Voltage-Tuned On-Chip Spectrometer for Compact Spectral Reconstruction
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Solution Overview
Problem
Traditional spectrometers have large device footprints due to mechanically movable components, and on-chip spectrometers face limitations in resolution and increased manufacturing costs due to the need for large arrays of photodetectors.
Innovation Solution
An on-chip spectrometer with a single photodetection layer and a photoresponse matrix that can be tuned by applied electrical voltage biases, allowing for a smaller device footprint and improved spectral resolution through a streamlined and cost-efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanically movable components are used in traditional spectrometers, then spectral measurement capability is achieved, but device footprint becomes large
Solution Approach 1:
The patent replaces mechanically movable components (gratings, interferometers) with a fixed photodetection layer that uses electrical voltage biases to tune photodetection properties. This substitution eliminates mechanical moving parts while maintaining spectral measurement capability, directly resolving the contradiction between measurement precision and device footprint.
Solution Approach 2:
The patent changes the operational parameters of the photodetection layer by applying different electrical voltage biases to tune the photodetection properties across different spectral ranges. This allows a single fixed device to achieve the spectral measurement capability previously requiring mechanical components, thereby reducing device footprint while maintaining measurement precision.
2Measurement precision
If large arrays of photodetectors are used in on-chip spectrometers, then spectral resolution is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The patent makes a single photodetection layer perform multiple spectral detection functions by tuning its photodetection properties through applied voltage biases. Instead of requiring multiple photodetectors for different spectral ranges, one photodetection layer can be electrically tuned to detect across various spectral ranges, reducing manufacturing complexity while maintaining spectral resolution.
Solution Approach 2:
The patent uses electrical voltage biases to dynamically change the photodetection properties of the photodetection layer, allowing it to resolve different spectral components. This parameter-based tuning approach replaces the need for complex multi-detector arrays, simplifying manufacturing while achieving high spectral resolution through the photoresponse matrix.
3Measurement precision
If large arrays of photodetectors are used in on-chip spectrometers, then spectral resolution is improved, but manufacturing costs increase
Solution Approach 1:
The patent enables a single photodetection layer to serve multiple spectral detection roles through electrical tuning, eliminating the need to manufacture and assemble large arrays of photodetectors. This universal approach significantly reduces manufacturing costs while maintaining the spectral resolution needed for various applications.
Solution Approach 2:
The patent creates a photoresponse matrix that mathematically represents the spectral information, serving as a computational copy of what would otherwise require physical photodetector arrays. This computational approach reduces the need for expensive physical detector arrays while preserving spectral resolution through matrix-based spectral reconstruction.
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 a compact, cost-effective spectrometer with enhanced spectral resolution by using a photoresponse matrix to reconstruct spectra, reducing manufacturing complexity and costs while maintaining high performance.
Implementation Method 1
a single photodetection layer that is capable of generating an electrical signal (e.g., voltage or current) in response to incident source (e.g., light)
Implementation Method 2
The voltage drain and the voltage source may be configured to measure the photoresponse generated by the photodetection layer. A photoresponse matrix associated with the apparatus may be configured with values determined based at least in part on the photoresponse of the photodetection layer generated in response to one or more applied electrical voltage biases to tune the photodetection layer properties
Data Source
AI summary
Apparatuses and methods are provided for reconstructing a spectrum of an incident source. An example apparatus includes a photodetection layer, a voltage source, and a voltage drain. In some embodiments, the example apparatus further includes one or more gate electrodes. The photodetection layer includes one or more photodetection materials and is configured to generate a photoresponse vector in response to an incident source and/or gate electrodes. The voltage source and voltage drain are electrically connected to the photodetection layer and are configured to measure the photoresponse vector generated by the photodetection layer. The spectrum of the unknown incidence light can be reconstructed by using the photoresponse vector and the pre-measured response matrix.