Tham khảo tài liệu 'micromechanical photonics - h. ukita part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Experimental Analysis 191 5 mm Fig. . SNOM images scattered light intensity of eefractive index grating by gold particle probe with s-polarized illumination -----Zero-order gratings -----------p-polarized Fig. . Relationship between scattered light intensity and refractive index grating distribution Fig. . SEM photograph of optical disk groove and its profile - um -5 mm Figure shows the SNOM topography profile obtained with and without a gold particle probe under p-polarized illumination with the addition of glycerol 13 to suppress the particle s Brownian motion. We can clearly see the groove pitch of pm with the gold probe. Figure shows the relationship between the averaged scattered light intensity and the groove profile. The scattered light with the gold particle solid line has a high intensity at the groove edge and has split peaks which correspond to the gradient of the 192 5 Near Field 5 .Without .With 5 0 Fig. . SNOM topography of optical disk tracking groove with without gold particle probe under p-polarized illumination ----- With gold particle . Without gold particle Fig. . Relationship between scattered light intensity and disk groove profile with and without gold particle surface profile. On the other hand the scattered light without the gold particle broken line has a single peak at the groove edge. The difference between the two bold solid line seems to correspond to the surface topology because the effect of the laser light reflection is removed and the vertical displacement of the gold particle appears due to the scanning on the groove. In summary the near field for a refractive index grating fabricated on a PLC is observed by scanning an optically trapped 100-nm-diameter gold particle. The amplitude for the refractive index modulation of the cladding layer index is estimated to be between and . Stable trapping and scanning cc cuư with a Gaussĩan aaser beam at a f ic n velocity of .
