Thang Minh Nguyen Cho, YongDeok Huh, Ji-Hyeok Ahn, Hayun Kim, NaYeoun Rho, Kyung Hun Lee, Jaewon Kwon, Min Park, Sung Hun Kim, ChaeEon Kim, Kwangjin Kim, Young-Seok Lee, Seungwoo 2024-01-19T10:03:16Z 2024-01-19T10:03:16Z 2023-11-29 2023-02 1530-6984 https://pubs.kist.re.kr/handle/201004/113991 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 mu m 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. English American Chemical Society Ultralow-Loss Substrate for Nanophotonic Dark-Field Microscopy Article 10.1021/acs.nanolett.2c05030 1 Nano Letters, v.23, no.4, pp.1546 - 1554 Nano Letters 23 4 1546 1554 N scie scopus 000933176900001 2-s2.0-85148047945 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article PLASMONIC RESONANCES OPTICAL-PROPERTIES PARTICLE NANOPARTICLES SCATTERING COLLOIDS GOLD Dark-field spectroscopy Nanophotonics Plasmonics Mie scattering Nanoparticles