Fan

et al. 2019

Adv Materials Inter

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Semiconducting surface‐enhanced Raman scattering (SERS) materials have attracted tremendous attention for their good signal uniformity, chemical stability, and biocompatibility. Here, a new concept to design high sensitivity semiconducting SERS substrates through integration of both amorphous and nonstoichiometric features of WO3−x thin films is presented. The integration of these two features provides narrower bandgap, additional defect levels within the bandgap, stronger exciton resonance, and higher electronic density of states near the Fermi level. These characteristics lead to a synergy to promote the photoinduced charge transfer resonance between analytes and substrate by offering efficient routes of charge escaping and transferring as well as strong vibronic coupling, thus realizing high SERS activity on amorphous nonstoichiometric WO3−x films.

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Section: Introductionmentioning

confidence: 99%

High SERS Sensitivity Enabled by Synergistically Enhanced Photoinduced Charge Transfer in Amorphous Nonstoichiometric Semiconducting Films

Fan

et al. 2019

Adv Materials Inter

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“…This is because the resonant wavelength is mainly affected by wall thickness d for a thin wall microcavity, but by outer diameter (fixed in our calculation) for a thick wall microcavity. This can be well explained by effective potential approach [20]. But opposite to TM modes, the resonant wavelength of IN-SPPs plasmonic mode decreases almost linearly with d and that of EX-SPPs mode keeps nearly constant, showing an abnormal dispersion.…”

Section: Resultsmentioning

confidence: 78%

“…For the symmetric mode, it is a photonic-like mode at d = 2.8 μm, photons mainly concentrate inside silica wall. With the decrease of d, both the total energy and kinetic energy of confined photons in silica wall become higher [20], more photons can tunnel out through the potential barrier of outer metal film. Eventually it evolves to a plasmonic-like mode at d = 2.2 μm.…”

Section: Resultsmentioning

confidence: 99%

Double Anticrossing Coupling in a Single Metal-Clad Microcapillary

Xiang

Song

2018

IEEE Photonics J.

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Mode coupling is studied comprehensively in a proposed metal-clad microcapillary cavity, which is an optofluidic capillary with two silver films coated on both surfaces of the silica wall. The dispersion relations of resonant wavelength dependencies on wall thickness of silica microcapillary and surrounding medium index are calculated, and different types of mode coupling are observed clearly. Besides the reported traditional mode coupling, double anticrossing coupling involving two plasmonic modes and one photonic mode is achieved in a single cavity for the first time. Also, Q factors and field distributions of coupled modes are calculated, manifesting that the coupled modes are the high Q factor hybrid modes. The field evolutions of coupled modes are interpreted well by the effective potential approach. The coupled modes in such a metal-clad microcapillary could find some interesting applications requiring both the high Q factor and the high field enhancement factor.

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“…Based on the metal‐coated microtube cavities, HPP modes with three types of plasmon‐type evanescent fields have been revealed by changing the thickness of the cavity wall ( T ) and the metal coating layer ( t ). [ 125 ] For the first case, both the cavity wall and metal layer are thick, that is, T and t are comparable or larger than the wavelengths of the resonant optical light and the SPP, respectively. In this case, the plasmon‐type field of the HPP mode is predominantly located at the inner surface of the metal layer, as shown in the inset of Figure 4e.…”

Section: Hybrid Photon–plasmon (Hpp) Wgmsmentioning

confidence: 99%

Recent Progress on Optoplasmonic Whispering‐Gallery‐Mode Microcavities

Chen

Yin

et al. 2021

Advanced Optical Materials

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Optoplasmonic whispering‐gallery‐mode (WGM) microcavities, consisting of plasmonic nanostructures and optical microcavities, provide excellent platforms for exploring fundamental mechanisms as well as facilitating novel optoplasmonic applications. These integrated systems support hybrid modes with both subwavelength mode confinement and high‐quality factor which do not exist in either pure optical WGM microcavities or plasmonic resonators. In this progress report, geometric designs and fabrication strategies of optoplasmonic microcavities, which efficiently bridge the interaction between resonant light and plasmonic resonances, are reviewed in detail. Three types of hybrid modes in the optoplasmonic microcavities, that is, surface‐plasmon‐polariton whispering‐gallery modes, hybrid photon–plasmon whispering‐gallery modes, and heterostructured metal–dielectric whispering‐gallery modes, are considered. These modes are characterized by a largely enhanced evanescent field that is referred to as a plasmon‐type field in hybrid whispering‐gallery modes. Moreover, the coupling effect between localized surface plasmon resonances and whispering‐gallery modes is summarized. The underlying coupling mechanisms and their influence on mode shifts, Q factor, mode splitting, and line shapes of the whispering‐gallery modes are discussed. Applications based on optoplasmonic WGM microcavities including enhanced sensing, nanolasing, and free‐space coupling are highlighted, followed by an outlook of the opportunities and challenges in developing large‐scale on‐chip integrated optoplasmonic systems.

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Hybridization of photon-plasmon modes in metal-coated microtubular cavities

Cited by 17 publications

References 31 publications

High SERS Sensitivity Enabled by Synergistically Enhanced Photoinduced Charge Transfer in Amorphous Nonstoichiometric Semiconducting Films

High SERS Sensitivity Enabled by Synergistically Enhanced Photoinduced Charge Transfer in Amorphous Nonstoichiometric Semiconducting Films

Double Anticrossing Coupling in a Single Metal-Clad Microcapillary

Recent Progress on Optoplasmonic Whispering‐Gallery‐Mode Microcavities

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