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Reflection Mechanism of Dielectric Corner Reflectors : The Role of the Diffraction of Evanescent Waves and the Goos–Hänchen Shift

Title data

Matsumori, Kishin ; Fujimura, Ryushi ; Retsch, Markus:
Reflection Mechanism of Dielectric Corner Reflectors : The Role of the Diffraction of Evanescent Waves and the Goos–Hänchen Shift.
In: ACS Omega. Vol. 7 (2022) Issue 27 . - pp. 23353-23361.
ISSN 2470-1343
DOI: https://doi.org/10.1021/acsomega.2c01537

Official URL: Volltext

Project information

Project financing: ERC VISIRday, 714968

Abstract in another language

Nano- and microstructures have been developed for asymmetric light transmission (ALT) filters operating in a wide wavelength range. One of the most straightforward structures with ALT properties is a dielectric corner reflector (DCR) comprising a one-dimensional grating of a triangular shape on one surface. The DCR possesses strong reflection only for one-way light illumination due to multiple total internal reflections (TIRs) inside the triangular grating. For triangular structures being much larger than the wavelength of light, the reflection properties are expected to be fully described by geometrical optics. However, geometrical optics do not account for the Goos–Hänchen (GH) shift, which is caused by the evanescent wave of the TIR. In this work, the reflection mechanism of DCRs is elucidated using the finite element method and a quantitative model built by considering the GH shift. The reduction in reflection of the DCR is dominated by diffraction of the evanescent wave at the corner of the triangular structure. Our model is based on simple mathematics and can optimize the DCR geometry for applications addressing a wide wavelength range such as radiative cooling.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Emerging Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Affiliated Institutes
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Nov 2022 09:07
Last Modified: 03 Nov 2022 12:12
URI: https://eref.uni-bayreuth.de/id/eprint/72641