Ultra Thin Flexible Octagonal Metamaterials Absorber

Nanocavity enhancement for ultra-thin film optical absorber.

A fundamental strategy is developed to enhance the light-matter interaction of ultra-thin films based on a strong interference effect in planar nanocavities, and overcome the limitation between the optical absorption and film thickness of energy harvesting/conversion materials. This principle is quite general and is applied to explore the spectrally tunable absorption enhancement of various ult...

Ultra-thin Silicon Chips in Flexible Microsystems

With the growing demand for mechanically flexible electrical systems and the increasing level of integration of electrical assemblies, hybrid build-ups combining polymer substrates and ultra-thin flexible silicon chips (system-in-foil) are getting more and more important. These systems need thin chips which maintain their functionality even in bent condition as well as reliable handling and ass...

A Planar, Layered Ultra-wideband Metamaterial Absorber for Microwave Frequencies

In this paper, an ultra-wideband metamaterial absorber is designed and simulated. The proposed absorber is planar and low profile. It is made of a copper sheet coated with two dielectric layers. Each unit cell of the metamaterial structure is composed of multiple metallic split rings, which are patterned on the top and middle boundaries of the dielectrics. The designed absorber utilizes differe...

Ultra-smooth glassy graphene thin films for flexible transparent circuits

Large-area graphene thin films are prized in flexible and transparent devices. We report on a type of glassy graphene that is in an intermediate state between glassy carbon and graphene and that has high crystallinity but curly lattice planes. A polymer-assisted approach is introduced to grow an ultra-smooth (roughness, <0.7 nm) glassy graphene thin film at the inch scale. Owing to the advantag...

Ultra-thin optical interference coatings on rough and flexible substrates