An omnidirectional nanophotonic solar selective absorber is fabricated on a large scale using template-stripping method. The nanopyramid nickel structure achieves an average absorptance of 95% at wavelength range below 1.3 μm and low emittance less than 10% >2.5 μm.

We present a review of 3D point cloud processing and learning for autonomous driving. As one the most important sensors in vehicles (AVs), lidar collect clouds that precisely record external surfaces objects scenes. The tools are critical to map creation, localization, perception modules an AV. Although much attention has been paid data collected from cameras, such as images videos, increasing number researchers have recognized importance significance driving proposed algorithms exploit...

In the near field, radiative heat transfer can exceed prediction from Planck's law by several orders of magnitude, when interacting materials support surface polaritons in infrared range. However, if emitter and absorber are made two different materials, which polariton resonances at frequencies, mismatch between resonance frequencies will drastically reduce near-field transfer. Here, we present a broadband thermal emitter/absorber based on hyperbolic metamaterials, significantly enhance...

Although blackbody radiation described by Planck's law is commonly regarded as the maximum of thermal radiation, energy transfer in near-field can exceed limit due to contribution from evanescent waves. Here, we demonstrate experimentally a broadband extraction device based on hyperbolic metamaterials that significantly enhance transfer. The extractor made does not absorb or emit any but serves transparent pipe guiding radiative emitter. At same gap between an emitter and absorber, observe...

Collaborative 3D object detection exploits information exchange among multiple agents to enhance accuracy of in presence sensor impairments such as occlusion. However, practice, pose estimation errors due imperfect localization would cause spatial message misalignment and significantly reduce the performance collaboration. To alleviate adverse impacts errors, we propose CoAlign, a novel hybrid collaboration framework that is robust unknown errors. The proposed solution relies on agent-object...

Thermal radiation with a narrow-band emission spectrum is of great importance in variety applications such as infrared sensing, thermophotovoltaics, cooling, and thermal circuits. Although resonant nanophotonic structures metamaterials nanocavities have been demonstrated to achieve the emission, maximizing their power toward perfect still remains challenging. Here, based on recently developed quasi-normal mode theory, we prove that from nanoscale transmission line resonator can always be...

In this letter, we demonstrate theoretically and experimentally that bulk silicon can be employed to overcome the challenge of tuning near field radiation. Theoretical calculation shows nanoscale radiation between dioxide tuned by changing carrier concentration silicon. Near measurements are carried out on multiple samples with different doping concentrations. The measured conductance agrees well theoretical predictions, which demonstrates a range from 2 nW/K 6 at gap ∼60 nm.

Metasurfaces, a new class of planar metamaterial, are attracting intensive attention due to their exceptional abilities mold light. In this work, novel metasurfaces based on graphene nanoribbons developed control the wavefront infrared The results show that these can create phase discontinuities between incident and scattered light, covering range from 0 about π while maintaining relatively large amplitude for A cylindrical flat lens anomalous refraction nanoribbon also demonstrated, paving...

The electron transition between oxygen vacancies and cationic shortens the band gap of KDP crystals.

As one emerging plasmonic material, graphene can support surface plasmons at infrared and terahertz frequencies with unprecedented properties due to the strong interactions between low-frequency photons. Since exist in regime, they be thermally pumped (excited) by evanescent waves emitted from an object. Here we show that thermal efficiently excited have monochromatic tunable spectra, thus paving a way harness energy for devices. We further demonstrate ``thermal information communication''...

We present a review of 3D point cloud processing and learning for autonomous driving. As one the most important sensors in vehicles, light detection ranging (LiDAR) collect clouds that precisely record external surfaces objects scenes. The tools are critical to map creation, localization, perception modules an vehicle. While much attention has been paid data collected from cameras, such as images videos, increasing number researchers have recognized importance significance LiDAR driving...

The Fe K 2+ defect introduces two states (at 2.4 eV and 6.6 eV) into the bandgap of KDP crystal as well absorption peaks at around 278 nm in xy plane.

The non-critical phase matching (PM) conditions of deuterated dihydrogen phosphate (DKDP) crystal are investigated in this paper for fourth harmonic generation (FHG) Nd:YAG and Nd:glass lasers, which include exterior angle deviation, deuterium content PM temperature. DKDP crystals different were grown from aqueous solutions cut type-I phase-matching with the direction at 90° to Z axis (θ = 90°) 45° X (Ф 45°). samples measured FHG 1064 nm 1053 nm, respectively. that supports experiments is...

We propose a device for reproducible achievement of enormous enhancement local electric field intensities. In each device, metallic spiral ring grating is employed efficient excitation surface plasmon resonance in the tiny gap vertically oriented optical antenna. Radiation from antenna collimated by which facilitates collection. As numerical example, gold nanosphere placed one nanometer above center grating, our simulations predict an increase intensity up to seven orders magnitude compared...

Although optical resonators are widely used for controlling and engineering thermal radiation, what has been lacking is a general theoretical framework to elucidate the emission of resonators. We developed self-consistent formalism describe radiation from arbitrary made by lossy dispersive materials like metals, with only assumption that have single predominant resonance mode. Our derives fundamental limit spectral power an resonator proves this can be achieved when mode losses emitter...

The behavior of the Cr 3+ centers in KDP:(CrNO 3 ) crystals is illustrated by an analysis experimental and theoretical calculations.

In the near field, Planck's law of blackbody radiation breaks down, and radiative heat transfer can be enhanced by orders magnitude when surface polaritons are supported interacting materials. However, such thermal enhancement is strongly material dependent, thus difficult to control. Here, we propose a metamaterial-based structure consisting patterned doped silicon nanorods that exhibits tunable narrow-band emission. Direct numerical simulation based on Wiener chaos expansion (WCE) method...

Abstract Thermal radiation plays an increasingly important role in many emerging energy technologies, such as thermophotovoltaics, passive radiative cooling and wearable clothes [1]. One of the fundamental constraints thermal is Stefan-Boltzmann law, which limits maximum power far-field to P 0 = σT 4 S, where σ Boltzmann constant, S T are area temperature emitter, respectively (Fig. 1a). In order overcome this limit, it has been shown that near-field radiations could have density orders...

Refractive indices of partially deuterated potassium dihydrogen phosphate (DKDP) crystals with 55%, 70% and 80% deuterium contents were measured by auto-collimation method at 293 K between 0.254 to 1.529 μm. Dependence refractive DKDP on content show different trend in the infrared region as uv-visible region. n2 (the square index) mole fraction shows a difference pure KDP KDP. The Sellmeier equations obtained least method. non-critical phase matching angles calculated from fitted formula...