Encoding elements and speckle spectrometer based on micro- and nano-fibers and scattering medium substrates

By employing micro-nano optical fibers and encoding elements on scattering medium substrates in speckle spectrometers, and utilizing the hierarchical spectral random control approach of scattering medium substrates, the challenges of achieving high spectral resolution and low cost in computational speckle spectrometers with small size and volume were solved, resulting in excellent spectral resolution performance and low cost.

CN117346892BActive Publication Date: 2026-06-09ZJU HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZJU HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
Filing Date
2023-08-28
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing computational speckle spectrometers face challenges in achieving high spectral resolution and low-cost encoding elements, especially in small-sized instruments where it is difficult to balance spectral resolution and cost.

Method used

By employing encoding elements based on micro/nano optical fibers and scattering medium substrates, and generating evanescent fields in the waist region of the micro/nano optical fibers and forming scattering regions with different transmittances on the scattering medium substrate, the resolution of the scattering pattern is enhanced by combining the hierarchical spectral random modulation approach of micro/nano optical fibers and scattering medium substrates.

Benefits of technology

It achieves high spectral resolution spectral analysis in a small volume while reducing costs, and is applicable to various spectral detection fields.

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Abstract

The present application relates to a kind of based on micro-nano fiber and scattering medium substrate coding element and speckle spectrometer.The coding element includes sealed cavity, micro-nano fiber and scattering medium substrate;Including drawstring transition zone and waist zone in the body of micro-nano fiber, drawstring transition zone forms leaky mode, waist zone generates evanescent field, the body of micro-nano fiber penetrates sealed cavity, so that drawstring transition zone and waist zone are located in sealed cavity;Scattering medium substrate is fixed in sealed cavity, and the waist zone of micro-nano fiber is overlapped on scattering medium substrate, scattering medium substrate is used to receive evanescent field and is coupled leaky mode to obtain scattering pattern information;Wherein, in the direction parallel to waist zone, scattering medium substrate includes more than two scattering zones, and the light transmittance of each scattering zone is different, and the difference between maximum light transmittance and minimum light transmittance is 20%~80%.Speckle spectrometer using the coding element of the present application has the advantages of small size, low cost while high spectral resolution.
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