Plasmonic Metasurface BAW Detector With Acoustic Bragg Mirror
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Solution Overview
Problem
Combining a plasmonic metasurface with a bulk acoustic wave (BAW) resonator in optical detectors faces challenges due to spurious modes and acoustic resonance degradation, which affect the accuracy of light detection.
Innovation Solution
Incorporating an acoustic Bragg mirror between the plasmonic metasurface and the BAW resonator with different acoustic impedance layers to reflect acoustic waves away from the metasurface, and optimizing thermal isolation through contact design to enhance detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a plasmonic metasurface is combined with a BAW resonator in optical detectors, then light detection capability is enhanced, but spurious modes and acoustic resonance degradation occur
Solution Approach 1:
An acoustic Bragg mirror is introduced as an intermediary layer between the plasmonic metasurface and the BAW resonator. This mirror reflects acoustic waves away from the metasurface, preventing spurious mode generation and acoustic resonance degradation while maintaining the enhanced light detection capability provided by the metasurface-BAW combination.
2Power
If the plasmonic metasurface absorbs incident light, then thermal energy is generated for detection, but acoustic waves may be scattered back to the metasurface causing resonance degradation
Solution Approach 1:
The acoustic Bragg mirror serves as a protective intermediary that reflects acoustic waves away from the plasmonic metasurface. This prevents acoustic resonance degradation caused by wave scattering while allowing the metasurface to continue generating thermal energy from absorbed incident light for detection purposes.
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 acoustic Bragg mirror effectively suppresses spurious modes, improving the acoustic resonance response and detection sensitivity of the optical detector.
Implementation Method 1
a plasmonic metasurface configured to absorb a portion of an incident light on the optical device, wherein the portion of the incident light has a frequency range that is narrower than a frequency spectrum of the incident light
Implementation Method 2
absorbing the portion of the incident light generates thermal energy at the plasmonic metasurface
Implementation Method 3
a BAW resonator configured to receive the thermal energy from the plasmonic metasurface, convert an applied electrical signal into an acoustic wave, and shift an acoustic resonance frequency of the acoustic wave according to the thermal energy
Implementation Method 4
an acoustic Bragg mirror between the plasmonic metasurface and the BAW resonator, the acoustic Bragg mirror configured to reflect a portion of the acoustic wave away from the plasmonic metasurface and toward the BAW resonator
Data Source
AI summary
An apparatus for an optical detector includes a bulk acoustic wave (BAW) resonator including a piezoelectric layer and a metal layer, an acoustic Bragg mirror on the BAW resonator and including a first acoustic impedance layer and a second acoustic impedance layer different than the first acoustic impedance layer, and a plasmonic metasurface on the acoustic Bragg mirror and including structures of geometric patterns arranged in an array.