In contrast to bulky cloaks with volumetric index variation, our device is only 80 nanometer (about one-ninth of the wavelength) thick and potentially scalable for hiding macroscopic objects.
#Invisible cloak hong kong university skin#
To view Dr Jensen Li’s personal Croucher profile, please click here.įor details of the Croucher Fellowships for Postdoctoral Research, please click here. The skin cloak comprises a metasurface with distributed phase shifts rerouting light and rendering the object invisible. Li has been appointed senior lecturer in the University of Birmingham since March 2013. From 2009 to 2013, he was an assistant professor at the City University of Hong Kong before his current position. He moved to the University of California at Berkeley as a postdoctoral researcher at the end of 2007. From 2005 to 2007, he received the Croucher Foundation Postdoctoral Fellowship to work with Sir John Pendry in Imperial College London. Li received his B.Eng in electrical and electronic engineering from The University of Hong Kong and completed his doctoral studies at the Hong Kong University of Science and Technology in 2004.
#Invisible cloak hong kong university how to#
Li and his experimental collaborators have recently demonstrated metamaterials undergoing Parity-time phase transition, metasurfaces manipulating structured light, and have proposed how to use metamaterials to realise synthetic gauge field for photon. These metamaterials now gradually become a generic platform for us to investigate different wave phenomena that cannot be easily realised previously,” said Li. “The implication of the usage of metamaterials to realise an invisibility cloak is far-reaching. Li’s current research focuses on how metamaterials can be used to control waves in unexpected ways by exploring different strange wave phenomena and their possible applications. More work was done to improve the carpet cloak so that it works at optical frequencies, theirs being the first optical carpet cloak published in 2010. Li then teamed up with experimentalists at UC Berkeley to work out the detailed design and construction of this cloak, working at infrared frequencies, which was published in 2009. It cancels out all the original scattering from the object, making us to perceive a flat ground again,” explained Li.
This cloak is like a carpet placed on top of the object.
As this initial invisibility cloak worked only in the microwave spectrum, Li proposed a new strategy in 2008, called the carpet invisibility cloak. Since the first invisibility cloak reported in 2006, scientists have been engineering refractive indices in metamaterials to control light to make the cloak work for all angles and multiple viewers.
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