Intense terahertz generation from photoconductive antennas

Isgandarov, E.; Ropagnol, X.; Singh, Mangaljit; Ozaki, T.

doi:10.1007/s12200-020-1081-4

Cited by 40 publications

(11 citation statements)

References 126 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, THz has attracted a lot of interest because its frequency application can be used in spectroscopy (Afsah-Hejri et al 2019;Spies et al 2020), communication (Yang et al 2020;Ghazialsharif et al 2023;Katyba et al 2023), imaging in medical diagnostics (Peng et al 2020;Zhang et al 2020;Wang 2021), sensing (Islam et al 2022;Lai et al 2023;Tan et al 2023), detection (Lewis 2019), etc. Terahertz radiation can be generated by a variety of techniques and processes, such as laser-plasma interaction Manendra et al 2020), electron beam-plasma interaction (Yang et al 2022;Gupta, Gurjar & Jain 2023), photoconductivity antenna (Isgandarov et al 2021;Lu et al 2022;Sandeep & Malik 2023), electron beam or laser interaction with a semiconductor or metal (Liu et al 2007;Davidson et al 2020;Dong et al 2021), nonlinear mixing of lasers (Kumar, Rajouria & KK 2013;Kumar et al 2017Kumar et al , 2023Srivastav & Panwar 2022), optical rectification (Lee et al 2000;Yeh et al 2007;Aoki, Savolainen & Havenith 2017) and second and third harmonic generation Gour et al 2022) etc. Kumar et al (2021) investigated THz radiation generation by beating of two laser pulses of finite spot size in a rippled density plasma.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Resonant excitation of terahertz surface magnetoplasmons by optical rectification over a rippled surface of n-type indium antimonide

Srivastav,

Panwar

2024

J. Plasma Phys.

View full text Add to dashboard Cite

We analysed the excitation of a surface magnetoplasmon wave by the mode conversion of a p-polarized laser beam over a rippled semiconductor (n-type)-free space interface. The pump surface magnetoplasmon wave exerts a ponderomotive force on the free electrons in the semiconductor, imparting a linear oscillatory velocity at the laser modulation frequency to them. This linear oscillatory velocity couples with the modulated electron density to produce a current density, which develops a resonant surface magnetoplasmon wave in the terahertz region. The amplitude of the terahertz surface magnetoplasmon wave can be tuneable with an external magnetic field and the semiconductor's temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

“…2022; Gupta, Gurjar & Jain 2023), photoconductivity antenna (Isgandarov et al. 2021; Lu et al. 2022; Sandeep & Malik 2023), electron beam or laser interaction with a semiconductor or metal (Liu et al.…”

Section: Introductionmentioning

confidence: 99%

Resonant excitation of terahertz surface magnetoplasmons by optical rectification over a rippled surface of n-type indium antimonide

Srivastav,

Panwar

2024

J. Plasma Phys.

View full text Add to dashboard Cite

show abstract

“…Berry et al [11] experimented with the plasmonic photoconductive emitter, demonstrating enhanced optical to THz conversion efficiency through the use of plasmonic contact electrodes that increased the number of collected photocarriers by providing nanoscale carrier transport path length for the majority of photocarrier. Isgandarov et al [12] reviewed the two types of the large-aperture photoconductive antenna (LAPCA) that could generate high-intensity THz pulses (a) those with large-aperture dipoles and (b) those with interdigitated electrodes. Jiang et al [13] conducted a detailed study on the designed GaAs dielectric metasurfaces with embedded plasmonic nanodisks and obtained the optical reflection down to 1.4% and broadened THz spectrum emitted from THz-PCA.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Radiation Generation by Laser Interaction with a Periodic Array of GaAs Structure

Sandeep

Malik

2023

Preprint

View full text Add to dashboard Cite

In the current study, a method for generating terahertz (THz) radiation using a GaAs structure array and transient current from a laser is proposed. The current generated across the length of these structures is responsible for the generation of THz radiation, where the entire system acts as phase-array dipole antennae. The maximum emitted THz power is achieved in the directions, where the conditions −bd/𝑐 𝑠𝑖𝑛𝜃𝑐𝑜𝑠𝜙=𝑝1𝜋 and −bd/𝑐 𝑠𝑖𝑛𝜃=𝑝2𝜋 are met; b and d are the widths and the length of a single GaAs structure and p1 and p2 are the integers. Where M1 and M2 are the numbers of GaAs structures along the longitudinal and transverse directions of the laser propagation, respectively, the overall antenna gain is observed to be M12 M22in these directions. The antennae approach used for the proposed GaAs periodic array enables us to obtain the THz profile in the frequency domain and realize the role of arrays and size of GaAs structure, making the emitted radiation suitable for its THz Time Domain Spectroscopic applications.

show abstract

“…Photoconductive antennas (PCAs), which consist of a gap typically several microns wide between metal contacts deposited onto a photoconductive semiconductor substrate, generate THz radiation by accelerating photo-excited carriers using an externally applied bias field. For an overview of THz PCA technology, see the comprehensive reviews by Burforda & El-Shenawee 52 and Isgandarov et al 53 The drawbacks with PCAs include: the high fabrication cost associated with microlithography, the added complexity of the requirement for an external bias voltage, and the difficulty in scaling to higher electric-field amplitudes. This difficulty arises from the limit placed on optical excitation fluences by the damage threshold of the photoconductive material.…”

Section: Introduction To Sub-picosecond Terahertz Emittersmentioning

confidence: 99%

Spintronic terahertz emitters: Status and prospects from a materials perspective

Bull

Hewett

et al. 2021

APL Materials

View full text Add to dashboard Cite

Spintronic terahertz (THz) emitters, consisting of ferromagnetic (FM)/non-magnetic (NM) thin films, have demonstrated remarkable potential for use in THz time-domain spectroscopy and its exploitation in scientific and industrial applications. Since the discovery that novel FM/NM heterostructures can be utilized as sources of THz radiation, researchers have endeavored to find the optimum combination of materials to produce idealized spintronic emitters capable of generating pulses of THz radiation over a large spectral bandwidth. In the last decade, researchers have investigated the influence of a wide range of material properties, including the choice of materials and thicknesses of the layers, the quality of the FM/NM interface, and the stack geometry upon the emission of THz radiation. It has been found that particular combinations of these properties have greatly improved the amplitude and bandwidth of the emitted THz pulse. Significantly, studying the material properties of spintronic THz emitters has increased the understanding of the spin-to-charge current conversion processes involved in the generation of THz radiation. Ultimately, this has facilitated the development of spintronic heterostructures that can emit THz radiation without the application of an external magnetic field. In this review, we present a comprehensive overview of the experimental and theoretical findings that have led to the development of spintronic THz emitters, which hold promise for use in a wide range of THz applications. We summarize the current understanding of the mechanisms that contribute to the emission of THz radiation from the spintronic heterostructures and explore how the material properties contribute to the emission process.

show abstract

Intense terahertz generation from photoconductive antennas

Cited by 40 publications

References 126 publications

Resonant excitation of terahertz surface magnetoplasmons by optical rectification over a rippled surface of n-type indium antimonide

Resonant excitation of terahertz surface magnetoplasmons by optical rectification over a rippled surface of n-type indium antimonide

Terahertz Radiation Generation by Laser Interaction with a Periodic Array of GaAs Structure

Spintronic terahertz emitters: Status and prospects from a materials perspective

Contact Info

Product

Resources

About