We show that graphene decorated with Ag nanodisks realizes spectrally selective thermal emission by means of acoustic graphene plasmons (AGPs) localized between graphene and the Ag nanodisks inside a dielectric material. Our finite-difference time domain (FDTD) calculations show that the spectrally selective thermal radiation emission can be tuned by means of a gate voltage into two different wavelength regimes, namely the atmospherically opaque regime between λ = 5 μm and λ = 8 μm or the atmospherically transparent regime between λ = 8 μm and λ = 12 μm. This allows for electrical switching between a radiative heat trapping mode for the former regime and a radiative cooling mode for the latter regime.
Using finite-difference time domain (FDTD) calculations we show that hybrid graphene-dielectric-metal nanostructures can achieve daytime radiative cooling. While a metal back mirror reflects solar light, metal nanoparticles on the dielectric-graphene heterostructure host acoustic graphene plasmons that allow for electrostatic tuning of their resonance wavelengths; in particular, the resonance wavelengths can be tuned to overlap in the mid-infrared (mid-IR) with the atmospherically transparent windows between 3 um and 5 um and also between 8 um and 12 um, thereby achieving net radiative cooling at ambient temperatures. M.N.L. achknowledges support by the ORISE fellowship 2022/2023.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.