Photonic Calorimeter Nanohole Array Sensing
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Solution Overview
Problem
Conventional calorimetry techniques face limitations in accurately measuring energy changes and thermodynamic properties of biological and chemical reactions due to their size and sensitivity, particularly in early drug discovery and protein unfolding studies.
Innovation Solution
A Photonic Based Differential Calorimeter (PBDSC) utilizing a photonic sensor with a nanohole array to measure extraordinary optical transmission (EOT) changes, allowing for precise temperature and concentration measurements in a small, multiplexed device, enabling energy release analysis during heat application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional temperature sensors (thermocouples, thermopiles, thermistors) are used in calorimetry, then the device structure is simple and easy to manufacture, but the measurement precision and sensitivity are insufficient for detecting small energy changes in biological reactions
Solution Approach 1:
The patent replaces conventional electrical temperature sensors (thermocouples, thermopiles, thermistors) with an optical sensing system based on nanohole arrays and photodetectors. This substitution of mechanical/electrical sensing with optical sensing enables ultra-sensitive detection of temperature changes and energy releases in calorimetry experiments, achieving picowatt-level sensitivity while maintaining device feasibility through integrated photonic chip architecture
Solution Approach 2:
The patent changes the sensing parameter from electrical resistance/voltage measurements to optical transmission measurements. By measuring changes in optical transmission through nanohole arrays that are thermally coupled to the sample chamber, the system achieves enhanced sensitivity to temperature and concentration changes, enabling detection of small energy changes in biological reactions
2Quantity of substance
If conventional calorimetry devices are used, then the device size is large, but the sample volume required is excessive and testing time is prolonged
Solution Approach 1:
The patent divides the calorimetry measurement function into integrated photonic chip components, including nanohole arrays, microfluidic channels, and photodetectors fabricated on a single substrate. This segmentation and integration enables the use of minimal sample volumes (nanoliter scale) while maintaining measurement capability, and allows parallel processing through multiplexed sensor arrays, thereby increasing productivity
Solution Approach 2:
The patent transitions from bulk sample measurement to surface-based measurement using nanohole arrays fabricated on a photonic chip. This dimensional change from three-dimensional bulk to two-dimensional surface measurement enables ultra-small sample volumes to be effectively utilized while maintaining high sensitivity through the enhanced optical interaction at the nanoscale
3Speed
If conventional temperature sensing methods are used, then the response time is slow, but the ability to capture rapid energy release events is insufficient
Solution Approach 1:
The patent replaces slow electrical temperature sensors with optical sensing based on photodetectors measuring transmission changes through nanohole arrays. Optical detection inherently operates at higher speeds than electrical thermal sensors, enabling rapid capture of energy release events while maintaining precision through the sensitive optical transmission measurements that respond immediately to temperature and concentration changes
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 PBDSC provides ultra-sensitive and rapid energy release measurements, improving the detection of energy changes in biological samples, such as protein unfolding and phase changes, with a significant reduction in sample volume and testing time, enhancing drug discovery and pharmaceutical applications.
Implementation Method 1
uses a photonic sensor to determine a change in extraordinary optical transmission (EOT) through an array of nanoholes to measure temperature (T) and concentration change ([C])
Implementation Method 2
transmission of light through plural Nano Hole Array (NHA) sensors coupled to the test chamber is measured to obtain a series of extraordinary optical transmission (EOT) measurements
Implementation Method 3
applying heat to the test chamber with the sample provided therein, the heat being applied at a known heat rate
Data Source
AI summary
A method for calorimetry includes providing a sample to a test chamber and applying heat to the test chamber with the sample provided therein, the heat being applied at a known heat rate. In a synchronized manner with respect to applying heat to the test chamber, transmission of light through plural Nano Hole Array (NHA) sensors coupled to the test chamber is measured to obtain a series of extraordinary optical transmission (EOT) measurements. A calorimetry measurement is calculated as a function of the heat rate and the series of EOT measurements, the calorimetry measurement being indicative of energy released as a result of the sample undergoing a change during the application of heat to the test chamber. Samples, including fluids and solids, can be transferred into the test chamber by a pump or other suitable means. Example test chambers include a microchannel injection cell and a co-flow reactor microchannel.