Integrated Laser Waveguide Resonator for Compact Gas Sensing
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Solution Overview
Problem
Existing gas detecting devices face challenges in achieving miniaturization, low production cost, and low power consumption while maintaining high sensitivity and reliability, particularly in applications like breath alcohol testing and environmental monitoring.
Innovation Solution
A semiconductor gas sensor device integrating a laser structure and optical waveguide resonator on a compound semiconductor chip, utilizing a single crystalline substrate with epitaxially grown layers, allows for efficient optical coupling and precise wavelength matching to detect volatile substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectrophotometer technology is used for breath alcohol testing, then measurement precision is improved, but device size and power consumption increase
Solution Approach 1:
The device is divided into functionally independent modules: a laser unit emitting at specific wavelengths, a flow cell for sample introduction, and a detector for absorption measurement. This segmentation allows each component to be optimized independently, reducing overall device size while maintaining measurement precision through specialized design of each module
Solution Approach 2:
The patent transitions from bulk optical components to planar integrated photonic circuits, effectively moving the system into a two-dimensional footprint. Waveguides and resonators are fabricated on a chip substrate, reducing the device from three-dimensional volumetric components to a compact planar structure that maintains optical path length through multiple reflections within the chip plane
2Measurement precision
If spectrophotometer technology is used for breath alcohol testing, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The laser is operated in pulsed mode rather than continuous wave, emitting short bursts of light at specific wavelengths corresponding to alcohol absorption peaks. This periodic operation reduces average power consumption while maintaining sufficient signal intensity for accurate detection during each pulse window
Solution Approach 2:
The system operates at specific wavelength parameters matching alcohol absorption peaks (around 3.3 micrometers), allowing selective detection with minimal power. By tuning the laser wavelength precisely to absorption maxima, the system achieves high sensitivity with reduced power requirements compared to broadband illumination approaches
3Manufacturing precision
If semiconductor manufacturing is used for sensor production, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Multiple photonic components (waveguides, resonators, couplers) are merged into a single integrated photonic circuit fabricated on one semiconductor chip. This consolidation reduces the number of discrete components and interconnections, simplifying the overall device architecture while achieving miniaturization through standard semiconductor manufacturing processes
Data Source
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AI summary
The present invention relates to gas detecting devices and in particular to volatile substance sensors such as breath alcohol devices sensors. The semiconductor gas sensor device according to the invention comprises a laser structure and an optical waveguide resonator formed in a same compound semiconductor which comprises at least one optical emission layer and one optical propagation layer. The optical waveguide resonator is formed in the optical propagation layer and is to its greater part separated from the remaining portion of the optical propagation layer. The laser structure is provided adjacent to a portion of the optical waveguide resonator and arranged to transmit electromagnetic radiation at a specific wavelength band to the optical waveguide resonator arranged to resonate at that specific wavelength band.