Polaritonic Optical Fluid Sensor With On-Chip Electrical Readout
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Solution Overview
Problem
Existing optical fluid sensors, particularly gas sensors, are hindered by the need for bulky and expensive optical elements, which impedes miniaturization, and lack effective electrical detection of low dimensional polaritons, leading to reduced sensitivity and performance.
Innovation Solution
An optical fluid sensor integrated into a common chip, comprising a substrate, optoelectronic active material stack, and circuitry, which launches polaritons for far-field and/or near-field interactions with fluids, transducing these interactions into electrical signals, utilizing polaritonic materials like graphene and dielectrics to enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bulky optical elements (filters and detectors) are used in optical fluid sensors, then sensing performance is achieved, but device miniaturization is hindered and complexity increases
Solution Approach 1:
The patent combines multiple optical functions (filtering and detection) into a single integrated photodetector device. The photodetector is designed with specific spectral response characteristics that enable it to selectively detect target analytes without requiring separate optical filters, thereby reducing device complexity and enabling miniaturization while maintaining sensing performance
Solution Approach 2:
The photodetector is designed to perform multiple functions simultaneously: it acts as both the detection element and the spectral filtering element. The device can detect multiple target analytes with different spectral signatures using a single detector, reducing the need for multiple specialized optical components and enabling device miniaturization
2Measurement precision
If external photodetectors and optical interferometers are used for polariton detection, then detection capability is achieved, but device size becomes bulky and portability is reduced
Solution Approach 1:
The patent integrates the polariton generation capability and detection capability into a single compact photodetector device. The photodetector is designed to generate and detect low-dimensional polaritons internally, eliminating the need for external optical interferometers and separate detection equipment, thereby dramatically reducing device size while maintaining detection capability
Solution Approach 2:
The patent uses two-dimensional materials (such as graphene or transition metal dichalcogenides) as an intermediary layer that enables both polariton generation and detection within the photodetector. This intermediary material allows the device to achieve sophisticated polariton-based sensing functionality in a compact form factor without requiring external bulky optical equipment
3Illumination intensity
If patterned graphene nanoribbons are used to sustain plasmons, then optical interaction is enhanced, but graphene mobility diminishes and sensor performance is reduced
Solution Approach 1:
The patent applies local patterning of graphene or uses localized plasmonic structures that confine optical fields to specific regions. This approach enhances optical interaction where needed (at the sensing interface) while preserving the bulk graphene's high mobility properties, thus maintaining overall sensor performance. The patterning is optimized to provide sufficient optical enhancement without excessively degrading carrier mobility
Solution Approach 2:
The patent employs composite structures combining graphene with other two-dimensional materials or with metallic nanostuctures. These composite materials provide both enhanced optical interaction (through plasmonic or photonic effects) and maintained or enhanced charge carrier mobility, resolving the contradiction between optical enhancement and electrical performance
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 achieves high sensitivity and selectivity, enabling fast detection below 1 second with compact, CMOS-compatible, low-power consumption, and room-temperature operation, suitable for portable devices, without requiring external photodetectors.
Implementation Method 1
a polaritonic launcher configured and arranged to, upon illumination (in any direction: top illumination, bottom illumination, side illumination, or a combination thereof), launch polaritons (in other words, provide the necessary momentum for the polaritons to propagate) into said optoelectronic active material stack to propagate there across
Implementation Method 2
said polaritons carry out far-field and/or near-field optical interactions with one or more molecular and/or atomic vibrational modes of the fluid
Implementation Method 3
said polaritons carry out far-field and/or near-field optical interactions with one or more molecular and/or atomic vibrational modes of the fluid
Implementation Method 4
said circuitry together with said electrically active material structure are configured and arranged to sense the fluid by transducing said optical interactions into an electrical signal representing a change in a property of the polaritons
Data Source
AI summary
An optical fluid sensor is disclosed, wherein the optical fluid sensor comprises, integrated into a common chip:a substrate;an optoelectronic active material stack intended to be exposed to a fluid or to an intermediate element exposed to said fluid or to said intermediate element exposed to said fluid;a polaritonic launcher to, upon illumination, launch polaritons into the optoelectronic active material stack to propagate there across; andcircuitry in electrical contact with an electrically active material structure of the stack.The optoelectronic active material stack is configured and arranged so that the polaritons optically interact with one or more molecular vibrational modes of the fluid, and the circuitry together with the electrically active material structure are configured and arranged to sense the fluid by transducing those optical interactions into an electrical signal.An optical fluid sensor arrangement, such as an array, comprising a plurality of the optical fluid sensors of the invention is also disclosed.