Tuning-Fork Near-Field Probe for Terahertz Spectral Analysis
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Solution Overview
Problem
Conventional near-field microscopes face challenges in achieving nanometer-level resolution due to limitations in diffraction, background scattering signals, and multiple reflections, which complicate spectral analysis in the terahertz frequency band.
Innovation Solution
A tuning-fork based near-field probe with a wire-shaped nano-probe, designed to minimize background scattering by delaying multiple reflections and stabilize mechanical vibrations, allowing for precise spectral measurement by focusing terahertz pulses and separating scattered waves from the tip of the probe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional near-field probe is used, then the probe can detect near-field signals, but background scattering signals from portions except the tip generate noise that complicates spectral analysis
Solution Approach 1:
The patent extracts and eliminates the harmful antenna effect from the probe structure. By designing the probe as a tuning-fork type where the nano-probe units are positioned at the tips and the structure is configured to minimize electromagnetic radiation from non-tip portions, the background scattering signals are effectively removed while preserving the near-field detection capability at the probe tips.
Solution Approach 2:
The patent converts the potential harmful antenna effect into a beneficial localized field confinement. By carefully designing the probe structure with specific dimensions and configuration, the electromagnetic field is confined to the immediate vicinity of the probe tips, transforming what could be radiative loss into enhanced near-field localization that improves measurement precision.
2Stability of the object's composition
If the probe structure is extended to improve mechanical stability, then vibration stability improves, but multiple reflections occur that complicate signal interpretation
Solution Approach 1:
The patent employs a dynamic tuning-fork structure that utilizes controlled mechanical vibration at specific frequencies. The probe is designed to vibrate in a controlled manner, and the measurement system synchronizes with this vibration frequency using lock-in detection, thereby achieving stable measurements while the dynamic vibration prevents static multiple reflection issues.
Solution Approach 2:
The patent uses periodic mechanical vibration of the tuning-fork probe at its resonant frequency. This periodic action allows the use of lock-in amplification techniques where signals are detected at specific phases of the vibration cycle, effectively filtering out non-periodic noise and multiple reflection artifacts while maintaining stable measurement conditions.
3Adaptability or versatility
If a broadband light source is used to achieve wide wavelength band measurement, then spectral coverage is improved, but multiple reflections and background signals increase
Solution Approach 1:
The patent extracts and removes the antenna effect that causes multiple reflections across the broadband spectrum. By configuring the probe structure to eliminate radiative losses, the system can utilize broadband light sources effectively without the harmful multiple reflections that would otherwise complicate spectral analysis across wide wavelength bands.
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 solution enables precise measurement of scattered waves with reduced background interference, allowing for accurate broadband spectral analysis with improved resolution and separation of transient signals in the terahertz frequency band.
Implementation Method 1
a wire-shaped nano-probe downward attached to a one-side end of the second electrode and configured to vibrate in a perpendicular direction with respect to a sample
Implementation Method 2
an end part for localizing the receive terahertz pulse to interact with the sample, and scattering a terahertz pulse, into air, which has obtained local information of the sample in the localizing procedure
Implementation Method 3
designed to minimize background scattering by delaying multiple reflections and stabilize mechanical vibrations, allowing for precise spectral measurement by focusing terahertz pulses and separating scattered waves from the tip of the probe
Data Source
AI summary
The present invention is provided to remove scattering from other parts, except for an end part of a nano-probe, in a near-field microscope, and to enable a spectral analysis by delaying the generation of multiple reflections caused through the shaft of the nano-probe. A first characteristic of the present invention is to temporally delay generation of multiple reflections by manufacturing a probe portion to have a predetermined length or more in a tuning-fork based near-field probe. A second characteristic of the present invention is to provide a near-field microscope which includes a tuning-fork based near-field probe having a structure as above, and can measure a time-domain transient reaction of a scattered wave. A third characteristic of the present invention is to provide a method for performing a spectral analysis on a time-domain signal measured by the near-field microscope.