Plasmonic Pyroelectric Detector for High-Speed Infrared Detection
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Solution Overview
Problem
Commercial pyroelectric detectors have millisecond to microsecond response times, which are significantly slower than photodiodes and photoconductors, making it challenging to achieve high-resolution and fast frame rates, especially in infrared applications, where they are used for beam profiling and uncooled imaging.
Innovation Solution
Integration of a plasmonic metasurface with a pyroelectric material to create a detector that converts light into heat rapidly, allowing for picosecond-scale response times and eliminating the need for external optical filters and complex signal processing, by using a subwavelength thick absorber that localizes heat close to the pyroelectric material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pyroelectric detectors are used for infrared detection, then they can detect thermal energy and operate without cooling, but their response times are millisecond to microsecond scale, which is significantly slower than photodiodes
Solution Approach 1:
The patent combines a plasmonic metasurface absorber with a pyroelectric material in a single integrated detector structure. The metasurface is directly coupled to the pyroelectric layer, merging the light-absorbing function and thermal detection function into one compact device, which enables fast response times while maintaining ease of fabrication
Solution Approach 2:
The patent changes the optical absorption parameters by introducing a plasmonic metasurface with subwavelength structures. This metasurface is designed to absorb specific wavelengths of light and convert them to heat rapidly, changing the thermal response parameters of the detector to achieve picosecond-scale response times
2Measurement precision
If array size is increased to achieve high resolution, then spatial resolution improves, but readout time becomes proportional to array size, making fast frame rates difficult to achieve
Solution Approach 1:
The patent implements parallel readout architecture where multiple detectors in the array can be read out simultaneously or in parallel groups. This preliminary organization of the readout system allows high-resolution arrays to achieve fast frame rates by reducing the sequential readout time penalty associated with large array sizes
3Measurement precision
If external optical filters are used for spectral selection, then spectral purity improves, but device complexity and size increase
Solution Approach 1:
The patent merges the spectral filtering function with the light-absorbing function by designing the plasmonic metasurface to be wavelength-selective. The metasurface structures are engineered to absorb specific wavelengths while reflecting others, integrating spectral selection directly into the detector active area, thereby eliminating the need for separate external optical filters and reducing overall system complexity
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 achieves response times in the MHz or GHz regime, significantly faster than commercial detectors, enabling high-speed, spectrally selective detection of radiation, and reduces the complexity and size of the detector system.
Implementation Method 1
an artificial optical absorber or plasmonic absorber (e.g., metamaterial absorber) comprising an ensemble of subwavelength conductive components forming a plasmonic structure configured to receive light and to generate thermal energy from the received light
Implementation Method 2
a pyroelectric material configured to receive the generated thermal energy from the plasmonic structure and to generate an electrical signal representative of the received thermal energy
Data Source
AI summary
High speed and spectrally selective pyroelectric detectors with plasmonic structure and methods of making and using same are disclosed. According to an aspect, a pyroelectric detector includes an artificial optical absorber or plasmonic absorber comprising an ensemble of subwavelength conductive components forming a plasmonic structure configured to receive light and to generate thermal energy from the received light. Further, the pyroelectric detector includes a pyroelectric material configured to receive the generated thermal energy from the plasmonic structure and to generate an electrical signal representative of the received thermal energy. Further, the pyroelectric detector includes an electronic component configured to receive the electrical signal from the pyroelectric material for detection of the received light.