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Plasmonic WRR. (a) Dark-field microscope image of fabricated WRRs with different gaps. (b) SEM image along with (c) topographical, and [(d)–(g)] near-field optical [ 1530, (e) 1550, (f) 1570, and (g) 1590 nm] SNOM images of the investigated WRR. (h) Transmission WRR spectra determined experimentally from SNOM images [similar to (d)–(g)] using an analytic fit by Eq. (1) and with 3D-FEM simulations for -long input-to-output propagation [marked by lines A and B in (c)] and for three sets of WRR parameters: ring radius and gap width , and , , and .
Plasmonic BG. (a) Topographical and [(b)–(d)] near-field optical [ 1500, (c) 1560, and (d) 1620 nm] SNOM images of an -long BG with the period of 600 nm along with an inset showing an SEM image of the BG section. (e) BG reflection and transmission spectra determined experimentally from SNOM images similar to (b)–(d).
Reflection and transmission BG spectra calculated with 3D-FEM simulations for the 600 nm period BGs with different numbers of grating periods: , 30, and 50.
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