Specialty Fibers for Terahertz Generation and Transmission: A Review

Barh, Ajanta; Pal, Bishnu P.; Agrawal, Govind P.; Varshney, R. K.; Rahman, B. M. A.

doi:10.1109/jstqe.2015.2494537

Cited by 65 publications

(30 citation statements)

References 192 publications

(184 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, those are demonstrated in microwave or lower frequency range and are difficult to fabricate in higher frequency regime. [18,19] Here, we have demonstrated Fano resonance in vertically stacked bilayer geometrically symmetric resonators based…”

mentioning

confidence: 83%

See 1 more Smart Citation

Deep‐Subwavelength Coupling‐Induced Fano Resonances in Symmetric Terahertz Metamaterials

Karmakar

Banerjee

Kumar

et al. 2019

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

Fano resonances in metamaterials attract intense attention due to their sharp asymmetric spectral feature and low radiative loss channel. Typically, Fano resonances are excited in metamaterials with broken structural symmetry in a planar configuration. Herein, the excitation of Fano resonance in geometrically symmetric metamaterial structure operating in the strong, deep sub‐wavelength coupling regime at terahertz frequencies is experimentally demonstrated. The structure consists of vertically stacked symmetric resonator array separated by an ultrathin polyimide spacer. Such meta‐structures can strongly support highly localized, intense electromagnetic field confined inside the sub‐wavelength volumes. It is further shown that the resonance linewidth and the field strengths can be engineered by tailoring the near‐field coupling through the ultrathin spacer layer. Such exotic features of perfectly symmetric Fano resonators provide an ideal playing ground for strong light–matter coupling, resulting in realization of ultrasensitive sensors, slow‐light devices, and energy‐efficient ultrafast terahertz modulators.

show abstract

mentioning

confidence: 83%

“…However, such structures have lower field confinement, lossy, and show low Q resonances. Moreover, those are demonstrated in microwave or lower frequency range and are difficult to fabricate in higher frequency regime …”

mentioning

confidence: 99%

Deep‐Subwavelength Coupling‐Induced Fano Resonances in Symmetric Terahertz Metamaterials

Karmakar

Banerjee

Kumar

et al. 2019

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

show abstract

“…A variety of types of hollow waveguides have been studied for THz, which may be separated into metallic, dielectric and hybrid waveguides (including metamaterial waveguides). 3,4,5,6,7,8,9 Metallic hollow waveguides can have subwavelength cross-section and have relatively low loss. Those characteristics arguably make them the current best option for THz waveguides.…”

Section: Introductionmentioning

confidence: 99%

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

2018

View full text Add to dashboard Cite

THz radiation is more and more commonplace in research laboratories as well as in everyday life, with applications ranging from body scanners at airport security to short range wireless communications. In the optical domain, waveguides and other devices to manipulate radiation are well established. This is not yet the case in the THz regime because of the strong interaction of THz radiation with matter, leading to absorption, and the millimeter size of the wavelength and therefore of the required waveguides. We propose the use of a new material, polyurethane, for waveguides that allows high flexibility, overcoming the problem that large sizes otherwise result in rigid structures. With this material we realize antiresonant hollow-core waveguides and we use the flexibility of the material to mechanically twist the waveguide in a tunable and reversible manner, with twist periods as short as tens of wavelengths. Twisting the waveguide, we demonstrate the generation of modes carrying orbital angular momentum. We use THz time domain spectroscopy to measure and clearly visualize the vortex nature of the mode, which is difficult in the optical domain. The proposed waveguide is a new platform offering new perspectives for THz guidance and particularly mode manipulation. The demonstrated ability to generate modes with orbital angular momentum within a waveguide, in a controllable manner, will be beneficial to both fundamental, e.g. matter-radiation interaction, and applied, e.g. THz telecommunications, advances of THz research and technology. Moreover, this platform is not limited to the THz domain and could be scaled for other electromagnetic wavelengths.

show abstract

“…Several waveguide solutions based on technologies from both electronics and photonics have been proposed [38][39][40][41][42]; among these hollow core waveguides are one of the best options for guiding THz radiation due to the very low material absorption of air. However, hollow core waveguides suffer from multimode operation as they have a core diameter larger than the operating wavelength to minimize reflection losses [43][44][45][46][47].…”

Section: Hollow Core Waveguides With Metamaterials Claddingmentioning

confidence: 99%

Fiber-Drawn Metamaterial for THz Waveguiding and Imaging

Atakaramians

Stefani

et al. 2017

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

In this paper we review the work of our group in fabricating metamaterials for terahertz (THz) applications by fiber drawing. We discuss the fabrication technique and the structures that can be obtained before focusing on two particular applications of terahertz metamaterials, i.e. waveguiding and sub-diffraction imaging. We show the experimental demonstration of THz radiation guidance through hollow core waveguides with metamaterial cladding, where substantial improvements were realised compared to conventional hollow core waveguides, such as reduction of size, greater flexibility, increased single mode operating regime and guiding due to magnetic and electric resonances. We also report recent and new experimental work on near-and far-field THz imaging using wire array metamaterials that are capable of resolving features as small as λ/28.

show abstract

Specialty Fibers for Terahertz Generation and Transmission: A Review

Cited by 65 publications

References 192 publications

Deep‐Subwavelength Coupling‐Induced Fano Resonances in Symmetric Terahertz Metamaterials

Deep‐Subwavelength Coupling‐Induced Fano Resonances in Symmetric Terahertz Metamaterials

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

Fiber-Drawn Metamaterial for THz Waveguiding and Imaging

Contact Info

Product

Resources

About