11 Label-Free Super-Resolution Microscopy by Nonlinear …
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are fast enough (approximately 100 fs [36, 37]) to be detected by a single pulse at a
duration of 2 ps. On the other hand, in silicon, the carrier excitation which leads to
changes in reflectance is slower (~700 fs) and we could not probe efficiently NMPR
with a single 2 ps pulse. The results of two-color and single-color PM reflectivity
on Au pattern are depicted in Fig. 11.9. Note that the resolution of the gold samples
scan at the second harmonics of both single and P&P schemes is equal, and amount
to 95 ± 5 nm.
Fig. 11.9 Super-resolution photo-modulated reflectivity using single color or two colors. The sample consists of Au double lines, 125 nm wide, with gaps of 370, 270, and 180 nm, respectively. a Line
imaging of probe reflection (red) and pump reflection (purple). b Two-color photo-modulated reflectivity line imaging using first (blue) and second (black) harmonics. c Single-color photo-modulated
reflectivity using first (orange) and second (black) harmonics. Note the resolution enhancement (95
± 5 nm) at 2 ω1 in both two- and single-color modalities. Reproduced with permission from [23],
OSA
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are fast enough (approximately 100 fs [36, 37]) to be detected by a single pulse at a
duration of 2 ps. On the other hand, in silicon, the carrier excitation which leads to
changes in reflectance is slower (~700 fs) and we could not probe efficiently NMPR
with a single 2 ps pulse. The results of two-color and single-color PM reflectivity
on Au pattern are depicted in Fig. 11.9. Note that the resolution of the gold samples
scan at the second harmonics of both single and P&P schemes is equal, and amount
to 95 ± 5 nm.
Fig. 11.9 Super-resolution photo-modulated reflectivity using single color or two colors. The sample consists of Au double lines, 125 nm wide, with gaps of 370, 270, and 180 nm, respectively. a Line
imaging of probe reflection (red) and pump reflection (purple). b Two-color photo-modulated reflectivity line imaging using first (blue) and second (black) harmonics. c Single-color photo-modulated
reflectivity using first (orange) and second (black) harmonics. Note the resolution enhancement (95
± 5 nm) at 2 ω1 in both two- and single-color modalities. Reproduced with permission from [23],
OSA