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An ultrathin conformai skin cloak that can hide three-dimensional objects of arbitrary shape in the visible wavelength range is demonstrated experimentally. Using the concept of reflection phase manipulation with metasurface nanoantennas, we restored not only the wavefront, but also the phase of the reflected light.
Metamaterials enable the engineering of refractive index into the intriguing negative regime. Such negative index metamaterials (NIMs) can give rise to unique optical properties like negative refraction and backward waves. Similarly, zero index metamaterials (ZIMs) are widely studied recently for they open a new route to realize uniform phase distribution and coherent coupling even within a large...
Exploration of the interplay between gain and loss in optical metamaterials can lead to novel device functionalities. Here we demonstrate a single-mode laser with unique cavity mode manipulation capability based on thresholdless parity-time symmetry breaking.
The interplay between gain and loss in optical metamaterials can lead to novel device functionalities. Here we demonstrate a single-mode laser with unique cavity mode manipulation capability based on thresholdless parity-time symmetry breaking.
When transition metal dichalcogenide (TMDC) crystals are thinned to monolayers, they undergo an indirect to direct bandgap transition, enabling rich electroluminescent and photoluminescent behaviors. Coupling and integration of TMDC monolayers with photonic crystal and distributed Bragg reflector microcavities have recently been reported with Purcell enhancement of spontaneous emission and strong...
We experimentally demonstrate a three-dimensional ultra-thin metasurface carpet cloak can cover on an arbitrary-shaped object and make it undetectable by the visible light owing to the phase control capability of the metasurface.
Exploration of the interplay between gain and loss in optical materials can lead to novel device functionalities. Here we demonstrated a single-mode laser based on parity-time symmetry breaking.
Phase-matching is critical for coherent nonlinear optical processes, allowing nonlinear sources to combine constructively, resulting in more efficient emission. We experimentally demonstrate phase mismatch-free nonlinear propagation in a bulk zero index metamaterial.
Piezoelectric systems are viewed as a promising approach to energy harvesting from environmental vibrations. The energy harvested from real vibration sources is usually difficult to estimate analytically. Therefore, it is hard to optimise the associated energy harvesting system. This work investigates the optimisation of a piezoelectric cantilever system using a genetic algorithm based approach with...
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