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
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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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