Journal
NANO LETTERS
Volume 17, Issue 8, Pages 4583-4587Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00900
Keywords
Plasmonics; upconversion; quantum wells; GaN
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001293]
- Department of Defense through the National Defense Science and Engineering (NDSEG) fellowship program
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Manipulating the frequency of electromagnetic waves forms the core of many modern technologies, ranging from imaging and spectroscopy to radio and optical communication. The process of converting photons from higher to lower energy is easily accomplished and technologically widespread. However, upconversion, which is the process of converting lower-energy photons into higher-energy photons, is still a growing field of study with nascent applications and burgeoning interest. Here, we experimentally demonstrate a new photon upconversion technique mediated by hot carriers in plasmonic nanostructures. Hot holes and hot electrons generated via plasmon decay in illuminated metal nanoparticles are injected into an adjacent semiconductor quantum well where they radiatively recombine to emit higher-energy photons. Using GaN/InGaN quantum wells decorated with gold and silver nanoparticles, we show photon upconversion from 2.4 to 2.8 eV. The process scales linearly with illumination power and enables both geometry- and polarization-based tunability. The conversion of plasmonic losses into upconverted optical emission has the potential to impact bioimaging, on-chip wavelength conversion, and high-efficiency photovoltaics.
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