Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



A suspended metasurface achieves complete light absorption: a 50 nm-thick optical nanomicrophone

Author affiliations

Abstract

Considerably subtle vibrations can be detected by light signals. Commonly, this is achieved based on the phase change of light that can be attributed to the vibration of a movable mirror, which has been used in gravitational wave detection. For a homogeneous dielectric membrane, the thinner the membrane, the greater the membrane vibration amplitude will be with respect to the sound pressure. However, if the membrane is too thin, most of the light will transmit through the membrane and the sensitivity will be reduced. To resolve this contradiction, we have developed a metasurface membrane with a thickness of only 50 nm but a considerably high reflectivity. This membrane is integrated with a 100-nm-thick gold membrane to form a cavity that can achieve perfect absorption of light. The vibration of the metasurface, which records the sound wave information, can change the light absorption. The noise equivalent pressure of the proposed structure is several orders lower than those of the recently reported optoacoustic detectors, and the alternating current signal response can be enhanced by approximately 1500 times compared with that of a membrane without a metasurface. The integration of nanomechanical oscillators and ultrathin membranes with a metasurface may facilitate future ultrasensitive sound and ultrasonic detection and benefit optomechanic design.

Graphical abstract: A suspended metasurface achieves complete light absorption: a 50 nm-thick optical nanomicrophone

Back to tab navigation

Supplementary files

Article information


Submitted
01 Apr 2020
Accepted
13 Jun 2020
First published
15 Jun 2020

Nanoscale, 2020, Advance Article
Article type
Paper

A suspended metasurface achieves complete light absorption: a 50 nm-thick optical nanomicrophone

J. Xu, X. Jiang, C. Guo, Y. Guo, R. Yan, J. Zhang, Z. Zhu, Z. Tan and K. Liu, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR02605K

Social activity

Search articles by author

Spotlight

Advertisements