Spoof Plasmon Waveguide Sensing for Small Permittivity Changes
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Solution Overview
Problem
Existing plasmonic sensors face challenges in detecting small permittivity changes associated with analytes in the electromagnetic frequency range, particularly in gas and fluid sensing, due to weak dependence on phase composition, and there is a need for sensors that operate with improved sensitivity and ease of manufacturing.
Innovation Solution
A spoof plasmonic sensor with a waveguide comprising substrate-based spoof plasmon cavities that change permittivity upon contact with an analyte, allowing detection through electromagnetic signal modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional plasmonic sensors are used for gas and fluid sensing, then the sensing mechanism is established, but the sensitivity is insufficient due to weak dependence on phase composition
Solution Approach 1:
The patent changes the operating frequency parameter from optical to microwave range, which fundamentally alters the interaction mechanism with analytes. This parameter change enables detection of small permittivity changes that are not detectable in the optical range, thereby resolving the sensitivity issue while maintaining adaptability to different phase compositions
Solution Approach 2:
The patent introduces a new dimensional aspect by operating in the microwave frequency dimension rather than the traditional optical dimension. This dimensional shift allows the sensor to access different physical phenomena (spoof surface plasmon polaritons) that provide enhanced sensitivity for detecting permittivity changes in gases and liquids
2Measurement precision
If the sensor operates in the microwave frequency range, then the sensitivity for detecting small permittivity changes is improved, but the device dimensions increase compared to optical plasmonic devices
Solution Approach 1:
The sensor is segmented into periodic groove structures with specific spacings that are optimized for microwave frequencies. This segmentation allows the device to achieve the necessary electromagnetic field localization and resonance characteristics while maintaining a compact form factor suitable for practical applications
Solution Approach 2:
By changing the operating frequency to microwave range and adjusting the groove spacing parameter accordingly, the device achieves enhanced permittivity detection sensitivity. The groove spacing is specifically designed to create spoof surface plasmon polaritons at microwave frequencies, which provides the needed sensitivity without requiring excessively large device dimensions
3Measurement precision
If periodic grooves are used to create spoof plasmon cavities, then the sensing response is enhanced through field localization, but the device complexity increases
Solution Approach 1:
The patent replaces complex optical plasmonic structures with simpler microwave-frequency spoof plasmon structures. The periodic groove pattern, while geometrically simple, creates the necessary electromagnetic field localization and resonance effects that would require much more complex structures in the optical regime, thereby reducing fabrication complexity while maintaining enhanced sensing response
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 sensor provides nearly instantaneous detection of analytes with high sensitivity, capable of detecting gaseous and liquid analytes at concentrations between 100% to 1000 ppm, and operates in the microwave frequency range with enhanced interaction and ease of device manufacturing.
Implementation Method 1
a substrate with a superior surface, wherein a conductive material is disposed on the superior surface of the substrate, wherein said conductive material defines a waveguide, wherein said waveguide defines a plurality of spoof plasmon cavities comprising exposed substrate, and wherein said substrate is configured to change in permittivity when contacted by an analyte
Implementation Method 2
electric fields have increased localization in the substrate region which serves to improve sensing response to substrate permittivity changes
Implementation Method 3
The surface plasmon phenomena is directly linked to a resonance between positive and negative permittivity values at dielectric/metal interfaces
Implementation Method 4
a conductive material is disposed on the superior surface of the substrate, wherein said conductive material defines a waveguide
Data Source
AI summary
A method to detect the presence and or concentration of an analyte in the environment of a spoof plasmon sensor having the steps of: providing a spoof plasmon sensor into an environment; interrogating said spoof plasmon sensor with an electromagnetic signal; collecting a modified electromagnetic signal from the spoof plasmon sensor; and analyzing the modified electromagnetic signal to detect an analyte in the environment of the sensor. A spoof plasmon sensor for detecting an analyte having a substrate with a superior surface; and a conductive material disposed on said superior surface, said conductive material defining a waveguide having a dual tapering shape, wherein said waveguide defines spoof plasmon cavities which are exposed substrate, where said substrate is configured to change in permittivity when contacted by an analyte.