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Photonic metamaterials and metasurfaces
Photonic metamaterials and metasurfaces are advanced materials that are designed to have unusual and often exotic optical properties, such as the ability to manipulate the path of light or control its polarization in novel ways. These materials are composed of artificially engineered structures (meta-atoms) that are designed to interact with light at the nanoscale. We have proposed a novel concept of Huygens meta-atom to manipulate light wavefront, designed an asymmetric optical transmission device and a polarization switched multifunctional metasurface for light focusing and surface-plasmon-polariton wave excitation. We also demonstrated the polarization controlled dual window plasmon-induced transparency.
Pico-photonic/electronic metrology
Optical nanometrology, which refers to the measurement and characterization of nanoscale features using optical techniques, presents a number of challenges due to the small size of the structures being measured and the limitations of light as a measurement tool. These include: Diffraction limited resolution; Low signal-to-noise ratio due to the small amount of light scattered by the sample; Surface effects at the nanoscale can become dominant which can interfere with the accuracy of measurements; Data analysis from optical nanometrology measurements can be complex. To address these challenges, we have developed a hyperspectral motion visualization technique combining picometric displacement sensitivity with the nanometric spatial resolution of an SEM and reported on the first observation of short-timescale ballistic motion in the flexural mode of a nano-membrane cantilever. For the first time, we are able to localize a single nanowire with an accuracy of 100 pm, this is achieved through deep learning analysis of the scattering of topologically structured light.
Nano-optomechanics
Nano-optomechanics is a field of research that explores the interactions between light and mechanical motion at the nanoscale. It involves the study of mechanical systems that can be coupled to optical cavities, which allows for the manipulation of mechanical motion with light and the detection of very small mechanical displacements using light. Applications of nano-optomechanics include ultra-sensitive force and mass sensing, quantum information processing, and the development of new types of optical devices, such as ultra-compact and low-power optical switches and modulators. We have characterised thermal fluctuations in the optical properties of metamaterials. We have demonstrated the optically resonant excitation and detection of gigahertz vibrational modes in a nanoscale metasurface. A photonic metamaterials analogue of a continuous time crystal was also demonstrated based on nano-optomechanical metamaterials.
Detection Spin of Electron Bubble
An electron bubble It is a kind of quantum impurity within liquid helium 4. An electron bubble is the empty space created around a free electron in a cryogenic gas or liquid, such as neon or helium. They are typically very tiny, about 2 nm in diameter at atmospheric pressure. Although EBs have been studied very thoroughly, but one thing that has never really been measured, is the spin of that electron, which is supposed to be extremely pristine. And they’re supposed to offer an intriguing possibility for certain kinds of qubits. And to date nobody has been able to measure the spins of electrons either in bubbles or on the surface of helium just for the lack of good control and readout. The electron bubble in superfluid helium has two degrees of freedom that may offer exceptionally low dissipation: the electron’s spin and the bubble’s motion. If these degrees of freedom can be read out and controlled with sufficient sensitivity, they would provide a novel platform for realizing a range of quantum technologies, such as quantuam computing and sensing, and for exploring open questions in the physics of superfluid helium.
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