Optofluidic Antenna With Refractive Index Gradient for Photon Detection
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Solution Overview
Problem
Conventional optical detection techniques for single analytes in liquids suffer from low photon detection efficiencies and limitations in long-term observation due to the lack of fixed position and orientation of molecules in solution.
Innovation Solution
An optofluidic antenna device is employed, comprising a substrate and a liquid layer with a gas volume above it, forming a refractive index gradient that directs photons towards the substrate, allowing for enhanced photon collection efficiency and extended observation time without requiring fixed molecular positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical detection techniques are used for single analytes in liquids, then the detection can be performed with standard equipment, but the photon detection efficiency is low and observation time is limited
Solution Approach 1:
The patent introduces an optofluidic antenna as an intermediary structure between the analyte and the detection system. This antenna, formed by a liquid layer with specific refractive index gradient, mediates the interaction between light and the analyte, enhancing both photon detection efficiency and extending observation time without requiring fixed molecular positions.
Solution Approach 2:
The patent changes the refractive index parameter by creating a liquid layer with a gradient (n=1.33 to n=1.50) instead of using uniform refractive index materials. This parameter change enables directional photon emission towards the substrate, significantly improving detection efficiency while maintaining analyte mobility in liquid.
2Quantity of substance
If multiple analytes are detected simultaneously, then statistical average can be obtained, but the rich dynamic information of individual components is erased
Solution Approach 1:
The patent creates a localized detection zone using the optofluidic antenna structure with specific refractive index gradient. This local quality enhancement allows single-molecule sensitivity within the antenna volume, enabling detection of individual analyte dynamics even when multiple analytes are present in the overall sample, thus preserving rich dynamic information.
3Device complexity
If standard optical microscopes are used, then the setup is simple and accessible, but the temporal resolution is limited by the number of photons detectable in a given time interval
Solution Approach 1:
The patent segments the detection function by introducing a specialized optofluidic antenna component that works in conjunction with standard microscopes. The antenna structure (liquid layer with refractive index gradient) separates the photon enhancement function from the imaging function, allowing temporal resolution improvement while maintaining compatibility with existing microscope equipment.
4Measurement precision
If plasmonic nano-antennas are used to enhance photon emission rate, then the Purcell effect can be utilized, but the observation volume becomes sub-diffraction limited which is problematic for high concentration samples
Solution Approach 1:
The patent transitions from the sub-diffraction limited volume of plasmonic nano-antennas to a diffraction-limited volume by using a liquid layer antenna with refractive index gradient. This dimensional change in the antenna approach allows the observation volume to match the diffraction limit, enabling detection of both single molecules and high concentration samples (micro to millimolar regime) with appropriate temporal resolution.
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 optofluidic antenna device achieves a 2.5-fold increase in photon collection efficiency and up to a 100-fold increase in observation time per analyte, while being compatible with various sample types and easy to implement with existing equipment.
Implementation Method 1
A thickness of the liquid layer between the first and second liquid surfaces and refractive indices of the substrate and the liquid layer are selected such that an optofluidic antenna is formed, which is capable of directing the sample light mainly towards the substrate
Data Source
AI summary
An optofluidic antenna device (100) for shaping a light field of sample light emitted or scattered by a sample (1) comprises a substrate (10) and a liquid layer (20) being supported by the substrate (10) and being arranged for accommodating the sample (1) to be investigated between a first liquid surface (21) facing to the substrate (10) and a second liquid surface (22) opposite to the first liquid surface (21), wherein a thickness of the liquid layer (20) between the first and second liquid surfaces (21, 22) and refractive indices of the substrate (10) and the liquid layer (20) are selected such that an optofluidic antenna is formed, which is capable of directing the sample light mainly towards the substrate (10), and a gas volume (30) is arranged above the liquid layer (20), so that the second liquid surface (22) is formed as a liquid-gas-interface. Furthermore, a measuring apparatus (300), that comprises the optofluidic antenna device (100), and a method of detecting at least one photon emitted or scat-tered from a sample (1), in particular a single analyte in a liquid, are described.