Tuesday , August 16 2022

Physicists show a new device for manipulating and moving light objects



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Physicists show a new device for manipulating and moving light objects.

Credit: Wits University

When you illuminate your hand, it does not feel much, except for the slightest heat generated by the beam. The world measured in nano or micro size will be a powerful manipulation tool that can be used to shift light-emitting objects while lighting the same light.


From Structured Light, a physics school at the Witwatersrand University in Johannesburg, researchers have been able to use the laser light, control and manage minute objects like human cells, small particles in small chemistry, or work on future chip devices.

However, even though there is no new technique called holographic optical retention and daggers, researchers at Wits Research have found the best way to use the full power of light, including previously unused vector light. This is the first vector holographic trap.

"Previously, holographic traps were limited to certain light classes (scalar light), so we are excited to open the whole device, including all classes of light, including all older retention devices," says Professor Andrew Forbes, Co-operation and Honorary Professor at the Physics School. he heads the Wits Structured Light laboratory.

"We have shown the first vector holographic optical shock and spinning system, which allows the micrometer to hold, for example, biological cells, with only light and manipulation."

Credit: Wits University

The final device can capture just a few details and turn it into the light vector status. The experiments were carried out by Nkosi Bhebe as part of the doctoral studies. Published in work Natureon-line magazine, Scientific reports.

In normal optical retention and drainage systems, light is very intense in small quantities, such as biological cells, for example. In this small scale (typically micro- or nanometers), the forces that come into the light are important, so particles are controlled by light and then controlled. As the light shifts, particles move with it. This idea won the Nobel Prize Physics in 2018 by American scientist Arthur Ashkin. Initially, the light was controlled mechanically by stages and mirrors, but later developed through light motion around the holographic light, ie, using computer holograms, controls the particles and controls the light without moving parts. Until now, such holographic traps can only be used by special classes of laser beams, called scalar rays.

In its article titled "Vector Holographic Optical Trap", researchers have shown how to create and control any light-colored holographic pattern, and then used it to form a new optical hold and twist device.

"In particular, the device can work with conventional laser beams, as well as complex vector beams. Vector beams are very topical and find many applications, but so far, vector holographic traps are not possible," says Forbes.

Wits researchers will demonstrate new traps through the holographic management of scalar and vector beam on the same device by introducing a new device to the community by upgrading modern technologies. The team expects that the new device will be useful for experiments in micro and nano worlds, including unified cell research in biology and medicine, small chemical reactions, fundamental physics, and future microprocessors.

Before showing holograms that hundreds of special light patterns could be created, the study combines holographic control with the use of optical capture and filming.


Further research:
Scientists use the technique of creating new light rays from the synchrotron beam

More information:
Nkosiphile Bhebhe and others. Vector holographic optical trap, Scientific reports (2018). DOI: 10.1038 / s41598-018-35889-0

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