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Nano-optics multi-parameter measurement platform

A measurement platform and multi-parameter technology, applied in the field of nano optics, can solve the problems of small openness, large sample stage size, and insufficient flexibility of excitation light path, etc., and achieve continuous adjustable incident angle, controllable polarization state, and flexible operation Effect

Active Publication Date: 2012-12-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the excitation optical path of the current commercial SNOM system generally has the problems of insufficient flexibility, adjustable parameters, especially the extremely limited incidence angle, and the equipped sample stages are often large in size, small in openness, and have few degrees of freedom in sample adjustment.
The singleness of excitation light path and sample adjustment greatly limits the optical excitation and optical property measurement of nanophotonics devices and materials

Method used

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  • Nano-optics multi-parameter measurement platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Measurement of near-field light intensity distribution characteristics of metal nanoholes

[0042] Metal nanoholes can form nanoscale light spots in the optical near-field region, and are one of the important metal nanostructures in the field of nanophotonics. Bowtie holes have attracted extensive attention due to their antenna effect, so they are important for near-field optics. The measurement of information is very necessary. Bowtie aperture 29 is an anisotropic structure, and its light field distribution is closely related to the polarization state of the excitation light. In order to obtain a better quality exit spot, it is necessary to adjust the direction of the bottom edge of the Bowtie aperture to be parallel to the direction of the excitation light field. Its adjustment diagram is as follows Figure 4 As shown, 28 is the electric field direction of the excitation light, 29 is the Bowtie aperture, the solid line is the case where the aperture struct...

Embodiment 2

[0052] Example 2: Measurement of Surface Plasmon Resonance Characteristics of Smooth Gold Film Under Evanescent Field Coupling Excitation

[0053] Surface plasmon polaritons (SPPs) are electromagnetic oscillations coupled with charge density fluctuations excited on the metal-dielectric interface. They have the characteristics of near-field enhancement, surface confinement, and short wavelength. play an important role in the research. Usually, the wavevector of SPPs does not match the wavevector of light, so SPPs can be excited by light only in special configurations, and one of the commonly used configurations is to use the evanescent field coupling generated by the total internal reflection of a prism to excite SPPs. Under this configuration, on the one hand, the incident angle of the excitation light is required to meet the plasmon resonance angle, which is greater than the critical angle of total internal reflection; on the other hand, the excitation light must be p-polariz...

Embodiment 3

[0062] Embodiment 3: Measuring the near-field optical properties of the smooth gold film under linear polarization and radial polarization excitation.

[0063] Radially polarized light is a special form of Bessel beam. Radially polarized light exhibits cylindrical symmetry characteristics on a cylindrically symmetric light field cross section, and the polarization direction of each point is along the radial direction. This light field distribution can focus the beam energy most effectively. In this embodiment, the results of excitation of a smooth gold film by linearly polarized light and radially polarized light are compared. Specific steps are as follows:

[0064] S1. Coating a layer of gold film on the glass substrate, the film thickness is less than 100nm to ensure light transmittance;

[0065] S2. Place the glass substrate processed with the sample in the sample position and direction fine-tuning unit of the optical multi-parameter measurement platform;

[0066] S3. T...

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Abstract

The invention relates to the technical field of reactor engineering and discloses a nanophotonics multi-parameter measurement platform. The nanophotonics multi-parameter measurement platform comprises a multi-parameter variable excitation system, a sample position direction fine-adjusting unit, a microscope observation alignment system, a scanning near-field optical microscope detection system and a computer; the sample position direction fine-adjusting unit is used for mounting a sample to be measured; the multi-parameter variable excitation system provides a lighting excitation light source signal to the sample to be measured; the microscope observation alignment system adjusts an imaging area of the sample to be measured, collects the image information of the sample to be measured, and transmits the image information to the computer to be displayed; the scanning near-field optical microscope detection system collects the optical near-field information of the sample to be measured and transmits the optical near-field information to the computer; and the computer processes the optical near-field information and then displays the processed optical near-field information. The nano-optics multi-parameter measurement platform is compact in structure, can achieve adjustment with multiple degrees of freedom, and can achieve optical excitation of variable excitation wavelength, continuous adjustment of the incident angle and controllable polarization state on a given excitation area of a nano photonics device.

Description

technical field [0001] The invention relates to the field of nano-optic technology, in particular to a multi-parameter measurement platform for nano-optical materials and nano-photonic devices based on a near-field optical microscope. Background technique [0002] The research of nanophotonics has rapidly become an international frontier and hot spot in recent years. Its goal is to manipulate and control photons at the nanoscale, realize the regulation of light waves and light fields, and develop smaller, faster, more efficient, Optical devices with stronger signals can realize integrated photonic circuits and provide a more powerful physical theoretical basis and production technology basis for the next generation of information technology. Nanophotonics devices use the optical near-field as a signal carrier, and realize various functions through the local electromagnetic interaction between nanoscale materials and structures and the optical near-field, and have advantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01N21/25G01B11/24
Inventor 王佳王庆艳张明倩武晓宇
Owner TSINGHUA UNIV
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