Electrically driven optical metamaterials

Abstract

The advent of metamaterials more than 15 years ago has offered extraordinary new ways of manipulating electromagnetic waves. Yet, progress in this field has been unequal across the electromagnetic spectrum, especially when it comes to finding applications for such artificial media. Optical metamaterials, in particular, are less compatible with active functionalities than their counterparts developed at lower frequencies. One crucial roadblock in the path to devices is the fact that active optical metamaterials are so far controlled by light rather than electricity, preventing them from being integrated in larger electronic systems. Here we introduce electroluminescent metamaterials based on metal nano-inclusions hybridized with colloidal quantum dots. We show that each of these miniature blocks can be individually tuned to exhibit independent optoelectronic properties (both in terms of electrical characteristics, polarization, colour and brightness), illustrate their capabilities by weaving complex light-emitting surfaces and finally discuss their potential for displays and sensors.

Tunable Broadband Wavefronts Shaping via Chaotic Speckle Image Holography Carrier Fringes

“…However, the holography metasurfaces are constrained by sophisticated design and fabrication procedures and are less compatible with dynamic functionalities as well as unequal across the electromagnetic spectrum. [16] Consequently, the creation of new optical holography metasurfaces that can be adjusted at will and integrated into optoelectronic systems would help to bridge the chasm between our macroscopic world and application based on this fascinating emerging field of microscopic systems.…”

“…[15] Therefore, these new types of holography metasurfaces have offered attractive functionalities for developing new types of optoelectronic devices. [16] Consequently, the creation of new optical holography metasurfaces that can be adjusted at will and integrated into optoelectronic systems would help to bridge the chasm between our macroscopic world and application based on this fascinating emerging field of microscopic systems.Nowadays, interest in the application of white organic lightemitting diodes (WOLEDs) for solid-state lighting and flat-panel display backlightings has been steadily increasing. [16] Consequently, the creation of new optical holography metasurfaces that can be adjusted at will and integrated into optoelectronic systems would help to bridge the chasm between our macroscopic world and application based on this fascinating emerging field of microscopic systems.…”

“…However, the holography metasurfaces are constrained by sophisticated design and fabrication procedures and are less compatible with dynamic functionalities as well as unequal across the electromagnetic spectrum. [16] Consequently, the creation of new optical holography metasurfaces that can be adjusted at will and integrated into optoelectronic systems would help to bridge the chasm between our macroscopic world and application based on this fascinating emerging field of microscopic systems.Nowadays, interest in the application of white organic lightemitting diodes (WOLEDs) for solid-state lighting and flat-panel display backlightings has been steadily increasing. [17][18][19] The maximum scientific reported power efficiency (PE) of WOLEDs has exceeded 100 lm W −1 beyond fluorescent tude efficiency for both rigid and flexible devices.…”

Electroluminescence of Colloidal Quantum Dots in Electrical Contact with Metallic Nanoparticles

“…Recently, we have introduced a type of artificial electroluminescence (EL) based on the hybridization between an array of gold nanoparticles and a carpet of colloidal quantum dots (CQDs) . What makes these structures qualitatively and quantitatively different from the LEDs discussed above is the location of the metal nanoparticles within the devices—they are in direct contact with the carpet of colloidal quantum dots, which is in contrast to past studies where the metal inclusions were always placed at some distance from the electroluminescent layer.…”

A Terahertz Quadruple-resonant Metamaterial using Single-particle Asymmetrical-ELC resonators

“…Since Pendry has introduced the conception of split-ring resonators (SRRs) [2], various descendants have been derived, including electric-field-coupled resonator [3], chevrons shaped resonator [4] and other resonators [5] [6]. With the deepening of the research, the multi-band [7], high-Q (quality) [8], broadband [9], tunable [10] metamaterials can be realized by designing different structures, which are valuable in many electromagnetic engineering applications [11] [12]. Particularly, the multi-band metamaterials are widely used, such as absorbers [13], modulators [14] and polarizers [15], hence, it's attractive to design and fabricate multi-resonant metamaterials.…”