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Title: Electrical tuning of a quantum plasmonic resonance

Journal Article · · Nature Nanotechnology
 [1];  [1];  [2];  [1];  [1];  [3];  [3];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Nanjing Univ., Nanjing (China)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Surface plasmon (SP) excitations in metals facilitate confinement of light into deep-subwavelength volumes and can induce strong light–matter interaction. Generally, the SP resonances supported by noble metal nanostructures are explained well by classical models, at least until the nanostructure size is decreased to a few nanometres, approaching the Fermi wavelength λF of the electrons. Although there is a long history of reports on quantum size effects in the plasmonic response of nanometre-sized metal particles systematic experimental studies have been hindered by inhomogeneous broadening in ensemble measurements, as well as imperfect control over size, shape, faceting, surface reconstructions, contamination, charging effects and surface roughness in single-particle measurements. In particular, observation of the quantum size effect in metallic films and its tuning with thickness has been challenging as they only confine carriers in one direction. Here, we show active tuning of quantum size effects in SP resonances supported by a 20-nm-thick metallic film of indium tin oxide (ITO), a plasmonic material serving as a low-carrier-density Drude metal. An ionic liquid (IL) is used to electrically gate and partially deplete the ITO layer. The experiment shows a controllable and reversible blue-shift in the SP resonance above a critical voltage. As a result, a quantum-mechanical model including the quantum size effect reproduces the experimental results, whereas a classical model only predicts a red shift.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1394086
Journal Information:
Nature Nanotechnology, Vol. 12, Issue 9; ISSN 1748-3387
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Cited By (19)

Tunable Metasurfaces Based on Active Materials journal March 2019
Optical Metasurfaces: Evolving from Passive to Adaptive journal April 2019
Extreme nanophotonics from ultrathin metallic gaps journal April 2019
Facile fabrication of configuration controllable self-assembled Al nanostructures as UV SERS substrates journal January 2018
Stable and tunable plasmon resonance of molybdenum oxide nanosheets from the ultraviolet to the near-infrared region for ultrasensitive surface-enhanced Raman analysis journal January 2019
Electric-field driven insulator-metal transition and tunable magnetoresistance in ZnO thin film journal April 2018
Communication: Nickel hydroxide as an exceptional deviation from the quantum size effect journal October 2018
Subwavelength coupling and ultra-high exponential gain coefficient originating from 2D electron gas at ITO/LiNbO 3 interface journal March 2019
Active control of plasmonic colors: emerging display technologies journal January 2019
Two-fluid hydrodynamic model for semiconductors journal March 2018
Dynamic thermal emission control with InAs-based plasmonic metasurfaces journal December 2018
Electro-plasmonic nanoantenna: A nonfluorescent optical probe for ultrasensitive label-free detection of electrophysiological signals journal October 2019
High-contrast optical switching using an epsilon-near-zero material coupled to a Bragg microcavity journal January 2019
Gate-tunable optical filter based on conducting oxide metasurface heterostructure journal January 2019
Selective thermal emitters with infrared plasmonic indium tin oxide working in the atmosphere journal January 2019
Suppression of near-field coupling in plasmonic antennas on epsilon-near-zero substrates journal January 2018
Material platforms for optical metasurfaces journal June 2018
Nanoantenna Structure with Mid-Infrared Plasmonic Niobium-Doped Titanium Oxide journal December 2019
Two-fluid hydrodynamic model for semiconductors text January 2017

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