Journal
NANOPHOTONICS
Volume 10, Issue 16, Pages 4035-4043Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0380
Keywords
bound state in the continuum; terahertz; thermal emitter
Categories
Funding
- National Natural Science Foundation of China [11974221, 11974218, 91750201]
- Local science and technology development project of the central government of China [YDZX20203700001766]
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This study introduces a novel and efficient terahertz thermal emitter design, capable of producing high monochromaticity, high emissivity, and ultra-narrow bandwidth output, with additional advantages include high directionality and linear polarization.
The development of novel and cost-effective THz emitters, with properties superior to current THz sources, is an active and important field of research. In this work, we propose and numerically demonstrate a simple yet effective approach of realizing terahertz sources working in continuous-wave form, by incorporating the new physics of bound state in the continuum (BIC) into thermal emitters. By deliberately designing the structure of slotted disk array made of high-resistivity silicon on top of a low index dielectric buffer layer supported by a conducting substrate, a quasi-BIC mode with ultra-high quality factor (similar to 10(4)) can be supported. Our results reveal that the structure can operate as an efficient terahertz thermal emitter with near-unity emissivity and ultranarrow bandwidth. For example, an emitter working at 1.3914 THz with an ultranarrow linewidth less than 130 MHz, which is roughly 4 orders of magnitude smaller than that obtained from a metallic metamaterial-based thermal emitter, is shown. In addition to its high monochromaticity, this novel emitter has additional important advantages including high directionality and linear polarization, which makes it a promising candidate as the new generation of THz sources. It holds a great potential for practical applications where high spectral resolving capability is required.
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