An Ultrafast Switchable Terahertz Polarization Modulator Based on III–V Semiconductor Nanowires

Baig, Sarwat E.; Boland, Jessica L.; Damry, Djamshid A.; Tan, Hark Hoe; Jagadish, Chennupati; Joyce, Hannah J.; Johnston, Michael B.

doi:10.1021/acs.nanolett.7b00401

Cited by 85 publications

(54 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These devices when bent to match conformal surfaces can reasonably retain their electromagnetic properties. Examples of most commonly used flexible polymer dielectric materials, as substrates or spacers, include polydimethylsiloxane (PDMS), polyimide (commercially supplied as Kapton), polyethylene terephthalate (PET), parylene‐C, cyclic olefin copolymer (COC), etc. The properties specific to each polymeric material and its challenges in fabrication are discussed and addressed.…”

Section: Fabrication Of Single and Multilayer Terahertz Metasurface Dmentioning

confidence: 99%

“…Common examples include 2.2 paracyclophane dimer (parylene‐N) or the inclusion of one or two chlorine (Cl 2 ) atoms in 2.2 paracyclophane for parylene‐C and parylene‐D, respectively. The dielectric properties of parylene‐C have shown low‐loss performance in the terahertz regime . Moreover, it can withstand high temperatures in the range −200 to 200 °C.…”

Section: Fabrication Of Single and Multilayer Terahertz Metasurface Dmentioning

confidence: 99%

“…Such materials can be engineered in an array configuration to modulate the transmission and reflection amplitude, phase or polarization of an incident terahertz wave, or actively switch resonant frequency. In this category, moderately doped silicon, compound III–V semiconductors, 2D materials and van der Waal heterostructures, III–V semiconductor and carbon nanotubes and nanowires, and oxide nanospheres have been demonstrated to exhibit active response in the terahertz regime.…”

Section: Lossless Dielectric Materialsmentioning

confidence: 99%

“…Baig et al have demonstrated terahertz transmission and polarizer modulation realized with aligned GaAs nanowires embedded in parylene‐C (Figure c(i,ii)). The anisotropic geometry, high charge carrier mobility, and ultrafast carrier charge decay of GaAs nanowires embedded in parylene‐C are utilized to modulate the polarization (Figure c(iii)) and transmission intensity (Figure c(iv)) of an incident terahertz beam, enabled by a polarization‐dependent light pump and fluence between 6 and 28 µJ cm −2 …”

Section: Lossless Dielectric Materialsmentioning

confidence: 99%

Section: Lossless Dielectric Materialsmentioning

confidence: 99%

See 4 more Smart Citations

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Ako

Upadhyay

Withayachumnankul

et al. 2019

Advanced Optical Materials

105

View full text Add to dashboard Cite

on distinctive spectral signatures resulting from vibrational modes of covalent and hydrogen bonds. [8,[13][14][15][16] The focus on this spectrally rich region is attributed to the highly coherent and nonionizing nature of terahertz radiation, wide unallocated frequency bands, distinctive wavelengths, and their penetration through a significant depth of dielectric materials. Terahertz technology is geared toward realizing devices that can efficiently manipulate the phase, amplitude, and polarization of terahertz radiations for the above-mentioned myriad of applications.However, progress in this domain is held back by low terahertz power available from compact sources, high free-space path loss, and limited choice of materials that exhibit less absorption of terahertz waves. [17] Owing to the fact that natural materials demonstrate weak wave-matter interaction at terahertz frequencies, terahertz devices with engineered subwavelength resonant metallic inclusions on dielectric spacers have been realized, to interact strongly with an incident electromagnetic wave.In the past, metamaterials have been a promising route to building terahertz devices. These devices have in essence been engineered as 3D resonating elements that effectively manipulate both permittivity and permeability of an effective medium to couple to free space. The underlining disadvantage of these structures is the difficulty involved in the fabrication of 3D geometrical structures using standard semiconductor fabrication techniques. Standard fabrication techniques are generally amenable to 2D design with extrusion of these structures into thickness (the third, vertical dimension). Moreover, the choice and availability of dielectric materials and metals that provide sufficient interaction while retaining device efficiency has proved challenging. [13,[18][19][20] Recently, effective manipulation of electromagnetic wave has been widely demonstrated with 2D metasurfaces, which were originally employed as building blocks for 3D metamaterials. In these lower-dimension designs, effective manipulation of terahertz waves for various applications is achieved by carefully designing sub-wavelength resonant structures as is evident in published review articles. [21,22] Metasurfaces present high degree of compactness that enhances radiation efficiency. Additionally, the planar form factor of metasurfaces enables Manipulation of terahertz radiation opens new opportunities that underpin application areas in communication, security, material sensing, and characterization. Metasurfaces employed for terahertz manipulation of phase, amplitude, or polarization of terahertz waves have limitations in radiation efficiency which is attributed to losses in the materials constituting the devices. Metallic resonators-based terahertz devices suffer from high ohmic losses, while dielectric substrates and spacers with high relative permittivity and loss tangent also reduce bandwidth and efficiency. To overcome these issues, a proper choice of low loss and low relative permittivi...

show abstract

Section: Fabrication Of Single and Multilayer Terahertz Metasurface Dmentioning

confidence: 99%

Section: Fabrication Of Single and Multilayer Terahertz Metasurface Dmentioning

confidence: 99%

Section: Lossless Dielectric Materialsmentioning

confidence: 99%

Section: Lossless Dielectric Materialsmentioning

confidence: 99%

Section: Lossless Dielectric Materialsmentioning

confidence: 99%

See 3 more Smart Citations

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Ako

Upadhyay

Withayachumnankul

et al. 2019

Advanced Optical Materials

105

View full text Add to dashboard Cite

show abstract

Bifunctional Perovskite‐BiVO₄ Tandem Devices for Uninterrupted Solar and Electrocatalytic Water Splitting Cycles

Pornrungroj

Andrei

Rahaman

et al. 2020

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Photoelectrochemical (PEC) fuel synthesis depends on the intermittent solar intensity of the diurnal cycle and ceases at night. Here, an integrated device that does not only possess PEC water splitting functionality, but also operates as an electrolyzer in the nocturnal period to improve the overall capacity factor is described. The bifunctional system is based on an “artificial leaf” tandem PEC architecture that contains an inverse‐structure lead halide perovskite protected by a graphite epoxy/parylene‐C coating (conferring 96 h stability of operation in water), and a porous BiVO4 semiconductor. The light‐absorbers are interfaced with a H2 evolution catalyst (Pt) and a Co‐based water oxidation catalyst, respectively, which can also be directly driven by electricity. Thus, the device can operate in PEC mode during irradiation and switch to an electricity‐powered mode in the dark through bypassing of the semiconductor configuration. The bifunctional perovskite‐BiVO4 tandem provides a solar‐to‐hydrogen efficiency of 1.3% under simulated solar irradiation and an onset for water electrolysis at 1.8 V. The compact design and low cost of the proposed device may provide an advantage over other technologies for round‐the‐clock fuel production.

show abstract

Selective Growth of Type‐II Weyl‐Semimetal and Van der Waals Stacking for Sensitive Terahertz Photodetection

He,

Yang,

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

The emergence of novel topological semimetal materials, accompanied by exotic non‐equilibrium properties, not only provides a fertile playground for a fundamental level of interest but also opens exciting opportunities for inventing new applications by making use of different light‐induced effects such as nonlinear optics, optoelectronics, especially for the highly pursued terahertz (THz) technology due to the gapless electronic structures. Exploring type‐II Weyl semimetal endowed with the richness of quantum wavefunction and peculiar band structure, underlie strong nonlinear coupling with THz waves. Here, the selective growth of type‐II Weyl semimetal NbIrTe4 by means of a self‐flux approach is reported, which hosts strongly tilted Weyl cones and exotic Fermi arcs. The oscillating THz field induced by the antenna is engineered in terms of planar metal‐topological semimetal‐metal structure, along with van der Waals stacking, which allows for self‐powered photodetection at room temperature. The results elucidate the superior performance of NbIrTe4‐graphene heterostructure‐based photodetectors with responsivity up to 264.6 V W−1 at 0.30 THz, fast response of 1 µs as well as low noise equivalent power ˂0.28 nW Hz−0.5 is achieved, already exhibiting high‐quality imaging at THz frequency. The results promise superb impacts in exploring topological Weyl semimetals for efficient low‐energy photon harvesting.

show abstract

An Ultrafast Switchable Terahertz Polarization Modulator Based on III–V Semiconductor Nanowires

Cited by 85 publications

References 65 publications

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Bifunctional Perovskite‐BiVO₄ Tandem Devices for Uninterrupted Solar and Electrocatalytic Water Splitting Cycles

Selective Growth of Type‐II Weyl‐Semimetal and Van der Waals Stacking for Sensitive Terahertz Photodetection

Contact Info

Product

Resources

About

An Ultrafast Switchable Terahertz Polarization Modulator Based on III–V Semiconductor Nanowires

Cited by 85 publications

References 65 publications

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Bifunctional Perovskite‐BiVO4 Tandem Devices for Uninterrupted Solar and Electrocatalytic Water Splitting Cycles

Selective Growth of Type‐II Weyl‐Semimetal and Van der Waals Stacking for Sensitive Terahertz Photodetection

Contact Info

Product

Resources

About

Bifunctional Perovskite‐BiVO₄ Tandem Devices for Uninterrupted Solar and Electrocatalytic Water Splitting Cycles