Fixed-Wavelength Laser Photonic Sensor Phase Modulation
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Solution Overview
Problem
Current evanescent-field photonic biosensor systems require expensive and bulky tunable lasers, which are impractical for point-of-care applications due to their high cost and size, limiting their use in detecting analytes such as proteins and antibodies effectively.
Innovation Solution
The use of a fixed-wavelength laser in conjunction with a phase shift mechanism within the optical waveguide, where the phase shift is modulated by heating or electro-optic effects, allowing for the detection and quantification of analytes by monitoring changes in light intensity and phase shift, thereby eliminating the need for tunable lasers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tunable laser is used to detect resonant wavelength shifts, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/optical tuning mechanism of a tunable laser with an electrical phase modulation system. Instead of physically tuning the laser wavelength, the invention uses a phase modulator to impose a time-varying phase shift on a fixed-wavelength laser beam, thereby achieving wavelength scanning functionality through electrical control. This substitution dramatically simplifies the device while maintaining measurement precision.
Solution Approach 2:
The invention changes the operating parameter from variable wavelength (tunable laser) to fixed wavelength with variable phase. By keeping the laser wavelength fixed and introducing a controllable phase modulation, the system achieves the same functional outcome (scanning through resonant conditions) with a simpler device. The phase modulation parameter is varied to simulate the effect of wavelength tuning.
2Productivity
If a tunable laser is used for rapid wavelength sweeping, then measurement speed is improved, but device size and cost increase
Solution Approach 1:
The patent replaces the bulky tunable laser mechanism with a compact fixed-wavelength laser combined with an electronic phase modulator. The phase modulator can be integrated on the same chip as the waveguide, eliminating the need for large external laser tuning components. This substitution achieves rapid wavelength sweeping through electrical phase modulation while dramatically reducing system size.
3Device complexity
If a fixed-wavelength laser with phase modulation is used, then device cost and size are reduced, but measurement precision may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the detected optical signal is used to determine the phase modulation parameters. By monitoring the transmitted or reflected light intensity and using this information to adjust the phase modulation, the system can accurately identify resonant wavelength shifts. The feedback loop ensures that measurement precision is maintained despite using a simpler fixed-wavelength laser setup.
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
This approach enables cost-effective and compact systems for detecting analytes, improving the practicality for point-of-care applications by using a fixed-wavelength laser and phase shift modulation within the optical waveguide, enhancing the detection efficiency and reducing the system's size and cost.
Implementation Method 1
the phase shift is modulated by heating or electro-optic effects
Implementation Method 2
the phase shift is modulated by heating or electro-optic effects
Implementation Method 3
The use of a fixed-wavelength laser in conjunction with a phase shift mechanism within the optical waveguide
Implementation Method 4
Evanescent-field photonic sensors have been shown to be effective for detecting a range of analytes
Implementation Method 5
An evanescent-field biosensor typically includes an optical resonator that includes an optical waveguide
Data Source
AI summary
A sensor architecture that uses fixed wavelength light and tunes a wavelength dependent response of a sensor may be used for detecting analytes in a wide range of applications. The sensor architecture is based on optical resonators or interferometers comprising optical waveguides. A resonance wavelength and/or transmission/reflection spectrum are affected by presence of an analyte adsorbed on a surface of the waveguide, and a setting of a phase modulator. The sensors include a sensor portion where part of the waveguide is exposed to a sample for sensing, and a phase modulator part. The phase modulator part may include a heater that is controlled to tune, or sweep, or modulate the resonant wavelength and/or spectrum of the sensor.