Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances. First, we introduce the unique advances on ultrathin 2D nanomaterials, followed by the description of their composition and crystal structures. The assortments of their synthetic methods are then summarized, including insights on their advantages and limitations, alongside some recommendations on suitable characterization techniques. We also discuss in detail the utilization of these ultrathin 2D nanomaterials for wide ranges of potential applications among the electronics/optoelectronics, electrocat...

Recent Advances in Ultrathin Two-Dimensional Nanomaterials

International Technology Roadmap for Semiconductors 2003の要求清浄度について － シリコンウエハ表面と雰囲気環境に要求される清浄度, 分析方法の現状について －

The isolation of a growing number of two-dimensional (2D) materials has inspired worldwide efforts to integrate distinct 2D materials into van der Waals (vdW) heterostructures. Given that any passivated, dangling-bond-free surface will interact with another through vdW forces, the vdW heterostructure concept can be extended to include the integration of 2D materials with non-2D materials that adhere primarily through non-covalent interactions. We present a succinct and critical survey of emerging mixed-dimensional (2D + nD, where n is 0, 1 or 3) heterostructure devices. By comparing and contrasting with all-2D vdW heterostructures as well as with competing conventional technologies, we highlight the challenges and opportunities for mixed-dimensional vdW heterostructures.

Mixed-dimensional van der Waals heterostructures

Metasurfaces: From microwaves to visible

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Design Of Analog Cmos Integrated Circuits

As a full wave simulation method, the finite-difference time-domain (FDTD) method is capable of capturing the transient characteristics of wave propagation. This method has been successfully used in modeling the interactions of electromagnetic waves with double negative (DNG) materials. Another method, the pesudospectral time-domain (PSTD) method, is superior to FDTD in its linear dispersion relation. Another advantage of PSTD is that all field components are now located at a same position in the unit cell. Therefore, it is more natural to handle the boundary condition on interfaces between different materials. In this paper, FDTD and PSTD are used to simulate the transient evolution of wave propagation in structures with DNG materials. Numerical results are given to provide clear descriptions of the novel wave behaviors.

FDTD and PSTD simulations for double negative (DNG) materials applications

New differential stacked spiral inductors were employed in our design of VCOs fabricated using the CMOS 0.18 mum technology in this paper. The frequency tuning range of these VCOs were extended significantly, and the measured oscillation frequencies cover from 1.69 to 2.1375 GHz, with 23.3% tuning range and phase noise about -118.41 dBc/Hz at 1 MHz theoretically. The core current of these VCOs is about 25 mA at 1.8 V supply voltage. What is more, the VCO designed only occupies on-chip area of 365 times 504 mum2, which is much smaller than that of other VCOs reported in the literature recently.

Differential VCO design with a wide frequency tuning range

The interaction of a Gaussian beam wa e with an array of slit-coupled cylindrical-impedance screens is in estigated using the direct integral-equation technique, and the induced currents on impedance screens are expanded in terms of a series of Chebyshe polynomials of the first kind. Furthermore, the far-zone scattered-field solutions to such a multiple-coupling array are obtained in an analytical form. Then, numerical results are presented to show the far-zone scattered-field distributions of some finite arrays. 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 248 252, 2000.

https://www.researchgate.net/profile/Joshua_Li/publication/243136884_The_interaction_of_a_Gaussian_beam_wave_with_an_array_of_slit-coupled_cylindrical-impedance_screens/links/00463536913db17d08000000.pdf

The interaction of a Gaussian beam wave with an array of slit‐coupled cylindrical‐impedance screens

The electromagnetic scattering by an array of finite cylindrically curved thin screens is investigated in this paper, and the normally incident plane wave can be either TMz- or TEz-polarised. The mathematical treatment here is based on the direct integral equation technique combined with the Galerkin's procedure, and the induced currents on the curved thin screens or apertures are expanded in terms of a series of Chebyshev polynomials of the first kind. Furthermore, the far-zone field solutions to such a multiple coupling system are obtained in an analytical form, and parametric calculations are performed to show the variation of the scattered far-zone field distributions at both TMz- and TEz-polarisation incidences.

Multiple scattering by an array of finite cylindrically curved thin screens

An accurate marching-on-in-degree (MOD) scheme is proposed to solve the time-domain integral equation (TDIE) integrated with the modified nodal analysis (MNA) for simulating transient field-circuit coupling problems. In the MOD scheme, a set of weighted Laguerre polynomials is chosen as the temporal basis functions. Besides, the current continuity equation is modified for connecting the electromagnetic structures and circuit parts. Some numerical results are presented to demonstrate the accuracy of our MOD-based method.

Wen-Yan Yin

Papers

FDTD and PSTD simulations for double negative (DNG) materials applications

Differential VCO design with a wide frequency tuning range

The interaction of a Gaussian beam wave with an array of slit‐coupled cylindrical‐impedance screens

Multiple scattering by an array of finite cylindrically curved thin screens

MOD based TDIE-MNA method for solving hybrid field-circuit problems