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Active modulation of light with large optical bandwidths (∼100 nm [1]) is required in photonic devices, such as modulators for fiber communications [1] and saturable absorbers for ultrafast pulse generation [2,3]. Present modulators use expensive materials, (e.g. LiNbO3 [4], III-V semiconductors [5], and Ge on silicon-on-insulator (SOI) [6]), and are limited by narrowband operation (∼20 nm for quantum-confined...
The method of Ethanol catalytic deposition (ECD) had been proposed and demonstrated in the deposition of MoSe2 on the tapered fiber. ECD method can significantly improve the velocity and the efficiency of deposition. In our work, we used the ECD method to deposit the two-dimensional (2D) MoSe2 materials to prove that the ECD method can be applied to many similar 2D materials. Also, we compared the...
We study the absorption enhancement of graphene on silicon slot waveguides (SWs). The absorption of TE mode SW is 0.935 dB/µm at telecommunication band, higher than that of fundamental mode channel waveguides for both polarizations.
We demonstrate asymmetric conical diffraction accompanied by pseudospin-mediated non-integer phase singularities when two sublattices of photonic graphene are equally excited near the Dirac points. Experimental and numerical results agree with analysis of the Dirac equation.
Two-dimensional (2D) materials have emerged as attractive mediums for fabricating versatile optoelectronic devices. Recently, it has been discovered that several types of 2D materials possess both the saturable absorption effect and large nonlinear refractive index, such as graphene, topological insulator (TI), and Molybdenum Disulfide (MoS2). Taking advantage of the unique nonlinear optical properties...
We observe vortex generation by selective excitation of two honeycomb sublattices at the vicinity of Dirac points. Such vortices arise from graphene “pseudospin”, suggesting that “pseudospin” could be observable and possess real angular momentum.
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