Spatio-spectral decomposition of complex eigenmodes in subwavelength nanostructures through transmission matrix analysis
- Authors
- Jin, Young-Ho; Oh, Juntaek; Choi, Wonshik; Kim, Myung-Ki
- Issue Date
- 5월-2022
- Publisher
- WALTER DE GRUYTER GMBH
- Keywords
- mode analysis; nano optics; plasmonics; SVD; transmission matrix
- Citation
- NANOPHOTONICS, v.11, no.9, pp.2149 - 2158
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOPHOTONICS
- Volume
- 11
- Number
- 9
- Start Page
- 2149
- End Page
- 2158
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/140508
- DOI
- 10.1515/nanoph-2021-0653
- ISSN
- 2192-8606
- Abstract
- Exploiting multiple near-field optical eigenmodes is an effective means of designing, engineering, and extending the functionalities of optical devices. However, the near-field optical eigenmodes of subwavelength plasmonic nanostructures are often highly multiplexed in both spectral and spatial distributions, making it extremely difficult to extract individual eigenmodes. We propose a novel mode analysis method that can resolve individual eigenmodes of subwavelength nanostructures, which are superimposed in conventional methods. A transmission matrix is constructed for each excitation wavelength by obtaining the near-field distributions for various incident angles, and through singular value decomposition, near-field profiles and energy spectra of individual eigenmodes are effectively resolved. By applying transmission matrix analysis to conventional electromagnetic simulations, we clearly resolved a set of orthogonal eigenmodes of single- and double-slot nanoantennas with a slot width of 20 nm. In addition, transmission matrix analysis leads to solutions that can selectively excite specific eigenmodes of nanostructures, allowing selective use of individual eigenmodes.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - ETC > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.