Photopyroelectric Tweezer

 


There is huge potential for the future of optical tweezers. However, they are not known for being practical. This is because they require low conductive media, additional electric sources and high intensity laserbeams.

A new study was released in a journal called The Innovation. The team was led by Dr Du Xuemin from Shenzhen Institutes of Advanced Technology (SIAT) of the Chinese Academy of Sciences. The researchers used a new photopyroelectric tweezer (PPT). The new tweezer combines both the light and electric fields. The PPT can be manipulated into a variety of positions.

The PPT team claims it is made up of two components. One component of the PPT is a near infrared (NIR) spectrum laser light source. The other important component includes a liquid base and a photopyroelectric substrate.

The substrate is made up of a superhydrophobic ferroelectric polymer layer. The substrate is also made up of a Ga-In liquid metal microparticle embedded polycomposite and a lubricated slippery layer. The polymer layer creates a surface charge by way of the photopyroelectric effect. The lubricated layer decreases motion, resistance and contamination. The lubricated layer also stops charge screening caused by conductive media.

Dr. Xuemin reports, “The innovation lies in the rational design of the photopyroelectric substrate, which efficiently generates charges and the lubricant layer that prevents charge screening by conductive media. This design imparts unparalleled flexibility and adaptability for diverse object manipulation.”

The novel tweezers can move objects made of various materials like metal, inorganic material, or polymers. The PPT can also manipulate different phases, like solids, liquids, bubbles, and even shapes like cuboid, wire, and spheres.


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