Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43298
Title: Integrated terahertz graphene modulator with 100% modulation depth
Authors: Liang, G
Hu, X
Yu, X
Shen, Y
Li, LH
Davies, AG
Linfield, EH
Liang, HK
Zhang, Y
Yu, SF 
Wang, QJ
Keywords: 100 percent modulation depth
Graphene
Integrated photonics
Quantum cascade laser
Terahertz modulator
Issue Date: 2015
Publisher: American Chemical Society
Source: ACS photonics, 2015, v. 2, no. 11, p. 1559-1566 How to cite?
Journal: ACS photonics 
Abstract: Terahertz (THz) frequency technology has many potential applications in nondestructive imaging, spectroscopic sensing, and high-bit-rate free-space communications, with an optical modulator being a key component. However, it has proved challenging to achieve high-speed modulation with a high modulation depth across a broad bandwidth of THz frequencies. Here, we demonstrate that a monolithically integrated graphene modulator can efficiently modulate the light intensity of the THz radiation from a THz quantum cascade laser with a 100% modulation depth for certain region of the pumping current, as a result of the strongly enhanced interaction between the laser field and the graphene enabled by this integration scheme. Moreover, the small area of the resulting device in comparison to existing THz modulators enables a faster modulation speed, greater than 100 MHz, which can be further improved through optimized designs of the laser cavity and modulator architectures. Furthermore, as the graphene absorption spectrum is broadband in nature, our integration scheme can be readily scaled to other wavelength regions, such as the mid-infrared, and applied to a broad range of other optoelectronic devices.
URI: http://hdl.handle.net/10397/43298
ISSN: 2330-4022
DOI: 10.1021/acsphotonics.5b00317
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

24
Last Week
2
Last month
Citations as of Jun 23, 2017

WEB OF SCIENCETM
Citations

22
Last Week
0
Last month
Citations as of Jun 16, 2017

Page view(s)

26
Last Week
4
Last month
Checked on Jun 18, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.