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Device and method for detecting sub-wavelength-scale multi-focal light spot polarization orientation

A multi-focus, sub-wavelength technology, applied in the polarization of measuring light, measuring device, optical radiation measurement, etc., can solve the problem of no intuitive and effective method for detection, and achieve the effect of intuitive detection results.

Active Publication Date: 2017-12-26
LUDONG UNIVERSITY
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Problems solved by technology

However, there is no intuitive and effective method for the detection of the polarization direction of sub-wavelength multi-focus spots within the field of view of high numerical aperture microscope objectives with a size of only a few hundred nanometers and a distance of only a few microns.

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  • Device and method for detecting sub-wavelength-scale multi-focal light spot polarization orientation
  • Device and method for detecting sub-wavelength-scale multi-focal light spot polarization orientation
  • Device and method for detecting sub-wavelength-scale multi-focal light spot polarization orientation

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Embodiment Construction

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are the embodiment of the present invention One embodiment, not all embodiments.

[0027] Such as figure 1 , the 532nm wavelength laser 1 passes through the beam expander and collimation system 2, becomes a parallel beam, and then passes through a linear polarizer 3 to become linearly polarized light. The expanded and collimated linearly polarized light enters the first beam splitter 4 and then vertically enters the reflective spatial light modulator 5 (model Holoeye Pluto, resolution 1080×1920). The third computer 21 loads the phase modulation map of the independently adjustable multi-focus spot to the reflective spatial light modulator 5 . Aft...

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Abstract

The invention discloses a device and a method for detecting sub-wavelength-scale multi-focal light spot polarization orientation. An angularly polarized laser beam can generate multiple light spots different in polarization orientation on a focal plane after being modulated through a pure phase spatial light modulator. A periodic slit microstructure on the surface of a gold film is put on the focal plane, and when polarization direction of the light spots is perpendicular to orientation of a slit, incident light spots can be coupled into surface plasmons in a most effective manner. When the polarization direction of the light spots is parallel to the orientation of the slit, the incident light spots almost cannot excite the surface plasmons. When the polarization direction of the light spots and the orientation of the slit form an included angle smaller than 90 degrees, coupling efficiency is directly proportional to a squared value of cosine of the included angle. Surface plasmon intensity of a position where multiple light spots are located can be observed through a leakage radiation submicro imaging system, so that detection of polarization orientation of each light spot is realized.

Description

technical field [0001] The invention relates to a device for detecting the polarization orientation of multi-focus light spots on a sub-wavelength scale, and also relates to a method for detecting the polarization orientation of multi-focus light spots on a sub-wavelength scale. Background technique [0002] The laser beam is focused by a high numerical aperture objective lens to produce a spot of subwavelength size. Special phase modulation, amplitude modulation and polarization modulation of the incident laser can produce various special-shaped spots, such as needle spot, ring spot, spherical spot, longitudinally polarized spot, helical spot, two-dimensional array spot, three-dimensional array spot , chain facula, etc. These special spots can be applied in many fields such as optical data storage, laser particle manipulation, atomic waveguide, fluorescence super-resolution imaging, and laser micro-nano processing. [0003] The polarization direction of the light spot is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J4/00
CPCG01J4/00G01J4/04
Inventor 陈建农朱林伟李志刚徐钦峰
Owner LUDONG UNIVERSITY
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