A tunable total internal reflection optical excitation device with surface wave field enhancement
A technology of total internal reflection and optical excitation, applied in the field of guided wave optics and optical measurement, which can solve the problem of limited increase in light intensity.
Active Publication Date: 2019-07-05
FUDAN UNIV
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Even for systems that use lasers as light sources, the increase in light intensity is very limited, not to mention the use of incoherent light sources
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[0025] The surface wave field enhanced and tunable total internal reflection optical excitation device designed by the present invention specifically includes: a precision lifting platform, an inverted trapezoidal prism, a collimated excitation beam that undergoes total internal reflection, and an ultra-thin flat object-bearing glass , a certain air gap should be maintained between the inverted trapezoidal prism and the ultra-thin plane object glass, and a set of optical and spectral measurement systems, and a certain air gap should be maintained between the sample to be measured and the optical and spectral measurement system. When the incident angle is greater than the internal total reflection angle on the upper surface of the inverted trapezoidal prism, different incident angles are selected to excite the horizontal guided wave mode in the ultra-thin planar object glass, and the surface evanescence formed by the guided wave on its upper surface is used The wavefield perform...
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Abstract
The invention belongs to the technical field of guide wave optics and optical measurement, and specifically relates to a surface wave field enhancement tunable total internal reflection optical excitation device. The device comprises a precise lift platform, an inverted-trapezoid prism, a collimation excitation beam, ultrathin plane slide glass and an optical and spectral measurement system. A certain air gap is kept between the inverted-trapezoid prism and the ultrathin plane slide glass; and a certain air gap is kept between a sample to be measured and the optical and spectral measurement system. Under the condition that the incidence angle is larger than the internal total reflection angle of the upper surface of the inverted-trapezoid prism, by selecting different incidence angles to motivate a horizontal guided wave mode in the ultrathin plane slide glass, by utilizing a surface evanescent wave filed formed on the upper surface thereof through the guided waves to carry out optical excitation on the sample to be measured, and by strictly controlling the distance between the inverted-trapezoid prism and the ultrathin plane slide glass by utilizing the precise lift platform, continuous adjustment of field enhancement of evanescent waves on the upper surface of the ultrathin plane slide glass can be realized. The surface wave field enhancement tunable total internal reflection optical excitation device has important applications in the aspects of measurement of fluorescence spectrum, absorption spectrum and Raman spectrum of a micro-nano material and the like.
Description
technical field [0001] The invention belongs to the technical field of guided wave optics and optical measurement, and in particular relates to a surface wave field enhanced and tunable total internal reflection optical excitation device. Background technique [0002] Total internal reflection fluorescence (TIRF) and surface-enhanced Raman spectroscopy are two effective methods for studying the structure of surface / interface materials. They both use surface evanescent waves to excite molecules shallowly, and There will be no excitation effect on a large number of molecules in the target object, so that selective measurement and analysis can be realized. However, the intensity of the evanescent wave generated by directly using the surface of the high-refractive-index prism is very weak, and generally can only reach the intensity of the incident light. For this reason, to obtain higher intensity evanescent waves, only increase the incident light intensity. For systems that u...
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IPC IPC(8): G01N21/64
CPCG01N21/31G01N21/64G01N21/65G02B27/56
Inventor 刘建华陶李蒋孛李旦朱国栋蔡文斌
Owner FUDAN UNIV