Active polymer plane waveguide propagation constant measuring instrument based on fluorescence imaging

Abstract

The invention discloses an active polymer plane waveguide propagation constant measuring instrument based on fluorescence imaging. By utilizing a high numerical aperture microscopic object lens, a fluorescence imaging apparatus is established, an incident laser is focused by a high numerical aperture immersion microscopic object lens and is irradiated to an active polymer film, and an active substance doped in the film is excited to emit fluorescence which can be coupled to be a guided wave transmitted in a planar waveguide. In a transmission process of the guided wave, partial light energy leaks radiation to a far field along specific angles from one side of the waveguide and is collected by a same object lens for imaging at a CCD image sensor. The specific angles and optical field distribution of radiated fluorescence are associated with a propagation constant of the guided wave, the above matters are reflected on a fluorescence image recorded by a CCD, and propagation constants of various guided waves in the planar waveguide can be derived through the fluorescence image. The invention has the advantages of simple and compact structure and a high spatial resolution, and is suitable for real-time monitoring and rapid measurement of an active polymer planar waveguide propagation constant.

Description

technical field [0001] The invention relates to the technical field of measurement and calculation of intrinsic parameters of optical waveguide devices, in particular to an active polymer planar waveguide propagation constant measuring instrument based on fluorescence imaging. Background technique [0002] The integration and miniaturization of optical information processing systems have led to the rapid development of polymer planar waveguides relying on their advantages such as easy processing and low loss, and the propagation constant, one of the basic properties of optical waveguide devices, is not available in the design and research of optical devices in integrated optics. be lacked. Active substances (luminescent particles) doped in planar waveguides can effectively compensate waveguide transmission loss, and are also used to develop various active waveguide optical devices, such as waveguide lasers and waveguide amplifiers. Therefore, it is of great application valu...

AI Technical Summary

Problems solved by technology

[0003] 1. The process is cumbersome and the measurement speed is slow

The measurement of the effective refractive index of the waveguide by the M-line method requires a specific prism coupling instrument (θ-2θ instrument), and requires point-by-point scanning of the angle, which is slow and time-consuming, and cannot achieve real-time observation.

[0004] 2. Low spatial resolution

Its structure can only excite the resonant guided mode in one-dimensional direction, and there is no high numerical aperture objective lens focusing system, so the spatial resolution is low

[0005] 3. Limitations

This method is not easy to directly calculate the imaginary part of the propagation constant, that is, the propagation length of the guided wave

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