Probe-Based Bidirectional Electrophoretic Force Optical Trap Loading
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Solution Overview
Problem
Existing optical trap loading methods struggle to achieve stable capture of particles in high vacuum environments and are not compatible with vacuum optical trap systems, often requiring complex operations and additional damping mechanisms to manage particle escape due to airflow and other factors.
Innovation Solution
A probe-based bidirectional electrophoretic force optical trap loading method and device that detaches and captures particles using a micro-scale probe in vacuum or air environments, applying a reverse electric field to desorb particles from the probe and adjust their speed for stable capture within an optical trap, utilizing a power supply, displacement adjuster, and control unit to manage voltages and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If vibration desorption method is used to detach particles from substrate, then particles can be released into free space, but the drive capability requirement increases significantly for microns-sized particles and below
Solution Approach 1:
The patent replaces the mechanical vibration desorption method with an electrophoretic force-based release mechanism. Instead of using high-frequency mechanical vibration of piezoelectric ceramics, the invention uses electric fields to generate electrophoretic forces that detach and propel particles. This substitution eliminates the need for high-power piezoelectric actuators while achieving controlled particle release.
Solution Approach 2:
The invention changes the physical mechanism from mechanical vibration to electrical field-based electrophoresis. By controlling electric field parameters (voltage, polarity switching), the system achieves particle release without requiring high mechanical drive capability, thus resolving the power requirement issue for microns-sized and smaller particles.
2Speed
If spray suspension method is used for nanoparticle release, then particles can be scattered into free space, but highly volatile solutions must be used which complicates the system
Solution Approach 1:
The patent replaces the spray suspension method with an electrophoretic release mechanism. Instead of using highly volatile solutions and spray atomization, the invention uses electric fields to directly detach and propel nanoparticles from the substrate. This eliminates the need for volatile solvents and complex spray control systems while achieving rapid particle scattering.
3Adaptability or versatility
If laser acoustic release method is used to release particles, then particles with different sizes can be released in vacuum or air environment, but the device complexity increases
Solution Approach 1:
The patent replaces the laser acoustic release method with an electrophoretic force-based release mechanism. Instead of using high-energy pulsed lasers to generate acoustic waves, the invention uses controlled electric fields to detach and propel particles of various sizes. This substitution maintains versatility across particle sizes and environments while significantly reducing device complexity.
4Speed
If air damping is used to reduce optical loading speed of particles, then particles can be decelerated for capture, but the method is only able to be carried out under normal pressure
Solution Approach 1:
The patent replaces air damping with electrophoretic force-based deceleration. Instead of relying on air molecules to slow down particles, the invention uses controlled electric fields to generate retarding electrophoretic forces that decelerate particles directly. This allows the system to operate in vacuum environments where air damping is absent, significantly improving vacuum compatibility.
5Speed
If particles are released with initial velocity from carrier surface, then capture speed increases, but additional dissipation mechanisms are required to achieve stable capture
Solution Approach 1:
The patent replaces external damping mechanisms with electrophoretic force-based speed control. Instead of using air damping or other dissipation mechanisms, the invention uses controlled electric fields to generate retarding electrophoretic forces that naturally decelerate particles to optimal capture speeds. This eliminates the need for additional damping components while maintaining stable capture.
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
Enables precise and stable capture of particles in vacuum or air environments, facilitating the development of integrated optical trap systems and reducing operational complexity by controlling particle speed and position for effective capture within the optical trap.
Implementation Method 1
detaching target particles from an upper electrode plate and capturing the target particles by a micro-scale probe based on a bidirectional electrophoretic force
Implementation Method 2
forming a reverse bidirectional electrophoretic force by applying a reverse electric field between the probe with the target particles and the upper electrode plate, wherein the reverse electric field is applied during a polar relaxation time of the target particles, and desorbing the target particles from the probe
Implementation Method 3
adjusting a speed of the desorbed target particles through the electric field at which the optical trap is able to capture the desorbed target particles
Data Source
AI summary
A probe-based bidirectional electrophoretic force optical trap loading method includes steps of (1) detaching target particles from an upper electrode plate and capturing the target particles by a micro-scale probe based on a bidirectional electrophoretic force; (2) moving the probe with the target particles over an optical trap, applying a reverse electric field between the probe and the upper substrate electrode plate which is applied during a polar relaxation time of the target particles, and desorbing the target particles from the probe; and (3) turning on the optical trap, applying an electric field between the lower electrode plate and the upper electrode plate, adjusting the speed of the desorbed target particles through the electric field at which the optical trap is able to capture the desorbed target particles and the desorbed target particles moving to the effective capture range of the optical trap.