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Title: Plasmon resonant amplification of hot electron-driven photocatalysis

Abstract

We discuss plasmon resonant excitation of hot electrons in a metal based photocatalyst in the oxygen evolution half reaction in aqueous solution. In this report, the photocatalyst consists of a 100-nm thick Au film deposited on a corrugated silicon substrate. Here, hot electrons photoexcited in the metal are injected into the solution, ultimately reversing the water oxidation reaction (O 2+4H ++4e–⇌2H 2O) and producing a photocurrent. In order to amplify this process, the gold electrode is patterned into a plasmon resonant grating structure with a pitch of 500 nm. The photocurrent (i.e., charge transfer rate) is measured as a function of incident angle using 633 nm wavelength light. We observe peaks in the photocurrent at incident angles of ±9° from normal when the light is polarized parallel to the incident plane (p-polarization) and perpendicular to the lines on the grating. Due to these peaks, we estimate an overall plasmonic gain (or amplification) factor of 2.1× in the charge transfer rate. At these same angles, we also observe sharp dips in the photoreflectance, corresponding to the condition when there is wavevector matching between the incident light and the plasmon mode in the grating. No angle dependence is observed in the photocurrentmore » or photoreflectance when the incident light is polarized perpendicular to the incident plane (s-polarization) and parallel to the lines on the grating. Finite difference time domain simulations also predict sharp dips in the photoreflectance at ±9°, and the electric field intensity profiles show clear excitation of a plasmon-resonant mode when illuminated at those angles with p-polarized light.« less

Authors:
ORCiD logo [1];  [2];  [1];  [1];  [1];  [1];  [3];  [4];  [3];  [3]; ORCiD logo [1]
  1. Univ. of Southern California, Los Angeles, CA (United States)
  2. Ciencia Inc., East Hartford, CT (United States); Univ. of Connecticut, Storrs, CT (United States)
  3. Ciencia Inc., East Hartford, CT (United States)
  4. SUNY Polytechnic Inst., Albany, NY (United States)
Publication Date:
Research Org.:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
OSTI Identifier:
1540255
Alternate Identifier(s):
OSTI ID: 1469429
Grant/Contract Number:  
FG02-07ER46376; CBET-1512505
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 11; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Shen, Lang, Gibson, George N., Poudel, Nirakar, Hou, Bingya, Chen, Jihan, Shi, Haotian, Guignon, Ernest, Cady, Nathaniel C., Page, William D., Pilar, Arturo, and Cronin, Stephen B. Plasmon resonant amplification of hot electron-driven photocatalysis. United States: N. p., 2018. Web. doi:10.1063/1.5048582.
Shen, Lang, Gibson, George N., Poudel, Nirakar, Hou, Bingya, Chen, Jihan, Shi, Haotian, Guignon, Ernest, Cady, Nathaniel C., Page, William D., Pilar, Arturo, & Cronin, Stephen B. Plasmon resonant amplification of hot electron-driven photocatalysis. United States. doi:10.1063/1.5048582.
Shen, Lang, Gibson, George N., Poudel, Nirakar, Hou, Bingya, Chen, Jihan, Shi, Haotian, Guignon, Ernest, Cady, Nathaniel C., Page, William D., Pilar, Arturo, and Cronin, Stephen B. Tue . "Plasmon resonant amplification of hot electron-driven photocatalysis". United States. doi:10.1063/1.5048582. https://www.osti.gov/servlets/purl/1540255.
@article{osti_1540255,
title = {Plasmon resonant amplification of hot electron-driven photocatalysis},
author = {Shen, Lang and Gibson, George N. and Poudel, Nirakar and Hou, Bingya and Chen, Jihan and Shi, Haotian and Guignon, Ernest and Cady, Nathaniel C. and Page, William D. and Pilar, Arturo and Cronin, Stephen B.},
abstractNote = {We discuss plasmon resonant excitation of hot electrons in a metal based photocatalyst in the oxygen evolution half reaction in aqueous solution. In this report, the photocatalyst consists of a 100-nm thick Au film deposited on a corrugated silicon substrate. Here, hot electrons photoexcited in the metal are injected into the solution, ultimately reversing the water oxidation reaction (O2+4H++4e–⇌2H2O) and producing a photocurrent. In order to amplify this process, the gold electrode is patterned into a plasmon resonant grating structure with a pitch of 500 nm. The photocurrent (i.e., charge transfer rate) is measured as a function of incident angle using 633 nm wavelength light. We observe peaks in the photocurrent at incident angles of ±9° from normal when the light is polarized parallel to the incident plane (p-polarization) and perpendicular to the lines on the grating. Due to these peaks, we estimate an overall plasmonic gain (or amplification) factor of 2.1× in the charge transfer rate. At these same angles, we also observe sharp dips in the photoreflectance, corresponding to the condition when there is wavevector matching between the incident light and the plasmon mode in the grating. No angle dependence is observed in the photocurrent or photoreflectance when the incident light is polarized perpendicular to the incident plane (s-polarization) and parallel to the lines on the grating. Finite difference time domain simulations also predict sharp dips in the photoreflectance at ±9°, and the electric field intensity profiles show clear excitation of a plasmon-resonant mode when illuminated at those angles with p-polarized light.},
doi = {10.1063/1.5048582},
journal = {Applied Physics Letters},
number = 11,
volume = 113,
place = {United States},
year = {2018},
month = {9}
}

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