After advent of graphene as a saturable absorber many experiments have been conducted to produce short pulse duration pulses. Here, we have measured the properties of flake-graphene saturable absorber mirrors of various flake sizes dependent on fabrication technique. These mirrors enabled us to obtain a large mode-locking bandwidth of 16nm in an erbium-doped fiber laser. Mirrors with large flak...

O R IG IN A L P A P ER Abstract Nonlinear properties of a multi-layer stack of graphene sheets are studied. It is predicted that such a structure may support dissipative plasmon-solitons generated and supported by an external laser radiation. Novel nonlinear equations describing spatial dynamics of the nonlinear plasmons driven by a plane wave in the Otto configuration are derived and the exist...

We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94 μm, using a graphene-polymer based saturable absorber. The laser outputs 3.6 ps pulses, with ~0.4 nJ energy and an amplitude fluctuation ~0.5%, at 6.46 MHz. This is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required, such as sensin...

Fractal metallic dendrites have been drawing more attentions recently, yet they have rarely been explored in electronic printing or packaging applications because of the great challenges in large-scale synthesis and limited understanding in such applications. Here we demonstrate a controllable synthesis of fractal Ag micro-dendrites at the hundred-gram scale. When used as the fillers for isotro...

The development of thin-film photovoltaics has emerged as a promising solution to the global energy crisis within field solar cell technology. However, transitioning from laboratory scale large-area cells requires precise and high-quality scribes achieve required voltage reduce ohmic losses. Laser scribing shown great potential in preserving efficiency by minimizing drop geometrical fill factor...

Limited internal phonon coupling and transfer within graphene in the out-of-plane direction significantly affects graphene-substrate interfacial phonon coupling and scattering, and leads to unique interfacial thermal transport phenomena. Through the simultaneous characterization of graphene and SiC Raman peaks, it is possible, for the first time, to distinguish the temperature of a graphene lay...

The ultrafast saturable absorption in graphene is experimentally and theoretically investigated in the femtosecond (fs) time regime. This phenomenon is well-modeled with valence band depletion, conduction band filling and ultrafast intraband carrier thermalization. The latter is dominated by intraband carrier-carrier scattering with a scattering time of 8 ( +/- 3) fs, which is far beyond the ti...

Given the outstanding progress in research over past decade, perovskite photovoltaics (PV) is about to step up from laboratory prototypes commercial products. For this happen, realizing scalable processes allow technology transition solar cells modules pivotal. This work presents all-evaporated PV with all thin films coated by established vacuum deposition processes. A common 532-nm nanosecond ...

Surface plasmon polaritons (hereafter plasmons) are essentially light waves trapped to the surface of a conductor due to their interaction with conduction electrons. The strong spatial confinement of the electromagnetic field and its coupling to charge carriers allow for the manipulation of light at subwavelength scales (beyond the diffraction limit of classical optics), opening the possibility...