Bidirectional tunable nano-film absorber based on Fabry–Pérot resonance incorporating polymer-dispersed liquid crystal

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

“…[294][295][296][297][298][299][300][301][302][303][304][305] Finally, we also briefly summarize the current emerging construction methods for low-cost broadband absorption, such as the all-dielectric design method, [318][319][320][321][322][323][324][325][326][327][328][329][330] and unpatterned method. [331][332][333][334][335][336][337] A comprehensive summary of the design strategies of BMAs is necessary for readers to intuitively understand how to construct BMAs and provide helpful guidance for the sustainable prosperity and in-depth research of BMAs.…”

“…In addition to the known use of self-assembly techniques to avoid the use of lithography for low-cost device fabrication, the researchers have experimentally demonstrated that the use of unpatterned (or pattern-free) designs is as well as an effective way to achieve broadband absorption responses without the need for lithography to build patterned resonators, and is one of the potential ways to design BMAs. [331][332][333][334][335][336][337] The major features of these unpatterned, completely planarized BMAs are that the metal layer and dielectric layer are alternately stacked without any patterned layers, which could lead to the development of "bidirectional absorbers" without masks and low precision requirements. [331,332] Based on this, Wang et al proposed and analyzed a bidirectional MA with broadband and narrowband absorption.…”

“…[331][332][333][334][335][336][337] The major features of these unpatterned, completely planarized BMAs are that the metal layer and dielectric layer are alternately stacked without any patterned layers, which could lead to the development of "bidirectional absorbers" without masks and low precision requirements. [331,332] Based on this, Wang et al proposed and analyzed a bidirectional MA with broadband and narrowband absorption. [331] Its 3D structure sketch is given in Figure 12g, and the absorption spectrum in Figure 12h shows that 99.90% absorption is achieved at 771 nm when light is incident to the system along the +z direction, while the device has more than 90% stable absorption in the bandwidth from 500 to 1450 nm when light is incident along the -z direction.…”

Aerosol jet printing polymer dispersed liquid crystals on highly curved optical surfaces and edges

“…Polymer Dispersed Liquid Crystal (PDLC) is a composite material that has electrically variable light scattering properties. Its applications are varied and include smart windows 16 , variable gratings 15 , 17 , gas sensing 18 and light modulation 19 – 21 . Although PDLC devices can be produced with flexible substrates 22 – 25 , the traditional production methods and device structure restrict their geometries which limits their applications.…”

Aerosol jet printing polymer dispersed liquid crystals on highly curved optical surfaces and edges

“…Polymer Dispersed Liquid Crystal (PDLC) is a composite material that has electrically variable light scattering properties. Its applications are varied and include smart windows 15 , variable gratings 16 , and light modulation [17][18][19] . Although PDLC devices can be produced with exible substrates [20][21][22][23] , the traditional production methods and device structure restrict their geometries which limits their applications.…”