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. Author manuscript; available in PMC: 2018 Sep 26.
Published in final edited form as: Nat Photonics. 2018 Mar 26;12(4):195–201. doi: 10.1038/s41566-018-0134-3

Figure 3. In-situ optical spectroscopy of different metal nanoparticles trapped via OTENT.

Figure 3

a, Optical setup of OTENT with in-situ dark-field optical imaging and spectroscopy. Dark-field optical images, experimental and simulated scattering spectra, and electric field profiles of single AgNSs b, with diameters of 70, 90 and 100 nm; single AuNSs c, with diameters of 80, 90 and 100 nm; single AuNTs d, with side lengths of 60 and 140 nm; single AuNRs e, with lengths of 50-60 and diameters of 19-25 nm and corresponding absorption peaks at around 650 nm (top panel); with lengths of 63-73 nm and diameters of 19-25 nm and corresponding absorption peaks at around 700 nm (bottom panel). The solid and dashed curves represent experimental and simulated scattering spectra, respectively. The grey rectangles represent the peak distributions recorded in multiple experiments. Scale bars: 2 μm.