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A PSIM with a dual offset grating used to focus a waveguide mode onto the lollipop NFT.
Optical pump-probe setup for characterizing surface-plasmon resonance. : quarter-wave plate; : half-wave plate; PM: polarizing maintaining; BS: beam splitter; and NA: numerical aperture.
(a) Photothermal images at the excitation wavelength , 860, and 950 nm, (b) the normalized peak signal as a function of , and (c) the calculated light absorption as a function of . In (a) both horizontal and vertical axis are in micrometers. The bar is in millivolts.
(a) The normalized peak photothermal signal and (b) the calculated light absorption in the NFT as a function of for the NFT of peg length of 62.5 nm. The lollipop is 20-nm-thick and the disk diameter is 190 nm.
Surface topography as a function of peg length after 1.87 mW laser illumination at . The lollipop is 20-nm-thick with disk diameter of 190 nm and peg width of 60 nm. These devices were overlapped by . Each frame is by . The dash circle is a guide of the eyes for the mark recorded by the NFT.
Same as Fig. 5 , except that the disk diameter of the NFT is 150 nm and the excitation light wavelength is 880 nm. The optical power for recording is .
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