Open AccessSpectral control of near-field thermal radiation via photonic band engineering of two-dimensional photonic crystal slabs
Author(s) -
Takuya Inoue,
Tanemasa Asano,
Susumu Noda
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.032074
Subject(s) - photonic crystal , optics , materials science , optoelectronics , thermophotovoltaic , photonics , common emitter , black body radiation , band gap , narrowband , thermal radiation , radiation , physics , thermodynamics
In this paper, we numerically investigate a method to obtain narrow-bandwidth near-field thermal radiation spectra by using two-dimensional (2D) photonic crystal (PC) slabs. Our examination reveals that near-field thermal radiation spectra can be artificially controlled via the photonic band engineering of 2D-PC slabs, where the radiation is enhanced in a range of frequencies of the flat bands and suppressed inside the photonic bandgap. By designing a thermal emitter with a 2D-PC slab of appropriate thickness, and by adjusting the gap between the emitter and the absorber, we can implement narrowband near-field thermal radiation that overcomes the far-field blackbody limit in the near-infrared range. Further, its linewidth is as small as Δλ = 0.14 µm.