150 research outputs found
Nonlinear metal-dielectric nanoantennas for light switching and routing
We introduce a novel hybrid metal-dielectric nanoantenna composed of
dielectric (crystalline silicon) and metal (silver) nanoparticles. A
high-permittivity dielectric nanoparticle allows to achieve effective light
harvesting, and nonlinearity of a metal nanoparticle controls the radiation
direction. We show that the radiation pattern of such a nanoantenna can be
switched between the forward and backward directions by varying only the light
intensity around the level of 11 MW/cm, with the characteristic switching
time of 260 fs.Comment: 9 pages, 5 figures, submitted to New J. Phy
Thermal Emission Control via Twist Tuning of Embedded Eigenstates
The field of thermal emission engineering shows great potential for various
applications, such as lighting, energy harvesting, and imaging, using natural
or artificial structures. However, existing structures face challenges in
fabrication or do not provide the necessary degree of control over key
parameters such as emission intensity, spectral composition, and angular
distribution. To address these limitations, we propose a novel approach that
leverages in-plane hyperbolic response, embedded eigenstates enabled by
epsilon-near-zero, and exceptional tunability through twisting in {\alpha}-MoO3
heterostructures. By adjusting the twist angle, we can manipulate the system's
properties, transforming it from a near-perfect reflector to a perfect
absorber. This enables us to exert control over thermal emission power,
spanning an order of magnitude. Furthermore, our research has uncovered a
significant angular dependence of thermal emission, which varies with relative
rotation
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