Here we realize a broadband absorber by using a hyperbolic metamaterial composed of alternating aluminum-alumina thin films based on superposition of multiple slow-wave modes. Our super absorber ensures broadband and polarization-insensitive light absorption over almost the entire solar spectrum, near-infrared and short-wavelength infrared regime (500–2500 nm) with a simulated absorption of ove...

Terahertz (THz) metamaterials have attracted great attention due to their widely application potential in smart THz devices; however, most of them are fabricated on rigid substrate and thus limit the exploration flexible electronics. In this paper, a metamaterial absorber (MMA) incorporated with phase change material vanadium dioxide (VO2) is proposed. The simulation results indicate that two a...

This paper is concerned with a new feedback control design methodology for vibration control of flexible structures by the wave control. In the wave control, controllers are usually designed to minimize the reflection coefficient based on the wave analysis. However, because the method utilizes the wave analysis directly, it has been mainly applied to simple uniform structures, and control desig...

Sensing infrared radiation is done inexpensively with pyroelectric detectors that generate a temporary voltage when they are heated by the incident infrared radiation. Unfortunately the performance of these detectors deteriorates for longer wavelengths, leaving the detection of, for instance, millimetre-wave radiation to expensive approaches. We propose here a simple and effective method to enh...

It has been reported worldwide that muddy seafloors can extract a significant fraction of the energy stored in overpassing ocean waves within several wavelengths. We consider a synthetic-seabed-carpet, supported by multiple springs and generators, that should extract wave energy the same way as muddy seafloor does. This paper presents the analytical model, the construction of the first working ...

In this paper, we proposed a high-performance electromagnetic-wave metamaterial absorber which can be used directly for 5G technology. The exhibits high performance in tailored frequency range of 28 ± 1 GHz. At both transverse-electric and transverse-magnetic polarization, the absorption exceeds 99% when electromagnetic wave is incident normally, keeps being over 97% as angle increases even to ...

We demonstrate an optically tunable graphene saturable absorber to manipulate the laser operation in pulsed fiber laser system. Owing to the strongly enhanced evanescent field interaction with monolayer graphene, we could realize an efficient control of modulation depth in the graphene saturable absorber by optical means through cross absorption modulation method. By integrating the tunable gra...

In this paper, we propose an angle- and polarization-insensitive metamaterial absorber. We design a metamaterial unit cell that is based on a split ring cross resonator (SRCR). We observe that the absorption frequency and absorption ratio are insensitive to incident angles when a via array surrounds the SRR. We demonstrate the effect of the via array using full-wave simulations by comparing the...

Different from previous works which have focused on broadening the bandwidth, we propose an electromagnetic absorber with a medium and tailored bandwidth absorption, avoids unnecessary absorption caused by too-wide bandwidth. Nevertheless, is extremely high to be more than 99% 97% for normal even oblique (45°) incidence, respectively, in frequency range of 5.8 ± 0.25 GHz both TE TM polarization...