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(a) Schematic of the experimental setup for particle trapped optical microscopy based on two-photon-induced MDR from a trapped microsphere. The inset shows the grating sample produced by the two-photon polymerization method. (b) Schematic of particle coordinates. (c) Detection windows of spectral bandwidth for measuring the fluorescence intensity from a single MDR peak and valley. (d) One-dimensional AFM trace of the grating structure.
One-dimensional scanning of the grating structure. Image is the standard reflection confocal imaging and image is the laser trapped probe image. Confocal trace and laser trapped probe trace show that two elements of the grating have different FWHM’s of 0.95, 1.20, 0.59, and 0.60 , respectively.
Laser trapped probe profiles: (a)–(d) integrated signal, (e)–(h) peak signal, (i)–(l) valley signal, for scanning velocities of 8.7, 10.8, 12.9, and , respectively.
(a) Average contrast of the one-dimensional images of the grating structure with integrated, peak, and valley imaging modalities. (b) One-dimensional spectrally resolved image of the grating structure.
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