Laser light can induce many effects on the vicinity of the sample surface due to the proximity effects,such as the field enhancement at the surface of a small conducting particle;plasma exchange effect between the met...Laser light can induce many effects on the vicinity of the sample surface due to the proximity effects,such as the field enhancement at the surface of a small conducting particle;plasma exchange effect between the metallic tip and substrate surface.We have observed a new optical tip-sample interaction:laser induced force as the results of light pressure in the near-field region.Under the side illumination of a laser light,an additional attractive force was observed between a dielectric tip and various samples of C60,optical glass,YBa_(2)Cu_(3)O_(7-d)(YBCO)thin film.No such effect was observed in metallic samples.This optical binding force is due to the multiple scattering of light between two close objects.The results are in good agreement with the recent theoretical calculation.The effects of the optical refraction index,thermal expansion of probe tip due to laser radiation are discussed.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19674004。
文摘Laser light can induce many effects on the vicinity of the sample surface due to the proximity effects,such as the field enhancement at the surface of a small conducting particle;plasma exchange effect between the metallic tip and substrate surface.We have observed a new optical tip-sample interaction:laser induced force as the results of light pressure in the near-field region.Under the side illumination of a laser light,an additional attractive force was observed between a dielectric tip and various samples of C60,optical glass,YBa_(2)Cu_(3)O_(7-d)(YBCO)thin film.No such effect was observed in metallic samples.This optical binding force is due to the multiple scattering of light between two close objects.The results are in good agreement with the recent theoretical calculation.The effects of the optical refraction index,thermal expansion of probe tip due to laser radiation are discussed.
