A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector

Qiu, Fucheng; You, Guofeng; Tan, Zhongxin; Wan, Wen‐Ming; Wang, Chang; Liu, Xiao; Chen, Xinzhong; Li, Rui; Tao, Hu; Fu, Zhanglong; Li, Hua; Cao, Juncheng

doi:10.1016/j.isci.2022.104637

Cited by 11 publications

(3 citation statements)

References 46 publications

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“…semiconductor materials and heterostructures. Due to their high coherence and narrow line-width [3,4] properties, QCLs are attractive for high-speed secure communication systems [5][6][7] and nondestructive imaging applications [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

Wei

Liu

feng

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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Based on rate equations, we mainly simulate the transient instability characteristics of a 8 µm quantum cascade laser (QCL) subject to optical injection with AC electrical modulation. Simulation results have shown that the 1-periodic oscillation of optical injection-locked QCL is brokenby applying an AC current to the DC bias. Combining external optical injection and induced period current modulation can cause 1-period oscillation dropouts and display chaotic states outside the stable locking region, owing to the cooperative interplay between AC frequency and the periodic oscillation frequency caused by optical injection. To give a clear physical picture of the chaos under different linewidth enhancement factor, we use temporal series, Poincar´e bifurcation diagram, Fourier spectra, phase portraits and first return maps to analyze carefully. These analytical methods are effective for the dynamical behaviors of QCLs with low LEF, which shows that chaos of QCLs strongly rely on external modulation compared with class-B laser systems. This work paves a new way for realizing chaotic signal generation and have an important application in secure communication in mid-infrared and terahertz frequency band.

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Section: Introductionmentioning

confidence: 99%

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

Wei

Liu

feng

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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“…THz time-domain spectroscopy (THz-TDS) based on photoconducting dipole antennas was invented and used in the measurement of bulk materials. , The THz wave band is opaque to metals and water, strongly absorbed by some molecules, , and transparent to most dielectric materials. THz imaging − and fingerprint technology , are appealing for wide usage in the future. THz waves are sensitive to low-energy phenomena in bulk matter and molecules.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Nanoscopy of Metal and Gallium Implanted Silicon

Wang

You

et al. 2023

ACS Appl. Opt. Mater.

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The Drude model successfully quantifies the optical constants for bulk matter, but it is not suitable for subwavelength objects. In this paper, terahertz near-field optical microscopy and finite element simulation are used to study gallium-etching-fabricated gold patches. Electron transport is discovered to determine the optical signal strength. However, the signal from the substrate is complicated and not fully understood. When the etching area decreases, the near-field interaction is not dominated by the doping concentration, and a higher signal is observed near connected metals. Simulation is used to discuss the anomalous enhancement phenomenon, which includes electric field distribution and electromagnetic heating. This work lays the foundation for more sophisticated simulations and further experimental verification in the future.

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“…2,3 Because THz wave band is opaque to metals and water, strongly absorbed by some molecules 4,5 and transparent to most dielectric materials. THz imaging [6][7][8][9][10] and fingerprint technology 11,12 are appealing to widely usage in the future. THz wave is sensitive to low-energy phenomena in bulk matters and molecules.…”

Section: Introductionmentioning

confidence: 99%

THz Nanoscopy of Metal and Gallium Implanted Silicon

Wu¹,

You²,

Wang³

et al. 2022

Preprint

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Drude model successfully quantifies the optical constants for bulk matters, but it is not suitable for sub-wavelength objects. In this paper, near-field optics microscopy and finite element simulation are used to study the gold patches of different connected states in the terahertz spectrum. Electron transportation is discovered in determining optical properties of micron conductors. As the sample size decreases, near-field interaction becomes more complex, and abnormal signal enhancement is observed on the substrate.With the help of simulation, the phenomenon of abnormal enhancement is discussed in detail, which lays the foundation for further experimental verification.

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A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector

Cited by 11 publications

References 46 publications

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

Transient nonlinear dynamics in an electrically modulated quantum cascade laser with optical injection

Terahertz Nanoscopy of Metal and Gallium Implanted Silicon

THz Nanoscopy of Metal and Gallium Implanted Silicon

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