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Updated: Apr 6, 2026

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition

Published on: August 29, 2017

Creating semiconductor metafilms with designer absorption spectra.

Soo Jin Kim¹, Pengyu Fan¹, Ju-Hyung Kang¹

¹Geballe Laboratory for Advanced Materials, 476 Lomita Mall, Stanford, California 94305-4045, USA.

Nature Communications

|July 18, 2015

Summary

This summary is machine-generated.

Researchers created ultrathin semiconductor metafilms with tunable absorption spectra using optical metamaterials. These designer metafilms enable custom light absorption for advanced optoelectronic devices and solar cells.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Semiconductor optical properties are traditionally fixed.
Optical metamaterials offer new ways to control light-matter interactions.
Ultrathin films are desirable for planar device integration.

Purpose of the Study:

To engineer semiconductor metafilms with designer absorption spectra.
To demonstrate near-unity absorption in ultrathin semiconductor films.
To explore applications in planar optoelectronics and solar cells.

Main Methods:

Fabrication of dense arrays of semiconductor antennas (Ge nanobeams) with subwavelength spacing.
Utilizing optical metamaterial principles to tailor absorption.
Experimental characterization and computational simulations of optical properties.

Main Results:

Achieved near-unity absorption at target wavelengths in sub-50-nm-thick metafilms.
Demonstrated that spectral absorption is dictated by individual semiconductor antenna properties.
Showcased the potential for custom absorption spectra through antenna design.

Conclusions:

Semiconductor metafilms offer a novel platform for controlling light absorption.
This approach enables the design of custom optical properties in ultrathin semiconductor films.
Opens new avenues for advanced planar optoelectronic devices and efficient solar cells.