Now showing items 1-10 of 54
Broadband terahertz modulators using self-gated graphene capacitors
(Optical Society of America, 2015)
We demonstrate a terahertz intensity modulator using a graphene supercapacitor which consists of two large-area graphene electrodes and an electrolyte medium. The mutual electrolyte gating between the graphene electrodes ...
The Influence of the Rashba spin orbit coupling on the two dimensional magnetoexcitons
(IOP Publishing, 2011)
The influence of the Rashba spin-orbit coupling (RSOC) on the two-dimensional (2D) electrons and holes in a strong perpendicular magnetic field leads to different results for the Landau quantization in different spin ...
Graphene mode-locked femtosecond Cr: LiSAF laser
(Optical Society of America (OSA), 2015)
We report the first demonstration of femtosecond pulse generation from a Cr:LiSAF laser mode-locked with a monolayer graphene saturable absorber. Nearly transform-limited 72-fs pulses were generated at 850 nm with only two ...
Dynamic tuning of plasmon resonance in the visible using graphene
(The Optical Society, 2016)
We report active electrical tuning of plasmon resonance of silver nanoprisms (Ag NPs) in the visible spectrum. Ag NPs are placed in close proximity to graphene which leads to additional tunable loss for the plasmon resonance. ...
Electrically controlled terahertz spatial light modulators with graphene arrays
Gate-tunable high-mobility electrons on atomically thin graphene layers provide a unique opportunity to control electromagnetic waves in a very broad spectrum. In this paper, we describe an electrically-controlled multipixel ...
Broadband THz modulators based on multilayer graphene on PVC
In this study we present the direct terahertz time-domain spectroscopic measurement of CVD-grown multilayer graphene (MLG) on PVC substrate with an electrically tunable Fermi level. In a configuration consisting MLG and ...
Graphene supercapacitor as a voltage controlled saturable absorber for femtosecond pulse generation
For the first time to our knowledge, we employed a graphene supercapacitor as a voltage controlled saturable absorber at bias voltages of 0.5-1V to generate 84-fs pulses from a solid-state laser near 1255 nm.
Graphene-gold supercapacitor as a voltage-controlled saturable absorber for femtosecond pulse generation
We report, for the first time to our knowledge, a voltage-controlled graphene-gold supercapacitor saturable absorber, as a modulator with adjustable insertion loss for low-gain mode-locked lasers. Nearly transform-limited, ...
Weighing graphene with QCM to monitor interfacial mass changes
(American Institute of Physics Inc., 2016)
In this Letter, we experimentally determined the mass density of graphene using quartz crystal microbalance (QCM) as a mechanical resonator. We developed a transfer printing technique to integrate large area single-layer ...
Graphene-based optical modulators
(World Scientific Publishing Co. Pte. Ltd., 2017)
In this chapter, we summarize the recent progress on graphene based optical modulators. Ability to control density of high mobility electrons on large area graphene surface enables realization of new type of electrooptical ...