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Frequency-switching Array Enhanced Physical-Layer Security in Terahertz Bands: A Movable Antenna Perspective
Cong Zhou, Changsheng You, Shuo Shi, Weidong Mei
https://arxiv.org/abs/2507.01624

Frequency-switching Array Enhanced Physical-Layer Security in Terahertz Bands: A Movable Antenna Perspective
In this paper, we propose a new frequency-switching array (FSA) enhanced physical-layer security (PLS) system in terahertz bands, where the carrier frequency can be flexibly switched and small frequency offsets can be imposed on each antenna at Alice, so as to eliminate information wiretapping by undesired eavesdroppers. First, we analytically show that by flexibly controlling the carrier frequency parameters, FSAs can effectively form uniform/non-uniform sparse arrays, hence resembling movable…

Theory of terahertz pulse transmission through ferroelectric nanomembranes
Yujie Zhu, Aiden Ross, Xiangwei Guo, Venkatraman Gopalan, Long-Qing Chen, Jia-Mian Hu
https://arxiv.org/abs/2506.00370

Theory of terahertz pulse transmission through ferroelectric nanomembranes
An analytical model is developed to predict the temporal evolution of the lattice polarization in ferroelectric nanomembranes upon the excitation by a terahertz (THz) electromagnetic pulse of an arbitrary waveform, and the concurrent transmission of the THz pulse in both the linear and the nonlinear regimes. It involves the use of the perturbation method to solve the equation of motion for the lattice polarization in both unclamped and strained ferroelectric nanomembranes within the framework o…

Terahertz Chip-Scale Meta-Networks with LSPR Routing: A Theoretical Framework
Maryam Khodadadi, Hamidreza Taghvaee, Pei Xiao, Gabriele Gradoni, Mohsen Khalily
https://arxiv.org/abs/2507.02764

Terahertz Chip-Scale Meta-Networks with LSPR Routing: A Theoretical Framework
Efficient chip-scale interconnects are essential for modern microelectronic-photonic systems, supporting high bandwidth and low-latency processing. Traditional wired links face high resistivity and latency, while millimeter-wave wireless solutions suffer from bandwidth congestion and interference. Terahertz (THz) plasmonic communication, based on surface plasmon polaritons (SPPs), offers high data rates and broad bandwidth, and is compatible with nanophotonic platforms. This work introduces a B…

Unlocking Quantum Control and Multi-Order Correlations via Terahertz Two-Dimensional Coherent Spectroscopy
Chuankun Huang, Martin Mootz, Liang Luo, Ilias E. Perakis, Jigang Wang
https://arxiv.org/abs/2507.02116

Unlocking Quantum Control and Multi-Order Correlations via Terahertz Two-Dimensional Coherent Spectroscopy
Terahertz two-dimensional coherent spectroscopy (THz-2DCS) is transforming our ability to probe, visualize, and control quantum materials far from equilibrium. This emerging technique brings multi-dimensional resolution to the ultrafast dynamics of nonequilibrium phases of matter, enabling new capabilities demanding precise coherent control and measurement of many-body dynamics and multi-order correlations. By mapping complex excitations across time and frequency dimensions, THz-2DCS delivers c…

Observation of terahertz spin-Hall magnetoresistance in insulating magnet YIG/Pt
P. Kuba\v{s}\v{c}\'ik, R. Schlitz, O. Gueckstock, O. Franke, M. Borchert, G. Jakob, K. Olejn\'ik, A. Farka\v{s}, Z. Ka\v{s}par, J. Jechumt\'al, M. Bu\v{s}ina, E. Schmoranzerov\'a, P. N\v{e}mec, M. Wolf, Y. Z. Wu, G. Woltersdorf, M. Kl\"aui, P. W. Brouwer, S. T. B. Goennenwein, T. Kampfrath, L. N\'advorn\'ik

Observation of terahertz spin-Hall magnetoresistance in insulating magnet YIG/Pt
We report on the observation of spin Hall magnetoresistance (SMR) in prototypical bilayers of ferrimagnetic yttrium iron garnet (YIG) and platinum in the frequency range from 0 THz to as high as 1.5 THz. The spectral composition of the effect exhibits a strong low-pass behavior, decreasing by approximately 75% from 0 THz to 0.2 THz and vanishing entirely at 1.5 THz. Using a dynamic magnetoresistive model, we can fully explain the spectral dependence by competition of transverse spin-torque (coh…

Terahertz source-on-a-chip with decade-long stability using layered superconductor elliptical microcavities
Mingqi Zhang, Shungo Nakagawa, Yuki Enomoto, Yoshihiko Kuzumi, Ryuta Kikuchi, Yuki Yamauchi, Toshiaki Hattori, Richard A. Klemm, Kazuo Kadowaki, Takanari Kashiwagi, Kaveh Delfanazari
https://arxiv.org/abs/2506.22811…

Terahertz source-on-a-chip with decade-long stability using layered superconductor elliptical microcavities
Coherent, continuous-wave, and electrically tunable chip-scale terahertz (THz) sources are critical for emerging applications in sensing, imaging, spectroscopy, communication, space and quantum technologies. Here, we demonstrate a robust source-on-a-chip THz emitter based on a layered high-temperature superconductor, engineered with an elliptical microcavity and capable of sustained coherent emission over an unprecedented operational lifetime exceeding 11 years. This compact THz source operates…

Direct Reconstruction of Terahertz-driven Subcycle Electron Emission Dynamics
Jiakang Mao, Yushan Zeng, Hongyang Li, Liwei Song, Ye Tian, Ruxin Li
https://arxiv.org/abs/2507.02397

Direct Reconstruction of Terahertz-driven Subcycle Electron Emission Dynamics
While field-driven electron emission is theoretically understood down to the subcycle regime, its direct experimental temporal characterization using long-wavelength terahertz (THz) fields remains elusive. Here, by driving a graphite tip with phase-stable quasi-single-cycle THz pulses, we reveal distinct subcycle electron emission dynamics including: (1) At a carrier-envelope phase (CEP) near zero, spectral peaks scale linearly with THz field strength, characteristic of subcycle emission; (2) A…

Orthogonal Frequency Division Multiplexing Continuous Variable Terahertz Quantum Key Distribution
Mingqi Zhang, Kaveh Delfanazari
https://arxiv.org/abs/2506.22985

Orthogonal Frequency Division Multiplexing Continuous Variable Terahertz Quantum Key Distribution
We propose a novel continuous-variable quantum key distribution (CVQKD) protocol that employs orthogonal frequency-division multiplexing (OFDM) in the terahertz (THz) band to enable high-throughput and secure quantum communication. By encoding quantum information across multiple subcarriers, the protocol enhances spectral efficiency and mitigates channel dispersion and atmospheric attenuation. We present a comprehensive security analysis under collective Gaussian attacks, considering both terre…

Windowing in terahertz time-domain spectroscopy: resolving resonances in thin-film samples
Esteban Marulanda, Fernanda L. Costa, Nicolas M. Kawahala, Felix G. G. Hernandez
https://arxiv.org/abs/2507.00729

Windowing in terahertz time-domain spectroscopy: resolving resonances in thin-film samples
Terahertz time-domain spectroscopy (THz-TDS) has become a powerful tool for investigating the optical properties of thin films, offering direct access to the complex permittivity in the terahertz range. However, in transmission-based measurements of thin films on thick substrates, multiple reflections and limited time windows can introduce artifacts that obscure resonant features such as phonon modes. Time-domain windowing is widely employed to mitigate these effects, yet systematic guidelines …