Nanowire Array Detector for Wavelength-Selective Single-Photon Sensing
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Solution Overview
Problem
Conventional optical detectors lack wavelength selectivity and are cumbersome due to the need for additional optical elements, which add size, weight, and complexity, and are limited in detecting single photons effectively.
Innovation Solution
A frequency selective electromagnetic detector using a nanowire array with nanoparticle-sized diameter thermoelectric junctions between nanowires of different compositions, capable of emitting electrical pulses proportional to photon energy, allowing for wavelength-sensitive single-photon detection without the need for external filters or precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical detectors are used, then detection capability is achieved, but wavelength selectivity is lacking and device complexity increases due to additional optical elements
Solution Approach 1:
The patent combines wavelength selection and photon detection functions into a single integrated nanowire array structure. Different compositions of nanowires provide wavelength selectivity while the thermoelectric junctions perform detection, eliminating the need for separate optical filters or selection elements that would increase device complexity.
Solution Approach 2:
The nanowire array structure serves multiple functions simultaneously: it acts as both the wavelength-selective filter and the photon detector. The different nanowire compositions provide spectral selectivity while the thermoelectric junctions convert absorbed photon energy into electrical signals, making the device multi-functional without requiring additional components.
2Measurement precision
If additional optical elements are added for wavelength selection, then wavelength selectivity is improved, but device size and weight increase
Solution Approach 1:
The patent merges the wavelength selection function traditionally performed by separate optical elements with the detection function in a single nanowire array structure. This integration eliminates the need for additional optical filters, gratings, or prisms that would add weight to the device.
Solution Approach 2:
The patent uses nanowires of different local compositions within the array to provide wavelength selectivity at the nanoscale level. Each nanowire composition is optimized for specific wavelength ranges, allowing the device to achieve spectral discrimination without requiring bulky macroscopic optical filtering elements.
3Measurement precision
If additional optical elements are added for wavelength selection, then wavelength selectivity is improved, but device size increases
Solution Approach 1:
The patent combines wavelength selection and detection functions into a single integrated nanowire array structure. Different compositions of nanowires provide wavelength selectivity while the thermoelectric junctions perform detection, eliminating the need for separate optical filters or selection elements that would increase device size.
Solution Approach 2:
The patent uses nanowires of different local compositions within the array to provide wavelength selectivity at the nanoscale level. Each nanowire composition is optimized for specific wavelength ranges, allowing the device to achieve spectral discrimination without requiring bulky macroscopic optical filtering elements.
4Reliability
If conventional detectors are used, then detection is possible, but single-photon detection effectiveness is limited
Solution Approach 1:
The patent changes the detection mechanism by using thermoelectric junctions that convert absorbed photon energy directly into electrical voltage pulses. This parameter change in the detection principle enables single-photon level sensitivity because the voltage pulse magnitude is directly proportional to the absorbed photon energy, providing reliable single-photon detection without complex signal amplification chains.
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
Enables wavelength-selective single-photon detection with reduced complexity and size, overcoming limitations of conventional detectors like photomultipliers and avalanche photodiodes by directly converting photon energy into electrical signals.
Implementation Method 1
when at least one nanoparticle-sized diameter thermoelectric junction senses at least one photon, the nanoparticle-sized diameter thermoelectric junction(s) emits at least one electrical pulse voltage that is proportional to the energy level of the photon(s) that is sensed
Data Source
AI summary
An apparatus, system, and method are disclosed for a frequency selective electromagnetic detector. In particular, the frequency selective electromagnetic detector includes a nanowire array constructed from a plurality of nanowires of different compositions. At least one nanoparticle-sized diameter thermoelectric junction is formed between the nanowires of different compositions. When a nanoparticle-sized diameter thermoelectric junction senses a photon, the nanoparticle-sized diameter thermoelectric junction emits an electrical pulse voltage that is proportional to an energy level of the sensed photon. In one or more embodiments, the frequency selective electromagnetic detector is a frequency selective optical detector that is used to sense photons having optical frequencies. In at least one embodiment, at least one of the nanowires in the nanowire array is manufactured from a compound material including Bismuth (Bi) and Tellurium (Te).