A functionality switchable meta-device: from perfect reflection to perfect absorption

Abstract

Tunable meta-devices trigger immense interest in many applications like biosensing, thermal camouflage, radiative cooling, thermal emitting, infrared imaging, and energy harvesting. This paper presents a polarization-independent broadband tunable absorbing and reflecting meta-device using a phase change material Germanium-Antimony-Tellurium (GST). The proposed design manifests high absorptivity >80% over a broadband range of wavelength spanning the mid-IR regime. Furthermore, by changing the phase of GST material from crystalline to amorphous with the help of external stimuli, the absorbance of the device was reduced to almost zero in the range from 4 µm to 12 µm. To previse the angular constancy of the meta-absorber, the absorptivity was scrutinized under different incidence angles in both transverse magnetic (TM) and transverse electric (TE) polarizations which manifested the robustness of the proposed meta-absorber. As a result, the proposed absorber has tunable broadband absorbance and angular stability, which proclaim great potential in applications such as thermal camouflage, radiation detection, thermal emitter, and stealth technology, etc.

MetaVision: enabling independent wavefront control for diverse/oblique illumination angles

“…In contrast to conventional optics, metadevices utilize the abrupt phase transitions that occur at the surfaces of the devices themselves, rather than depending on light propagating phases within the systems. This distinguishing feature enables these meta-devices to appear in an ultrathin and astonishingly flat form factor, perfectly coinciding with the desired features in integrated-optics applications [19][20][21][22][23][24][25]. In the last decade, metasurfaces-based holography has achieved substantial progress.…”

Design and development of a portable compound microscope for interactive bioscience learning

“…Compact optical systems that leverage metasurface technology to reduce size are becoming more and more desirable for a variety of biological applications that require both sensing and imaging capabilities [31][32][33][34], a new technology that shows great promise for improving 3D modeling for use in biological applications [35][36][37]. Metasurfaces provide precise control over the phase, amplitude, polarization, and propagation direction of light, enabling manipulation of light at subwavelength scales [38][39][40][41]. Thus, in a variety of settings and fields, including biochemistry and anatomy, elementary schools and universities, 3D modeling and printing have been applied to the teaching of biology.…”

Tunable Broadband Terahertz Metamaterial Absorber Based on Vanadium Dioxide and Graphene

“…The terahertz (THz) wave, whose frequency ranges from 0.1 to 10 THz, has broad application prospects in medical imaging, stealth technology, security inspection, broadband communication, and so on [ 1 , 2 , 3 , 4 ]. High-performance devices are essential for effective terahertz wave manipulation in order to achieve these favorable applications.…”