Radiation Detector Using Phase Change Material Waveguide
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Solution Overview
Problem
Current radiation detectors for Tera Hertz (THz) and infrared (IR) radiation lack sensitivity and efficient thermal isolation, leading to suboptimal performance in detecting radiation.
Innovation Solution
A radiation detector comprising a waveguide structure, a sensing structure with a phase change material that transitions between two distinct phase states under radiation exposure, an optical transmitter, and an optical receiver, allowing for efficient thermal isolation and high sensitivity detection through changes in complex refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MEMS based structures with electrical readout are used, then the detector can detect THz and IR radiation, but the sensitivity and thermal isolation are insufficient
Solution Approach 1:
The patent replaces the electrical readout mechanism with an optical readout mechanism. An optical waveguide transmits light through the phase change material, and the changes in the material's optical properties (refractive index, absorption coefficient) during phase transition are detected optically. This substitution enables efficient thermal isolation while maintaining high detection sensitivity for THz and IR radiation.
Solution Approach 2:
The patent utilizes phase change materials (such as VO2) that undergo phase transitions between insulating and metallic states in response to radiation exposure. These phase transitions cause measurable changes in optical properties, enabling the detector to convert radiation detection into optical signal changes, thereby achieving both thermal isolation and high sensitivity.
2Reliability
If phase change material is used for sensing, then thermal isolation is improved, but the device complexity increases
Solution Approach 1:
The optical waveguide structure serves multiple functions: it acts as both the transmission medium for optical signals and the sensing element. The phase change material is integrated directly into the waveguide, allowing the same structure to perform thermal isolation, radiation detection, and optical signal transmission simultaneously, thereby reducing overall device complexity despite the advanced materials used.
Solution Approach 2:
The patent merges the sensing function with the optical transmission function by integrating the phase change material directly into the optical waveguide structure. This consolidation eliminates separate sensing elements and readout mechanisms, reducing device complexity while maintaining effective thermal isolation through the phase change material's properties.
3Productivity
If optical readout is used instead of electrical readout, then thermal isolation is efficient and response time is fast, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by optimizing the optical properties of the phase change material at specific locations within the waveguide where the optical field is most intense. The sensing region is localized to areas with maximum optical field overlap, ensuring that only the necessary portions of the material need to be precisely positioned and characterized, thereby reducing overall manufacturing precision requirements while maintaining fast response time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient thermal isolation and fast response times, achieving high sensitivity in detecting radiation by utilizing phase change materials like vanadium dioxide, which transitions between insulating and metallic states, facilitating efficient thermal management and improved detection capabilities.
Implementation Method 1
The phase change material comprises as phase states a first phase state at a first temperature range and a second phase state at a second temperature range. The phase change material is configured to transition from the first phase state to the second phase state under exposure of the radiation.
Implementation Method 2
According to such an embodiment metal-insulator transition (MIT) materials may be used as phase change materials. Such materials provide a high temperature sensitivity and are hence particularly suited for radiation detectors.
Implementation Method 3
The sensing structure is arranged in an evanescent field area of the waveguide structure. The sensing structure is configured to provide for an evanescent field of the optical sensing signal a first complex refractive index in the first phase state of the phase change material and a second complex refractive index in the second phase state of the phase-state material.
Implementation Method 4
The real part of the complex refractive index corresponds to the refractive index and the imaginary part corresponds to the absorption coefficient of the phase change material.
Implementation Method 5
The optical transmitter is configured to transmit an optical sensing signal to the optical receiver and the optical receiver is configured to receive the optical sensing signal from the transmitter via the waveguide structure.
Implementation Method 6
The imaginary part of the complex refractive index corresponds to the absorption coefficient of the phase change material.
Implementation Method 7
Detection of Tera Hertz and infrared radiation requires highly sensitive radiation detectors.
Data Source
AI summary
A radiation detector and method and computer program product for detecting radiation. The detector comprises a waveguide structure, a sensing structure comprising a phase change material, an optical transmitter and optical receiver. The optical transmitter transmits an optical sensing signal for receipt at the optical receiver via the waveguide structure. The phase change material comprises a first phase state at a first temperature range and a second phase state at a second temperature range and transitions from the first phase state to the second phase state under exposure of the radiation. The sensing structure is arranged in an evanescent field area of the waveguide structure and provides for an evanescent field of the optical sensing signal a first complex refractive index in the first phase state and a second complex refractive index in the second phase state. The first complex refractive index is different from the second complex refractive index.