scholarly journals Tunable unidirectional nonlinear emission from transition-metal-dichalcogenide metasurfaces

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Mudassar Nauman ◽  
Jingshi Yan ◽  
Domenico de Ceglia ◽  
Mohsen Rahmani ◽  
Khosro Zangeneh Kamali ◽  
...  
Keyword(s):  
Refractive Index ◽  
Transition Metal ◽  
Second Harmonic ◽  
Nonlinear Crystal ◽  
High Refractive Index ◽  
Great Promise ◽  
Fundamental Wave ◽  
Light Sources ◽  
Transition Metal Dichalcogenide ◽  
Single Beam

AbstractNonlinear light sources are central to a myriad of applications, driving a quest for their miniaturisation down to the nanoscale. In this quest, nonlinear metasurfaces hold a great promise, as they enhance nonlinear effects through their resonant photonic environment and high refractive index, such as in high-index dielectric metasurfaces. However, despite the sub-diffractive operation of dielectric metasurfaces at the fundamental wave, this condition is not fulfilled for the nonlinearly generated harmonic waves, thereby all nonlinear metasurfaces to date emit multiple diffractive beams. Here, we demonstrate the enhanced single-beam second- and third-harmonic generation in a metasurface of crystalline transition-metal-dichalcogenide material, offering the highest refractive index. We show that the interplay between the resonances of the metasurface allows for tuning of the unidirectional second-harmonic radiation in forward or backward direction, not possible in any bulk nonlinear crystal. Our results open new opportunities for metasurface-based nonlinear light-sources, including nonlinear mirrors and entangled-photon generation.

scholarly journals Very High Refractive Index Transition Metal Dichalcogenide Photonic Conformal Coatings by Conversion of ALD Metal Oxides

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Christopher T. Chen ◽  
Jacopo Pedrini ◽  
E. Ashley Gaulding ◽  
Christoph Kastl ◽  
Giuseppe Calafiore ◽  
...  
Keyword(s):  
Refractive Index ◽  
Transition Metal ◽  
Metal Oxides ◽  
High Refractive Index ◽  
Transition Metal Dichalcogenide ◽  
Conformal Coatings ◽  
Very High

Transition Metal Dichalcogenide Nanoantennas Lattice

MRS Advances ◽  
2019 ◽  
Vol 4 (41-42) ◽  
pp. 2283-2288 ◽  
Author(s):  
Viktoriia E. Babicheva
Keyword(s):  
Refractive Index ◽  
Transition Metal ◽  
Near Infrared ◽  
Building Blocks ◽  
High Refractive Index ◽  
Photonic Devices ◽  
Transition Metal Dichalcogenide ◽  
Optical Resonances ◽  
Infrared Spectral ◽  
Spectral Ranges

ABSTRACTHigh-index materials such as silicon and III-V compounds have recently gained a lot of interest as a promising material platform for efficient photonic nanostructures. Because of the high refractive index, nanoparticles of such materials support Mie resonances and enable efficient light control and its confinement at the nanoscale. Here we propose a design of nanostructure with multipole resonances where optical nanoantennas are made out of transition metal dichalcogenide, in particular, tungsten disulfide WS2. Transition metal dichalcogenide (TMDCs) possess a high refractive index and strong optical anisotropy because of their layered structure and are promising building blocks for next-generation photonic devices. Strong anisotropic response results in different components of TMDC permittivity and the possibility of tailoring nanostructure optical properties by choosing different axes and adjusting dimensions in design. The proposed periodic array of TMDC nanoantennas can be used for controlling optical resonances in the visible and near-infrared spectral ranges and engineering efficient ultra-thin optical components with nanoscale light confinement.

scholarly journals Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

2021 ◽  
Vol 3 (1) ◽  
pp. 272-278
Author(s):  
Pilar G. Vianna ◽  
Aline dos S. Almeida ◽  
Rodrigo M. Gerosa ◽  
Dario A. Bahamon ◽  
Christiano J. S. de Matos
Keyword(s):  
Dielectric Constant ◽  
Transition Metal ◽  
Harmonic Generation ◽  
Nonlinear Effect ◽  
Second Harmonic ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Metal Dichalcogenides ◽  
Epsilon Near Zero

The scheme illustrates a monolayer transition-metal dichalcogenide on an epsilon-near-zero substrate. The substrate near-zero dielectric constant is used as the enhancement mechanism to maximize the SHG nonlinear effect on monolayer 2D materials.

scholarly journals Giant Gating Tunability of Optical Refractive Index in Transition Metal Dichalcogenide Monolayers

Nano Letters ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 3613-3618 ◽  
Author(s):  
Yiling Yu ◽  
Yifei Yu ◽  
Lujun Huang ◽  
Haowei Peng ◽  
Liwei Xiong ◽  
...  
Keyword(s):  
Refractive Index ◽  
Transition Metal ◽  
Transition Metal Dichalcogenide

scholarly journals Coated High-Refractive-Index Barium Titanate Glass Microspheres for Optically Trapped Microsphere Super-Resolution Microscopy: A Simulation Study

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 84
Author(s):  
Xi Liu ◽  
Song Hu ◽  
Yan Tang
Keyword(s):  
Refractive Index ◽  
Barium Titanate ◽  
Optical Trapping ◽  
Super Resolution ◽  
High Refractive Index ◽  
Trapping Efficiency ◽  
Single Beam ◽  
Imaging Performance ◽  
Super Resolution Microscopy ◽  
Optically Trapped

As water is normally used as the immersion medium in optically trapped microsphere microscopy, the high-refractive-index barium titanate glass (BTG) microsphere shows a better imaging performance than the low-index polystyrene (PS) or melamine formaldehyde (MF) microsphere, but it is difficult to be trapped by single-beam optical trapping due to its overly high refractive index. In this study, coated BTG microspheres with a PS coating have been computationally explored for the combination of optical trapping with microsphere-assisted microscopy. The PS coating thickness affects both the optical trapping efficiency and photonic nanojet (PNJ) property of the coated BTG sphere. Compared to the uncoated BTG sphere, the coated BTG sphere with a proper PS coating thickness has a highly improved trapping efficiency which enables single-beam optical trapping, and a better PNJ with a higher optical intensity Imax and a narrower full width at half maximum (FWHM) corresponding to better imaging performance. These coated BTG spheres also have an advantage in trapping efficiency and imaging performance over conventional PS and MF spheres. The coated BTG microsphere is highly desirable for optically trapped microsphere super-resolution microscopy and potentially beneficial to other research areas, such as nanoparticle detection.

Second Harmonic Generation from Artificially Stacked Transition Metal Dichalcogenide Twisted Bilayers

ACS Nano ◽  
2014 ◽  
Vol 8 (3) ◽  
pp. 2951-2958 ◽  
Author(s):  
Wei-Ting Hsu ◽  
Zi-Ang Zhao ◽  
Lain-Jong Li ◽  
Chang-Hsiao Chen ◽  
Ming-Hui Chiu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Transition Metal Dichalcogenide
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