Quantum Dot Optical Fiber Probe for Nano-Scale Temperature Imaging
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Solution Overview
Problem
Current temperature measurement technologies, such as thermocouples and traditional optical methods, face limitations in spatial resolution and interference, making it difficult to achieve high-resolution, non-destructive, nano-scale temperature characterization, especially in electronic devices.
Innovation Solution
A quantum-dot-based measuring system using an optical fiber probe with a tapered tip and temperature-sensitive quantum dots, which allows for high-resolution temperature detection and imaging by emitting excitation light and collecting optical signals through a spectrometer, enabling simultaneous surface topography and temperature distribution imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical devices are used for temperature measurement, then the measurement can be performed non-destructively with fast response, but the spatial resolution is limited to micron-scale due to the diffraction limit
Solution Approach 1:
The patent introduces quantum dots as an intermediary substance attached to the optical fiber probe tip. These quantum dots serve as a mediator that enables near-field optical interaction with the sample, allowing temperature measurement with spatial resolution beyond the diffraction limit by utilizing the quantum confinement effects and size-tunable optical properties of quantum dots
Solution Approach 2:
The patent changes the physical parameters of the measurement system by using quantum dots with size-tunable bandgap and optical properties. By controlling the size and composition of quantum dots, the system achieves variable emission wavelengths and enhanced near-field interaction, enabling sub-diffraction resolution temperature measurement
2Measurement precision
If a single quantum dot is used to modify the tip for near-field optical measurement, then the analysis region is limited to a single quantum dot size area, but this provides nano-scale spatial resolution
Solution Approach 1:
The patent segments the quantum dot coverage on the probe tip into multiple discrete regions, allowing different areas of the tip to be functionalized with quantum dots at different positions. This segmentation enables the system to analyze multiple distinct regions on the sample surface while maintaining nano-scale spatial resolution for each region
3Illumination intensity
If laser is directly irradiated from the objective lens to the sample surface for excitation, then the light spot is large, but the excitation power at the tip is weak
Solution Approach 1:
The patent uses the optical fiber probe with quantum dots as an intermediary delivery system. The excitation light is transmitted through the optical fiber to the tip where quantum dots are attached, concentrating the excitation power precisely at the tip-sample interaction region rather than illuminating a large area from the objective lens, thereby achieving high excitation power density at the nanoscale tip location
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
This system achieves high-resolution temperature measurement and imaging at the nano-scale with reduced interference, breaking the diffraction limit and allowing for comprehensive analysis of temperature distribution and surface morphology without damaging the sample.
Implementation Method 1
Quantum dots have the characteristics of long fluorescence lifetime, good biocompatibility, and luminescence properties which are very sensitive to the surrounding environment
Implementation Method 2
The optical fiber probe includes a tail end and a tapered tip, and the tapered tip of the optical fiber probe is attached with one or more quantum dots, and the excitation light is injected from the tail end of the optical fiber probe and emitted from the tapered tip to a sample to be detected
Implementation Method 3
The objective lens is to collect optical signal reflected by the sample
Data Source
AI summary
A quantum-dot-based measuring system is disclosed. The quantum-dot-based measuring system includes a laser to emit excitation light, an optical fiber probe including a tail end and a tapered tip, and the tapered tip of the optical fiber probe is attached with one or more quantum dots, and the excitation light is injected from the tail end of the optical fiber probe and emitted from the tapered tip to a sample to be detected, an objective lens to collect optical signal reflected by the sample and a spectrometer to receive the optical signal.