The recent progress on radiative cooling reveals its potential for applications in highly efficient passive cooling. This approach utilizes the maximized emission of infrared thermal radiation through atmospheric window releasing heat and minimized absorption incoming radiation. These simultaneous processes can lead to a device temperature substantially below ambient temperature. Although application nighttime was demonstrated few decades ago, significant under direct sunlight has been...

A metamaterial thermal emitter for highly efficient radiative cooling is demonstrated. The selectively radiates within the atmospheric transparency window and minimizes absorption of radiation outside window. Exploiting its intriguing properties, has ability to deliver a remarkably high power more than 100 W m−2 cool down 12 °C below ambient temperature. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be...

Abstract Tailoring emissivity and absorptivity of structured material surfaces to match atmospheric transmission spectral windows can lead radiative cooling that consumes no external energy. Recent advances in nanofabrication technology have facilitated progress the realization metasurfaces. In particular, subwavelength dielectric resonator metasurface supporting various resonance modes be efficient absorbers. Here, such metasurfaces are proposed experimentally demonstrated enhanced by metal...

Finding new ways to control and slow down the group velocity of light in media remains a major challenge field optics. For design plasmonic structures, graphene represents an attractive alternative metals due its strong confinement, comparably low ohmic loss versatile tunability. Here we propose novel nanostructure consisting monolayer on silicon based graded grating structure. An external gate voltage is applied silicon, which are separated by spacer layer silica. Theoretical numerical...

Graphene has been identified as an emerging horizon for a nanoscale photonic platform because the Fermi level of intrinsic graphene can be engineered to support surface plasmons (SPs). The current solid back electrical gating and chemical doping methods cannot facilitate demonstration SPs at near-infrared (NIR) window limited shift level. Here, we present evidence existence on tapered graphene-silicon waveguide tip NIR wavelength, employing carrier transfer method with molybdenum trioxides....

Abstract Periodic metallic nano/microstructures have received a great deal of attention in the photonics research community over last few decades due to their intriguing optical properties. Three‐dimensional such as photonic crystals, metamaterials, and plasmonic devices possess unique characteristics tailored thermal radiation, negative refraction deep subwavelength confinement light. In this article, recent progress on experimental methods for realisation three‐dimensional periodic thin...

Plasmon hybridization theory (PHT) is an analytical model developed for understanding plasmonic interactions within complex metallic nanostructures, and gives a useful insight optimizing design parameters. However, this based on the electrostatic limit, which restricts to nanostructures much smaller than free space wavelength of light. Here, we extend PHT incorporate retardation Coulomb interaction investigate effects plasmons structures. We compare these results using other methods, such as...

-This paper presents the design of a sinusoidal, triangular, and square wave generator using high speed current feedback operational amplifier (CFOA). A macro model for CFOA is developed as well. The frequency oscillation in all cases are derived compared with simulated values. achieved sinusoidal 9.4 MHz to 15 triangular/rectangular 6.75 59.5 MHz. advantage get higher wave.

Localized plasmon resonances are proposed in a new concept of 3D photonic crystals stacked by hybrid rods made dielectric-cores and metallic-nanoshells. The resonant coupling inner outer surfaces the metallic-nanoshells forms localized which can be flexibly tuned mediating dielectric cores. At resonance wavelengths, strong electromagnetic wave-plasmon interaction leads to enhancement structural absorption more than 20 times. tunability enhanced is demonstrated experiments.

Dielectric nonlinear waveguides have reached their maximum potential in achieving high nonlinearity due to the limitation of mode confinement beyond diffraction limit. We theoretically demonstrate that a plasmonic waveguide consisted subwavelength core coated by metallic nanoshell can achieve ultrahigh and complete confinement. Our results show possess an Kerr up 4.1 × 10(4) W(-1) m(-1) with nearly 100% energy residing inside at λ = 1.55 µm. The optical properties are explored detailed...

We present a detailed theoretical analysis which reveals useful insight to understand the resonant dissipative behavior of 3D woodpile metallic photonic crystals in spectral response. observe that small amount structural parameter modifications can induce great flexibility alter properties absorption resonance with even an extremely narrow band width ~13 nm. Analyzing dispersive and performing thorough numerical simulations for finite number layers we found magnitude, width, tunability...

Anisotropic metamaterial emitters can serve a key role in highly efficient radiative cooling. Described by M. Gu and co-workers on page 1047, they are designed to selectively radiate within the atmospheric transparency window minimize absorption of radiation outside window. Using these unique properties, device realized with artificial has ability cool down 12 °C below ambient temperature.

Excellent light-directing abilities are demonstrated by well-designed three-dimensional micrometer-sized parabolic mirrors that fabricated direct laser writing and subsequent surface coating of titanium silver. The full-width at half-maximum the measured light divergence for with different geometries is much less than 20 μm, even when height up to 130 μm. These results beneficial developing highly collimating light-emitting diodes. simulation reveals electric field intensity distribution...

Here we demonstrate enhanced optical absorptions within three-dimensional inversed woodpile metallic photonic crystals fabricated via the combination of direct laser writing method and electrodeposition method. These microstructures operating in wavelengths are found to possess multiple absorption peaks over a broad spectral range. We characterize properties with detailed numerical simulations show that broadband originate from excitation robust localized plasmon resonances interactions at...

Thermal effects on current mirror performance are significant. It is especially important to consider the thermal for mirrors designed with dielectrically isolated bipolar devices. in integrated circuits can be categorized as coupling, self-heating and package effect. This paper describes effect of output characteristics mirrors. In general all frequently used analog IC design simulated measured vertical inter-company (VBIC) a step by procedure it shown that this reduced or made negligible...

In this paper, we show the experimental demonstration of plasmon propagation in cylindrical metallic nanoshells which is coated, via electroless silver deposition method, on dielectric nanorods fabricated by using direct laser writing method. The measurement and numerical analysis reveal polarization sensitivity modes within nanoshells. We further characterize fundamental properties these exploiting their dispersive features explain mechanism for excitation identifying radiative nonradiative nature.

A quasi rail-to-rail (VDD -Vdsa, -Vss) operational amplifier with a single differential pair is presented. new common-mode adapter circuit based on structure proposed. With the circuit, input range extended; differential-mode signal not affected. two-stage proposed designed TSMC 0.18 mum CMOS technology. 1 V supply voltage and 15 pF capacitance load, simulation shows DC gain about 82 dB, unity-gain frequency 6 MHz, phase margin 60deg.

This paper presents the design of a V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">BE</sub> based bootstrap (self-bias) current source and self-heating effects on its performance. The performance this reference circuit is measured by sensitivity output with respect to power supply voltage. effect base emitter voltage resistance device used clarify requirements. Based upon basic principle referenced source, several combinations sources mirrors...

A metallic-nanoshelled rectangular dielectric rod is proposed to flexibly enhance and tune the structural absorption. Due ultra-small thickness of metallic-nanoshells, electromagnetic (EM) waves can penetrate into rods cavity resonances be formed. At resonances, strong EM wave–matter interaction results in an enhancement absorption by more than one order magnitude. By stacking nanoshelled rods, a three-dimensional (3D) woodpile photonic crystal with both resonance band gap effect realized....

Three-dimensional micrometer-sized parabolic mirror arrays are designed. High-quality fabricated by the direct laser writing technique. These beneficial to development of light-directing light emitting diodes and ultra-high efficiency solar cells.

This paper presents thermal characterization of the dielectrically isolated bipolar junction transistor (DIBJT) with vertical inter-company (VBIC) model. The VBIC model incorporates nodes a transistor. Semiconductor devices are strongly influenced by effects. When device is heated, it raises its local temperature which changes device's intrinsic parameters. shows behavior collector current, base transconductances, and versus temperature. It also several other characteristics DIBJT device.