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Terahertz (THz) lasers on optically pumped multiple-graphene-layer (MGL) structures as their active region are proposed and evaluated. The developed device model accounts for the interband and intraband transitions in the degenerate…

Mesoscale and Nanoscale Physics · Physics 2015-05-14 V. Ryzhii , A. A. Dubinov , T. Otsuji , V. Mitin , M. S. Shur

Time series are ubiquitous in many applications that involve forecasting, classification and causal inference tasks, such as healthcare, finance, audio signal processing and climate sciences. Still, large, high-quality time series datasets…

Machine Learning · Computer Science 2025-11-25 Yu-Hsiang Wang , Olgica Milenkovic

Modern spectral synthesis codes need the thermally averaged free-free Gaunt factor defined over a very wide range of parameter space in order to produce an accurate prediction for the spectrum emitted by an ionized plasma. Until now no set…

High Energy Astrophysical Phenomena · Physics 2014-08-19 P. A. M. van Hoof , R. J. R. Williams , K. Volk , M. Chatzikos , G. J. Ferland , M. Lykins , R. L. Porter , Y. Wang

This paper develops a theory of graph classification under domain shift through a random-graph generative lens, where we consider intra-class graphs sharing the same random graph model (RGM) and the domain shift induced by changes in RGM…

Machine Learning · Computer Science 2026-03-02 Zhang Wan , Tingting Mu , Samuel Kaski

We propose and demonstrate a novel method for generating propagation-invariant spatially-stationary fields in a controllable manner. Our method relies on producing incoherent mixtures of plane waves using planar primary sources that are…

We present a method to measure quadratic Terahertz optical nonlinearities in Terahertz time-domain spectroscopy. We use a rotating linear polarizer (a polarizing chopper) to modulate the amplitude of the incident THz pulse train. We use a…

Applied Physics · Physics 2018-10-16 Shuai Lin , Shukai Yu , Diyar Talbayev

The unique terahertz properties of graphene has been identified for novel optoelectronic applications. In a graphene sample with bias voltage added, there is an enhanced absorption in the far infrared region and a diminished absorption in…

Mesoscale and Nanoscale Physics · Physics 2017-05-18 Yuan Yang , Grigory Kolesov , Lucas Kocia , Eric J. Heller

Optical rectification is demonstrated in (110)-cut ZnGeP_2 (ZGP) providing broadband terahertz (THz) generation. The source is compared to both GaP and GaAs over a wavelength range of 1150 nm to 1600 nm and peak intensity range of 0.5…

Being the most cutting-edge generative methods, diffusion methods have shown great advances in wide generation tasks. Among them, graph generation attracts significant research attention for its broad application in real life. In our…

Machine Learning · Computer Science 2024-07-17 Hongyang Chen , Can Xu , Lingyu Zheng , Qiang Zhang , Xuemin Lin

Based on spatial-temporal symmetry breaking mechanism, we propose a novel scheme for terahertz (THz) wave generation from hyper-Raman lines associated with the 0th harmonic (a particular even harmonic) in a two-level quantum system driven…

Optics · Physics 2015-06-03 Wei Zhang , Shi-Fang Guo , Su-Qing Duan , Xian-Geng Zhao

Digital revolution and recent advances in telecommunications technology enable to design communication systems which operate within the regions close to the theoretical capacity limits. Ever-increasing demand for wireless communications and…

Information Theory · Computer Science 2017-08-01 Ali Rıza Ekti , Ali Boyacı , Altan Alparslan , Ilhami Unal , Serhan Yarkan , Ali Gorcin , Huseyin Arslan , Murat Uysal

We explore the dynamics of a system where input spectra in the optical domain with very disparate center frequencies are strongly coupled via highly phase-matched, cascaded second-order nonlinear processes driven by terahertz radiation. The…

Optics · Physics 2019-07-08 Koustuban Ravi , Franz X. Kärtner

This paper presents a novel spectrum allocation strategy for multiuser terahertz (THz) band communication systems when the to-be-allocated spectrum is composed of multiple transmission windows (TWs). This strategy explores the benefits of…

Signal Processing · Electrical Eng. & Systems 2024-10-28 Akram Shafie , Nan Yang , Chong Han , Josep M. Jornet

Domain generalization (DG), aiming at models able to work on multiple unseen domains, is a must-have characteristic of general artificial intelligence. DG based on single source domain training data is more challenging due to the lack of…

Computer Vision and Pattern Recognition · Computer Science 2023-04-17 Qingyue Yang , Hongjing Niu , Pengfei Xia , Wei Zhang , Bin Li

We calculate high-harmonic generation (HHG) by intense infrared lasers in atoms and molecules with the inclusion of macroscopic propagation of the harmonics in the gas medium. We show that the observed experimental spectra can be accurately…

We present a method that formally calculates \emph{exact} frequency shifts of an electromagnetic field for arbitrary changes in the refractive index. The possible refractive index changes include both anisotropic changes and boundary…

Optics · Physics 2007-05-23 Lars Rindorf , Niels Asger Mortensen

A method for constructing optical potentials with an arbitrary distribution of gain and loss and completely real spectrum is presented. For each arbitrary distribution of gain and loss, several classes of refractive-index profiles with…

Optics · Physics 2016-03-23 Sean Nixon , Jianke Yang

Broadband ultrashort terahertz (THz) pulses can be produced using plasma generation in a noble gas ionized by femtosecond two-color pulses. Here we demonstrate that, by using multiple-frequency laser pulses, one can obtain a waveform which…

Terahertz nonlinear optics is a viable method to interrogate collective phenomena in quantum materials spanning ferroelectrics, charge-density waves, and superconductivity. In superconductors this includes the Higgs amplitude and Josephson…

Superconductivity · Physics 2024-03-19 Kelson Kaj , Kevin A. Cremin , Ian Hammock , Jacob Schalch , Dmitri N. Basov , Richard D. Averitt

We study the generation of terahertz radiation from atoms and molecules driven by an ultrashort fundamental laser and its second harmonic field by solving time-dependent Schr\"odinger equation (TDSE). The comparisons between one-, two-, and…