Selective Absorption

Some Aspects of Selective Absorption

1. A mechanism exists in Valonia which prevents certain substances (Na, Mg, Ca, SO(4)) from reaching as high a concentration inside the cell as in the sea water which surrounds it. 2. A trapping mechanism also exists which causes K to accumulate in the cell in a concentration far in excess of that found in sea water. Practically all the K in the cell exists in the form of KCl. 3. The concentrat...

Five-Photon Absorption and Selective Enhancement of Multiphoton Absorption Processes

We study one-, two-, three-, four-, and five-photon absorption of three centrosymmetric molecules using density functional theory. These calculations are the first ab initio calculations of five-photon absorption. Even- and odd-order absorption processes show different trends in the absorption cross sections. The behavior of all even- and odd-photon absorption properties shows a semiquantitativ...

Superwetting nanowire membranes for selective absorption.

The construction of nanoporous membranes is of great technological importance for various applications, including catalyst supports, filters for biomolecule purification, environmental remediation and seawater desalination. A major challenge is the scalable fabrication of membranes with the desirable combination of good thermal stability, high selectivity and excellent recyclability. Here we pr...

Selective Absorption of Starlight by Interstellar Clouds.

Angle-selective perfect absorption with two-dimensional materials

Two-dimensional (2D) materials have great potential in photonic and optoelectronic devices. However, the relatively weak light absorption in 2D materials hinders their application in practical devices. Here, we propose a general approach to achieve angleselective perfect light absorption in 2D materials. As a demonstration of the concept, we experimentally show giant light absorption by placing...