Enhancing plasmonic hot-carrier generation by strong coupling of multiple resonant modes

Yat Lam Wong; Huaping Jia; Aoqun Jian; Dangyuan Lei; Abdel I. El Abed; Xuming Zhang

doi:10.1039/D0NR07643K

Enhancing plasmonic hot-carrier generation by strong coupling of multiple resonant modes

Yat Lam Wong, Huaping Jia, Aoqun Jian, Dangyuan Lei (Corresponding Author), Abdel I. El Abed, Xuming Zhang (Corresponding Author)

Research output: Journal article publication › Journal article › Academic research › peer-review

15 Citations (Scopus)

Abstract

Plasmon-induced hot carriers have recently attracted intensive research, but the energy efficiency in the visible light is often low due to the short lifetime of hot carriers and the limited optical absorption of plasmonic architectures. To boost the eneration of hot carriers, here we propose to exert multiple plasmonic resonant modes and their strong coupling using a metal-dielectric-metal (MDM) nanocavity that consists of an Au nanohole array (AuNHA), a TiO2 thin film and an Au reflector. Unlike common MDM structures, in addition to the Fabry-Pérot mode in the dielectric layer, the AuNHA as the top layer is special since it excites the localized surface plasmon resonance (LSPR) mode in the Au nanoholes and launches the gap surface plasmon polariton (GSPP) mode in the Au reflector surface. The spatial field overlapping of three resonance modes enables strong mode coupling by optimizing the TiO2 thickness, leading to notably enhanced average IPCE (~1.5%) and broadband photocurrent (170 μA∙cm^-2). This MDM structure would be useful for photochemistry and photovoltaics using sunlight.

Original language	English
Pages (from-to)	2792–2800
Number of pages	9
Journal	Nanoscale
Volume	13
Issue number	5
DOIs	https://doi.org/10.1039/D0NR07643K
Publication status	Published - 7 Feb 2021

Keywords

Gold nanohole array
Strong mode coupling
hot carriers
Surface plasmon resonance
Plasmonics

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1039/D0NR07643KLicence: CC BY

http://hdl.handle.net/10397/90128

Cite this

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title = "Enhancing plasmonic hot-carrier generation by strong coupling of multiple resonant modes",

abstract = "Plasmon-induced hot carriers have recently attracted intensive research, but the energy efficiency in the visible light is often low due to the short lifetime of hot carriers and the limited optical absorption of plasmonic architectures. To boost the eneration of hot carriers, here we propose to exert multiple plasmonic resonant modes and their strong coupling using a metal-dielectric-metal (MDM) nanocavity that consists of an Au nanohole array (AuNHA), a TiO2 thin film and an Au reflector. Unlike common MDM structures, in addition to the Fabry-P{\'e}rot mode in the dielectric layer, the AuNHA as the top layer is special since it excites the localized surface plasmon resonance (LSPR) mode in the Au nanoholes and launches the gap surface plasmon polariton (GSPP) mode in the Au reflector surface. The spatial field overlapping of three resonance modes enables strong mode coupling by optimizing the TiO2 thickness, leading to notably enhanced average IPCE (~1.5%) and broadband photocurrent (170 μA∙cm^-2). This MDM structure would be useful for photochemistry and photovoltaics using sunlight.",

keywords = "Gold nanohole array, Strong mode coupling, hot carriers, Surface plasmon resonance, Plasmonics",

author = "Wong, {Yat Lam} and Huaping Jia and Aoqun Jian and Dangyuan Lei and {El Abed}, {Abdel I.} and Xuming Zhang",

note = "This work is supported by the Research Grants Council of Hong Kong (152184/15E, 152127/17E, 152126/18E, 152219/19E, 152156/20E, 15304519 and N_PolyU511/20), The Hong Kong Polytechnic University (1-ZE14, 1-ZE27 and 1-ZVGH), The City University of Hong Kong (9610434). The technical assistance and facility support from Materials Research Centre and from the University Research Facility in Material Characterization and Device Fabrication of The Hong Kong Polytechnic University are acknowledged.",

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AU - Jia, Huaping

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AU - Lei, Dangyuan

AU - El Abed, Abdel I.

AU - Zhang, Xuming

N1 - This work is supported by the Research Grants Council of Hong Kong (152184/15E, 152127/17E, 152126/18E, 152219/19E, 152156/20E, 15304519 and N_PolyU511/20), The Hong Kong Polytechnic University (1-ZE14, 1-ZE27 and 1-ZVGH), The City University of Hong Kong (9610434). The technical assistance and facility support from Materials Research Centre and from the University Research Facility in Material Characterization and Device Fabrication of The Hong Kong Polytechnic University are acknowledged.

PY - 2021/2/7

Y1 - 2021/2/7

N2 - Plasmon-induced hot carriers have recently attracted intensive research, but the energy efficiency in the visible light is often low due to the short lifetime of hot carriers and the limited optical absorption of plasmonic architectures. To boost the eneration of hot carriers, here we propose to exert multiple plasmonic resonant modes and their strong coupling using a metal-dielectric-metal (MDM) nanocavity that consists of an Au nanohole array (AuNHA), a TiO2 thin film and an Au reflector. Unlike common MDM structures, in addition to the Fabry-Pérot mode in the dielectric layer, the AuNHA as the top layer is special since it excites the localized surface plasmon resonance (LSPR) mode in the Au nanoholes and launches the gap surface plasmon polariton (GSPP) mode in the Au reflector surface. The spatial field overlapping of three resonance modes enables strong mode coupling by optimizing the TiO2 thickness, leading to notably enhanced average IPCE (~1.5%) and broadband photocurrent (170 μA∙cm^-2). This MDM structure would be useful for photochemistry and photovoltaics using sunlight.

AB - Plasmon-induced hot carriers have recently attracted intensive research, but the energy efficiency in the visible light is often low due to the short lifetime of hot carriers and the limited optical absorption of plasmonic architectures. To boost the eneration of hot carriers, here we propose to exert multiple plasmonic resonant modes and their strong coupling using a metal-dielectric-metal (MDM) nanocavity that consists of an Au nanohole array (AuNHA), a TiO2 thin film and an Au reflector. Unlike common MDM structures, in addition to the Fabry-Pérot mode in the dielectric layer, the AuNHA as the top layer is special since it excites the localized surface plasmon resonance (LSPR) mode in the Au nanoholes and launches the gap surface plasmon polariton (GSPP) mode in the Au reflector surface. The spatial field overlapping of three resonance modes enables strong mode coupling by optimizing the TiO2 thickness, leading to notably enhanced average IPCE (~1.5%) and broadband photocurrent (170 μA∙cm^-2). This MDM structure would be useful for photochemistry and photovoltaics using sunlight.

KW - Gold nanohole array

KW - Strong mode coupling

KW - hot carriers

KW - Surface plasmon resonance

KW - Plasmonics

U2 - 10.1039/D0NR07643K

DO - 10.1039/D0NR07643K

M3 - Journal article

SN - 2040-3364

VL - 13

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EP - 2800

JO - Nanoscale

JF - Nanoscale

IS - 5

ER -

Enhancing plasmonic hot-carrier generation by strong coupling of multiple resonant modes

Abstract

Keywords

UN SDGs

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