Abstract: This disclosure is applicable to the field of optical measurement technology, and provides a method and device for ultrasensitive displacement sensing based on local spin characteristics, the method comprises: using an excitation light to excite and generate a near-field optical vortex field, NF-OV in which a local spin state linearly changes with a position at a detection; coupling the local spin state of the NF-OV to a far-field by using a nanostructure, so as to obtain elliptically polarized light; and detecting the spin degree of elliptically polarized light to obtain displacement information of the position at the detection. The sensing method provided by the disclosure can obtain accurate displacement information, has high sensitivity, low cost and high practical value.

Abstract: A fluorescence microscopy method and system, the method comprising the steps of applying optical vortices to a metal surface for generating surface plasmon resonance (SPR) waves at the metal surface; and collecting fluorescence light excited by the SPR waves; wherein a dynamic characteristic of the optical vortices is controlled for controlling interference patterns of the SPR waves.