# Optical cages made of graphitic frameworks

## TL;DR

This paper explores graphitic cage structures for infrared absorption, demonstrating their potential for applications like EM shielding and energy harvesting through simulations and analysis of their optical properties.

## Contribution

It introduces a novel design of graphitic cages with flat IR absorption spectra and analyzes their electromagnetic behavior across different frequencies.

## Key findings

- Achieves flat absorption spectrum with A~0.83 between 10-30 microns
- Multiple absorption lines observed at microwave frequencies
- Energy funneling in cage-within-cage structures leads to hotter inner cages

## Abstract

In pursuit of infrared (IR) radiation absorbers, we examine quasicrystal structures made of graphite wires. An array of graphitic cages and cage-within-cage, and whose overall dimensions is smaller than the radiation wavelength exhibit a flat absorption spectrum, A~0.83 between 10-30 microns and a quality loss factor of L~0.83 (L=A/Q, with Q, the quality factor). Simulations at microwave frequencies show multiple absorption lines. In the case of a cage within cage, energy is funneled towards the inner cage which result in a rather hot structure. Applications are envisioned as anti-fogging surfaces, EM shields and energy harvesting.

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Source: https://tomesphere.com/paper/1907.08656