Terahertz Focusing and Polarization Control in Large-Area Bias-Free Semiconductor Emitters

Carthy, Joanna L.; Gow, Paul C.; Berry, Sam A.; Mills, B.; Apostolopoulos, Vasilis

doi:10.1007/s10762-017-0452-4

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…Hence, a nano‐torus with a major radius of

R = 150

nm is exposed to 9% of the peak amplitude of

A_{false∥} false(r, t false)

. Such a tight focusing is possible for azimuthally and radially polarized vector beams . Typical photon energies are around

ℏ ω = 2.5

meV resulting in a Rayleigh length

z_{R} = 102

nm in the GaAs host material.…”

Section: Quantitative Results Modeling and Analysismentioning

confidence: 99%

Open‐Circuit Ultrafast Generation of Nanoscopic Toroidal Moments: The Swift Phase Generator

Wätzel

Berakdar

2018

Adv Quantum Tech

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Efficient and flexible schemes for a swift, field‐free control of the phase in quantum devices have far‐reaching impact on energy‐saving operation of quantum computing, data storage, and sensoring nanodevices. A novel approach for an ultrafast generation of a field‐free vector potential that is tunable in duration, sign, and magnitude, allowing to impart non‐invasive, spatiotemporally controlled changes to the quantum nature of nanosystems is reported. The method relies on triggering a steady‐state toroidal moment in a donut‐shaped nanostructure that serves as a vector‐potential generator and quantum phase modulator. Irradiated by moderately intense, few cycle THz pulses with appropriately shaped polarization states, the nano donut is brought to a steady‐state where a nearby object does not experience electric or magnetic fields but feels the photo‐generated vector potential. Designing the time structure of the driving THz pulses allows for launching picosecond trains of vector potentials which is the key for a contact‐free optimal control of quantum coherent states. This research can trigger a new class of ultrafast quantum devices operated and switched in an energy‐efficient, contact and field‐free manner, enabling new techniques for use in quantum information, magnetic nanostructures, and superconducting tunnel junctions as well as in toroidally ordered systems and multiferroics.

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“…Hence, a nano‐torus with a major radius of

R = 150

nm is exposed to 9% of the peak amplitude of

A_{false∥} false(r, t false)

. Such a tight focusing is possible for azimuthally and radially polarized vector beams . Typical photon energies are around

ℏ ω = 2.5

meV resulting in a Rayleigh length

z_{R} = 102

nm in the GaAs host material.…”

Section: Quantitative Results Modeling and Analysismentioning

confidence: 99%

Open‐Circuit Ultrafast Generation of Nanoscopic Toroidal Moments: The Swift Phase Generator

Wätzel

Berakdar

2018

Adv Quantum Tech

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Fabrication and Characterization of an 8 × 8 Terahertz Photoconductive Antenna Array for Spatially Resolved Time Domain Spectroscopy and Imaging Applications

et al. 2021

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Terahertz (THz) technology is promising in several applications such as imaging, spectroscopy and communications. Among several methods in the generation and detection of THz waves, a THz timedomain system that is developed using photoconductive antennas (PCA) as emitter and detector presents several advantages such as simple alignment, low cost, high performance etc. In this work, we report the design, fabrication and characterization of a 2-D PCA array that is capable of detecting both the amplitude and phase of the THz pulse. The PCA array is fabricated using LT-GaAs and has 8 channels with 64 pixels (8 × 8). A novel approach using a spatial light modulator (SLM) to steer and focus the infrared probe beam towards pixels of the PCA array is presented. Each channel records the photocurrent generated by the THz signal (amplitude and phase) separately and frequencies up to 1.4 THz can be detected. Furthermore, the parameters such as directional time delay of the THz pulse, crosstalk between the channels etc., were characterized. Finally, we show that the proposed 2D PCA array design is flexible and can be used for accelerated THz spectral image acquisition.INDEX TERMS Multipixel detector, photoconductive antenna array, terahertz imaging, THz time-domain system.

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Subwavelength imaging challenges in the infrared and THz wavebands

Bergeron

Marchese

Terroux

et al. 2018

Micro- And Nanotechnology Sensors, Systems, and Applications X

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Terahertz Focusing and Polarization Control in Large-Area Bias-Free Semiconductor Emitters

Cited by 4 publications

References 39 publications

Open‐Circuit Ultrafast Generation of Nanoscopic Toroidal Moments: The Swift Phase Generator

Open‐Circuit Ultrafast Generation of Nanoscopic Toroidal Moments: The Swift Phase Generator

Fabrication and Characterization of an 8 × 8 Terahertz Photoconductive Antenna Array for Spatially Resolved Time Domain Spectroscopy and Imaging Applications

Subwavelength imaging challenges in the infrared and THz wavebands

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