CONFERENCE PROCEEDINGS
Advanced Search
Home > Proceedings > Volume 10826 > Article
Paper
9 November 2018 Optically controlled graphene based terahertz modulator
Zijie Dai, Jing Yang, Qiang Su, Pengfei Qi, Dan Lu, Shuai Li, Langfeng Zhou, Weiwei Liu
Author Affiliations +
Proceedings Volume 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V; 108261J (2018) https://doi.org/10.1117/12.2502204
Event: SPIE/COS Photonics Asia, 2018, Beijing, China
Abstract
A spectrally wide-band terahertz modulator based on monolayer graphene on germanium (GOG) is proposed. Utilizing a homemade THz-TDS (Terahertz-time domain spectroscopy) system, we experimentally demonstrated that the THz modulator can be tuned by a 1550 nm pump beam in a frequency range from 0.2 to 1.5 THz. The average transmittance of THz decreases from 40% to 22% when the pump power is increased to 250 mW, while the absorption coefficient averaged increases from 19 cm-1 to 44 cm-1. The maximum modulation depth of the GOG modulator can reach as high as 62% at 0.38 THz and in a frequency range from 0.2 to 0.7 THz, the modulation depth is over 50%. Compared with bare Ge, it was proved that the modulation performance can be moderately enhanced by introducing monolayer graphene. This novel optically controlled graphene based THz modulator provides a feasible method for terahertz applications in communication and imaging.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Zijie Dai, Jing Yang, Qiang Su, Pengfei Qi, Dan Lu, Shuai Li, Langfeng Zhou, and Weiwei Liu "Optically controlled graphene based terahertz modulator", Proc. SPIE 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V, 108261J (9 November 2018); https://doi.org/10.1117/12.2502204
ACCESS THE FULL ARTICLE
ORGANIZATIONAL
Sign in with credentials provided by your organization.
INSTITUTIONAL
Select your institution to access the SPIE Digital Library.
SELECT YOUR INSTITUTION
PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
PERSONAL SIGN IN
No SPIE Account? Create one
PURCHASE THIS CONTENT
SUBSCRIBE TO DIGITAL LIBRARY
50 downloads per 1-year subscription
Members: $195
Non-members: $335 ADD TO CART
25 downloads per 1 - year subscription
Members: $145
Non-members: $250 ADD TO CART
PURCHASE SINGLE ARTICLE
Includes PDF, HTML & Video, when available
Members: $17.00
Non-members: $21.00 ADD TO CART
PROCEEDINGS
 6 PAGES
DOWNLOAD PAPER SAVE TO MY LIBRARY
GET CITATION
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Terahertz radiation
Modulators
Graphene
Germanium
Terahertz spectroscopy
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top