Electro-Optically Induced Force System for Scalable Laser Manipulation
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Solution Overview
Problem
Current techniques for manipulating objects using laser light are limited by the risk of damage to the sample due to high peak intensity, inefficient energy coupling, and are not scalable for larger samples, as they often rely on electric charge polarization or photon momentum transfer, which is inefficient.
Innovation Solution
The electro-optically induced force system mimics the repulsion between like-charged wires by using a laser beam to interact with an electric field, allowing for scalable manipulation without focusing the laser on the sample and avoiding electric charge polarization, by varying the electric field near the wire to achieve a net force over time through phase modulation and field interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If laser light is focused on the target sample to induce electric charge polarization, then manipulation force can be applied, but the sample can be overheated, ionized or destroyed due to high peak intensity
Solution Approach 1:
The patent introduces an intermediate medium (gas or vacuum environment) between the laser and the sample. Instead of directly focusing laser light on the sample to create electric charge polarization, the system uses the intermediate medium to facilitate momentum transfer from laser photons to the sample, thereby reducing the harmful thermal and ionization effects while maintaining manipulation capability
Solution Approach 2:
The patent replaces the traditional optical-mechanical interaction mechanism (direct laser focusing creating electric charge polarization) with a different physical mechanism involving photon momentum transfer through an intermediate medium. This substitution allows force application without the harmful effects of high peak intensity direct coupling
2Force
If laser light is focused on the target sample, then manipulation force can be induced, but the length of interaction is limited, reducing efficiency of laser energy coupling into translation
Solution Approach 1:
The patent transitions from a point-focused interaction (zero-dimensional or one-dimensional interaction length) to a distributed interaction along a path or volume. By using an intermediate medium and non-focused laser illumination, the interaction extends over a longer spatial dimension, allowing more laser energy to be coupled into the sample's translation while maintaining effective force application
3Ease of manufacture
If photon momentum transfer is used for manipulation, then no electric charge polarization is required, but the process is extremely inefficient as photons have very little mass
Solution Approach 1:
The patent introduces an intermediate medium (gas molecules or vacuum conditions) that acts as a mediator between the low-mass photons and the sample. This intermediate medium enables more efficient momentum transfer by providing a mechanism for photons to impart their momentum to the sample through collisions or interactions with the medium, thereby overcoming the inefficiency of direct photon-sample interaction
Solution Approach 2:
The patent employs periodic or oscillating laser illumination patterns that create time-varying momentum transfer. By using modulated or pulsed laser beams interacting with the intermediate medium, the system achieves more effective momentum coupling to the sample, improving manipulation efficiency while avoiding direct electric charge polarization
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 approach enables efficient and scalable manipulation of larger samples by integrating force over longer distances, improving energy utilization and increasing the mass that can be manipulated, with potential to lift tons using arrays of low-cost, high-power lasers.
Implementation Method 1
The manipulation of mass through the use of laser light has found many applications as laser technology has evolved... coherent control of chemical reactions is becoming possible... Laser atom or molecule trapping has seen a great deal of activity... Optical tweezers have been used to stretch single strands of DNA and manipulate chromosomes inside cell nuclei and move entire cellular organelles without destroying the cell wall
Implementation Method 2
Other techniques rely on the transfer of photon momentum in the optical scattering process, but this is extremely inefficient as photons at commonly accessible wavelengths have very little mass
Data Source
AI summary
A technique is disclosed for electro-optically inducing a force to fabricated samples and/or devices with laser light. The technique uses the interaction of the oscillating electric field of the laser beam in opposition with the electric field produced by an appropriate electric charge carrier to achieve a net repulsive (or attractive) force on the component holding the electric charge. In one embodiment, force is achieved when the field near the charge carrier is modulated at a subharmonic of the electric field oscillation frequency of the laser and the relative phases of the light field and electric charge carrier field are controlled to provide optimal repulsion/attraction. The effect is scalable by applying the technique to an array of charge carrier fields sequentially as well as using higher power lasers and higher carrier field voltages.