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Ultra-broadband light trapping using nanotextured decoupled graphene multilayers.

José V Anguita¹, Muhammad Ahmad¹, Sajad Haq²

¹Advanced Technology Institute, University of Surrey, Guildford GU2 7XH, UK.

Science Advances

|March 3, 2016

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Researchers developed an ultrathin blackbody absorber using graphene and nanotextured metal particles. This 15 nm device achieves 99% absorption from infrared to ultraviolet, enabling new nanoscale optical devices.

Area of Science:

Nanophotonics
Materials Science
Optoelectronics

Background:

Broadband light trapping is crucial for energy, optoelectronics, and spectroscopy.
Achieving broadband light trapping in nanometer-scale absorbers is challenging.
Previous methods using carbon nanotubes required millimeter-tall structures.

Purpose of the Study:

To develop an ultrathin, broadband light absorber using graphene.
To overcome limitations of existing light-trapping technologies at the nanoscale.
To demonstrate a novel fabrication method for nanoscale optical devices.

Main Methods:

Utilizing few-layer decoupled graphene for optical field trapping.
Employing disordered nanotexturing of metal particles for field localization.

Keywords:

Broadband light absorption Optical nanomaterials blackbody absorber decoupled multilayer graphene graphene high emissivity of infrared radiation light management nano-optoelectronics nanoscale nanomaterials subwavelength optical absorption

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Developing a low-temperature, noncontact fabrication process compatible with delicate devices.

Main Results:

Created a 15 nm thin blackbody absorber with 99% absorption.
Achieved ultra-broadband absorption from mid-infrared to ultraviolet.
Demonstrated successful application on opto-microelectromechanical infrared emitters.

Conclusions:

The novel approach enables ultra-broadband light absorption in an ultrathin material.
The fabrication method is scalable, low-temperature, and compatible with sensitive devices.
This work offers new possibilities for nanoscale light management in optical devices.