Ultralow-Loss Substrate for Nanophotonic Dark-Field Microscopy
- Authors
- Nguyen, Thang Minh; Cho, YongDeok; Huh, Ji-Hyeok; Ahn, Hayun; Kim, NaYeoun; Lee, Jaewon; Kwon, Min; Park, Sung Hun; Rho, Kyung Hun; Kim, ChaeEon; Kim, Kwangjin; Kim, Young-Seok; Lee, Seungwoo
- Issue Date
- Feb-2023
- Publisher
- American Chemical Society
- Keywords
- Dark-field spectroscopy; Mie scattering; Nanoparticles; Nanophotonics; Plasmonics
- Citation
- Nano Letters, v.23, no.4, pp 1546 - 1554
- Pages
- 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Nano Letters
- Volume
- 23
- Number
- 4
- Start Page
- 1546
- End Page
- 1554
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/115226
- DOI
- 10.1021/acs.nanolett.2c05030
- ISSN
- 1530-6984
1530-6992
- Abstract
- For the colloidal nanophotonic structures, a transmission electron microscope (TEM) grid has been widely used as a substrate of dark-field microscopy because a nanometer-scale feature can be effectively determined by TEM imaging following dark-field microscopic studies. However, an optically lossy carbon layer has been implemented in conventional TEM grids. A broadband scattering from the edges of the TEM grid further restricted an accessible signal-to-noise ratio. Herein, we demonstrate that the freely suspended, ultrathin, and wide-scale transparent nanomembrane can address such challenges. We developed a 1 mm by 600 μm scale and 20 nm thick poly(vinyl formal) nanomembrane, whose area is around 180 times wider than a conventional TEM grid, so that the possible broadband scattering at the edges of the grid was effectively excluded. Also, such nanomembranes can be formed without the assistance of carbon support; allowing us to achieve the highest signal-to-background ratio of scattering among other substrates. © 2023 American Chemical Society.
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