4.6 Review

Roadmap of Terahertz Imaging 2021

Related references

Note: Only part of the references are listed.
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A Review of the Concept, Applications and Implementation Issues of Terahertz Spectral Imaging Technique

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Summary: This review explores the fundamental physics, important applications, experimental implementations, and image analyses issues of the spectral imaging technique in the THz band. It also discusses the challenges related to spectral noise, long image acquisition times, and limited portability and customizability of systems based on this technique in various real-world scenarios.

IETE TECHNICAL REVIEW (2022)

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Electro-thermal and optical characterization of an uncooled suspended bolometer based on an epitaxial La0.7Sr0.3MnO3 film grown on CaTiO3/Si

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Summary: The study presents the electro-thermal and optical properties of a bolometer based on an LSMO thin film with a detection area of 100 x 100 μm². Through measurements and calculations, it shows promising potential for the use of LSMO-based bolometers in IR or THz detection, given its low noise equivalent power and response time.

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Deep learning for the design of photonic structures

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Homogeneous quantum cascade lasers operating as terahertz frequency combs over their entire operational regime

Alessandra Di Gaspare et al.

Summary: This paper reports a homogeneous quantum cascade laser operating at terahertz frequencies, with high power and stability, serving as an optical frequency comb synthesizer. Experimental results demonstrate the advantages of this laser, including high power levels and stable operation characteristics.

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Quantitative sampling of atomic-scale electromagnetic waveforms

D. Peller et al.

Summary: The article introduces a new method for sampling waveforms at the atomic scale to determine tip-confined near-field transients, with measurements and calibrations using a quantum-level atomic waveform sampler to understand and validate the effectiveness of this method. The study reveals the impact of local quantum dynamics on femtosecond atomic near fields, accessing an uncharted domain of nano-opto-electronics.

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The Magic of Optics-An Overview of Recent Advanced Terahertz Diffractive Optical Elements

Agnieszka Siemion

Summary: Diffractive optical elements are characterized by their flat and lightweight properties, with low attenuation, providing better efficiency in some cases compared to refractive lenses. Terahertz optical structures based on diffractive design exist, with optimization methods such as neural networks to effectively control phase changes.

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Terahertz pulse shaping using diffractive surfaces

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Summary: Recent advances in deep learning have provided non-intuitive solutions to inverse problems in optics. Diffractive networks merge wave-optics with deep learning to design task-specific elements for all-optically performing tasks like object classification. The authors present a diffractive network used to shape broadband pulses into desired optical waveforms, demonstrating direct pulse shaping in the terahertz spectrum.

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Tunnel field-effect transistors for sensitive terahertz detection

I. Gayduchenko et al.

Summary: The research addresses the challenge of ac-to-dc conversion in the sub-terahertz domain using tunnel field-effect transistors made of bilayer graphene. By creating a lateral tunnel junction and coupling it to an antenna exposed to THz radiation, high responsivity and low-noise detection are achieved. Switching from intraband Ohmic to interband tunneling regime significantly increases detectors' responsivity, showing the potential application of tunnel transistors for THz detection and the promising platform of BLG.

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Tunable terahertz perfect absorber with a graphene-based double split-ring structure

Zhendong Wu et al.

Summary: This paper introduces a tunable perfect absorber based on a graphene metamaterial, with dynamic control over absorption peaks by manipulating the permittivity of graphene and relaxation time. It shows great potential in applications such as infrared, filtering, and terahertz detection.

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A Passive, Fully Staring THz Video Camera Based on Kinetic Inductance Bolometer Arrays

Juho Luomahaara et al.

Summary: Current state-of-the-art security video cameras in the THz regime typically use multiple detectors and optomechanical scanning, but this can impact sensitivity, complexity, and reliability. In contrast, a new video camera has been demonstrated utilizing a fully staring 2-D detector array with single detector elements for each imaged pixel, based on kinetic inductance bolometer technology for higher resolution and practical concealed object detection.

IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY (2021)

Article Nanoscience & Nanotechnology

Terahertz Scanning Tunneling Microscopy for Visualizing Ultrafast Electron Motion in Nanoscale Potential Variations

Shoji Yoshida et al.

Summary: This study investigated the ultrafast electron dynamics in nanoscale structures, using time-resolved scanning tunneling microscopy/spectroscopy combined with a carrier-envelope phase-controlled subcycle THz electric field. The research successfully visualized electron motion triggered by variation in the lowest unoccupied molecular orbital and distinguished effects of molecular defects with single-molecular-level spatial resolution. This method is expected to play a vital role in evaluating local electronic structures and dynamics for the development of future functional materials and devices.

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Homodyne Spectroscopy with Broadband Terahertz Power Detector Based on 90-nm Silicon CMOS Transistor

Kestutis Ikamas et al.

Summary: Research has shown that by using the homodyne detection principle and combining broadband power detectors with two photomixer sources, the signal-to-noise ratio of THz systems can be improved, supporting spectroscopic evidence for water vapor lines and demonstrating the suitability of these detectors for practical continuous wave THz spectrometry systems.

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There is Plenty of Room for THz Tunneling Electron Devices Beyond the Transit Time Limit

Matteo Villani et al.

Summary: A novel time-dependent displacement current coefficient is proposed to replace the traditional transmission coefficient for frequencies above a certain limit. The study shows that tunneling electron devices exhibit intrinsic nonlinearity at high frequencies, leading to potential advantages in THz applications.

IEEE ELECTRON DEVICE LETTERS (2021)

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A 220-to-320-GHz FMCW Radar in 65-nm CMOS Using a Frequency-Comb Architecture

Xiang Yi et al.

Summary: This article introduces a CMOS-based ultra-wideband FMCW radar using a terahertz frequency-comb architecture. The radar prototype seamlessly scans the 220-to-320 GHz band, demonstrating good performance in measurements. The chip achieves record bandwidth and ranging resolution among radar front-end chips.

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Waveform sampling on an atomic scale

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Masahiro Asada et al.

Summary: This paper reviews recent progress in resonant-tunneling diode (RTD) terahertz (THz) oscillators, which are compact semiconductor THz sources, including principles and characteristics of oscillation, studies addressing high-frequency and high output power, a structure which can easily be fabricated, frequency tuning, spectral narrowing, different polarizations, and select applications. Fundamental oscillation up to 1.98 THz and output power of 0.7 mW at 1 THz by a large-scale array have been reported, with structures integrated with cylindrical and rectangular cavities proposed for high-frequency and high output power. Wide electrical tuning of 400-900 GHz has been demonstrated using oscillators integrated with varactor diodes and their arrays. A line width as narrow as 1 Hz has been obtained for spectral narrowing through use of a phase-locked loop system with a frequency-tunable oscillator. Basic research for various applications of RTD oscillators has been carried out, with discussion of recent results related to imaging, spectroscopy, high-capacity wireless communication, and radar systems.

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Machine Learning Techniques for THz Imaging and Time-Domain Spectroscopy

Hochong Park et al.

Summary: Machine learning plays a crucial role in terahertz imaging and time-domain spectroscopy, enabling enhanced performance and extraction of more information.

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Terahertz Signal Source and Receiver Operating Near 600 GHz and Their 3-D Imaging Application

Jungsoo Kim et al.

Summary: This article presents oscillators and a heterodyne image receiver operating near 600 GHz using InP HBT and SiGe HBT technologies, showing their performance in the terahertz range. The oscillators achieved tuning capability and high output power, while the heterodyne receiver demonstrated excellent responsivity and noise equivalent power.

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Summary: The study focused on resolving weakly absorbing objects in terahertz imaging by enhancing image contrast and signal-to-noise ratio through phase contrast and dark field methods. The application of these methods opens a promising route for functional applications.

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