Publications (27)
High-Fidelity Transfer of 2D Bismuth Oxyselenide and its Mechanical Properties
Wenjun Chen, Usman Khan, Simin Feng +3
Two-dimensional (2D) bismuth oxyselenide (Bi2O2Se) with high electron mobility is advantageous in future high-performance and flexible electronic and optoelectronic devices. Howeve…
Guided Modes of Elliptical Metamaterial Waveguides
Klaus Halterman, Simin Feng, P. L Overfelt
The propagation of guided electromagnetic waves in open elliptical metamaterial waveguide structures is investigated. The waveguide contains a negative-index media core, where the…
Exotic Grazing Resonances in Nanowires
Simin Feng, Klaus Halterman
We investigate electromagnetic scattering from nanoscale wires and reveal for the first time, the emergence of a family of exotic resonances, or enhanced fields, for source waves c…
Parametrically Shielding Electromagnetic Fields by Nonlinear Metamaterials
Simin Feng, Klaus Halterman
An analytical theory is developed for parametric interactions in metamaterial multilayer structures with simultaneous nonlinear electronic and magnetic responses and with near-zero…
Omnidirectionally Bending to the Normal in epsilon-near-Zero Metamaterials
Simin Feng
Contrary to conventional wisdom that light bends away from the normal at the interface when it passes from high to low refractive index media, here we demonstrate an exotic phenome…
Perfect Absorption in Ultrathin Epsilon-Near-Zero Metamaterials Induced by Fast-Wave Non-Radiative Modes
Simin Feng, Klaus Halterman
Above-light-line surface plasmon polaritons can arise at the interface between a metal and epsilon-near-zero metamaterial. This unique feature induces unusual fast-wave non-radiati…
High Yield Growth and Doping of Black Phosphorus with Tunable Electronic Properties
Mingqiang Liu, Simin Feng, Yi Hou +5
Black phosphorus (BP) has recently attracted significant interest due to its unique electronic and optical properties. Doping is an effective strategy to tune a material's electron…
Graphical retrieval method for orthorhombic anisotropic materials
Simin Feng
We apply the equivalent theory to orthorhombic anisotropic materials and provide a general unit-cell design criterion for achieving a length-independent retrieval of the effective…
Dissolution-Precipitation Growth of Uniform and Clean Two Dimensional Transition Metal Dichalcogenides
Zhengyang Cai, Yongjue Lai, Shilong Zhao +8
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted much interest and shown promise in many applications. However, it is challenging to obtain uniform TMDC…
Loss enhanced transmission and collimation in anisotropic epsilon-near-zero metamaterials
Lei Sun, Simin Feng, Xiaodong Yang
We verify the extraordinary transmission enhancement and collimation induced by the material loss in anisotropic near-zero permittivity (ENZ) metamaterials, and reveal the physical…
Dissipation-Induced Super Scattering and Lasing PT-Spaser
Simin Feng
Giant transmission and reflection of a finite bandwidth are shown to occur at the same wavelength when the electromagnetic wave is incident on a periodic array of PT-symmetric dime…
Metal to insulator quantum-phase transition in few-layered ReS
Nihar R. Pradhan, Amber McCreary, Daniel Rhodes +11
In ReS a layer-independent direct band-gap of 1.5 eV implies a potential for its use in optoelectronic applications. ReS crystallizes in the 1T-structure which l…
Doping Concentration Modulation in Vanadium Doped Monolayer Molybdenum Disulfide for Synaptic Transistors
Jingyun Zou, Zhengyang Cai, Yongjue Lai +7
Doping is an effective way to modify the electronic property of two-dimensional (2D) materials and endow them with new functionalities. However, wide-range control of the substitut…
Resonant Transmission of Electromagnetic Fields through Subwavelength Zero- Slits
Klaus Halterman, Simin Feng
We theoretically investigate the transmission of electromagnetic radiation through a metal plate with a zero- metamaterial slit, where the permittivity tends towards zero over…
Phase Modulators Based on High Mobility Ambipolar ReSe2 Field-Effect Transistors
Nihar R. Pradhan, Carlos Garcia, Bridget Isenberg +11
We fabricated ambipolar field-effect transistors (FETs) from multi-layered triclinic ReSe2, mechanically exfoliated onto a SiO2 layer grown on p-doped Si. In contrast to previous r…
Gate-modulated conductance of few-layer WSe_2 field-effect transistors in the subgap regime: Schottky barrier transistor and subgap impurity states
Junjie Wang, Daniel Rhodes, Simin Feng +7
Two key subjects stand out in the pursuit of semiconductor research: material quality and contact technology. The fledging field of atomically thin transition metal dichalcogenides…
Exotic leaky wave radiation from anisotropic epsilon near zero metamaterials
Klaus Halterman, Simin Feng, Viet Cuong Nguyen
We investigate the emission of electromagnetic waves from biaxial subwavelength metamaterials. For tunable anisotropic structures that exhibit a vanishing dielectric response along…
Equivalent Theory and Retrieval of Effective Metamaterials Parameters
Simin Feng
We apply the equivalent theory to orthorhombic anisotropic materials and provide a general unit-cell design criterion for achieving a length-independent retrieval of the effective…
Mode Bifurcation and Fold Points of Complex Dispersion Curves for the Metamaterial Goubau Line
P. L. Overfelt, Klaus Halterman, Simin Feng +1
In this paper the complex dispersion curves of the four lowest-order transverse magnetic modes of a dielectric Goubau line () are compared with those of a dispersive me…
Catalyst-Free Growth of Atomically-thin Bi2O2Se Nanoribbons for High-performance Electronics and Optoelectronics
Usman Khan, Lei Tang, Baofu Ding +6
One-dimensional (1D) materials have attracted significant research interest due to their unique quantum confinement effects and edge-related properties. Atomically thin 1D nanoribb…
Field-Effect Transistors Based on Few-Layered alpha-MoTe_2
Nihar R. Pradhan, Daniel Rhodes, Simin Feng +6
Here we report the properties of field-effect transistors based on few layers of chemical vapor transport grown alpha- MoTe_2 crystals mechanically exfoliated onto SiO_2. We perfor…
Subwavelength fractional Talbot effect in layered heterostructures of composite metamaterials
Simin Feng, Klaus Halterman, Pamela L. Overfelt
We demonstrate that under certain conditions, fractional Talbot revivals can occur in heterostructures of composite metamaterials, such as multilayer positive and negative index me…
Transparent photonic band in metallodielectric nanostructures
Simin Feng, J. Merle Elson, Pamela L. Overfelt
Under certain conditions, a transparent photonic band can be designed into a one-dimensional metallodielectric nanofilm structure. Unlike conventional pass bands in photonic crysta…
Zone-center phonons of bulk, few-layer, and monolayer 1T-TaS: Detection of the commensurate charge density wave phase through Raman scattering
Oliver R. Albertini, Rui Zhao, Rebecca L. McCann +5
We present first-principles calculations of the vibrational properties of the transition metal dichalcogenide 1T-TaS for various thicknesses in the high-temperature (undistorte…
Synthesis of ultrahigh-quality monolayer molybdenum disulfide through in-situ defect healing with thiol molecules
Simin Feng, Junyang Tan, Shilong Zhao +7
Monolayer transition metal dichalcogenides (TMDCs) are two-dimensional (2D) materials with many potential applications. Chemical vapour deposition (CVD) is a promising method to sy…
Vertical CVD Growth of Highly Uniform Transition Metal Dichalcogenides
Lei Tang, Tao Li, Yuting Luo +5
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted great attention due to their physical and chemical properties that make them promising in electronics a…
Directional perfect absorption using deep subwavelength low permittivity films
Ting S. Luk, Salvatore Campione, Iltai Kim +8
We experimentally demonstrate single beam directional perfect absorption (to within experimental accuracy) of p-polarized light in the near-infrared using unpatterned, deep subwave…