Compact and Tunable Room Temperature THz Source from Quantum Dot Based Ultrafast Photoconductive Antennae

E. U. Rafailov, T. Gric, A. Gorodetsky, N. Bazieva

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Novel materials, notably quantum-dot (QD) semiconductor structures, offer the unique possibility of combining exploitable spectral broadening of both gain and absorption with ultrafast carrier dynamic properties. Thanks to these characteristics, QD-based devices have enhanced the properties of CW devices as well as the development of compact ultrashort pulse lasers and opened up new possibilities in ultrafast science and technology. In this paper we review recent progress in generation of CW and pulsed THz radiation from QD based photoconductive antennae (PCA) pumped by ultrafast and dual wavelength semiconductor lasers. By engineering the design of the QD structure, effective pump wavelengths can be tuned in the range between 0.9-1.3 μm ZKLFK LV ZHOO beyond the GaAs energies, hence compact and relatively cheap ultrafast and narrow line double-wavelength semiconductor and fibre pump lasers can be used for pumping such antennae for both pulsed and CW THz generation. However, antennae possess a low coefficient of optical-to-terahertz conversion due to the carrier screening effect and low quantum efficiency. To overcome these limitations, an optical nano-antennae technique can be employed. Such nano-antennae can be used to enhance the electric field and increase the absorption cross section in the active layers of the photoconductive antenna. We present our recent results on enhancement of THz generation in QD based log-periodic PCA with silver nano-antennae embedded in the antenna gap. Our first results demonstrated that using silver spheroid nano-antennae fabricated by a relatively simple method, can increase the coefficient of optical-to-terahertz conversion up to 4 times. In conclusion the development of an ultra-compact, efficient, room temperature THz source is possible. The inclusion of multiple bandgap-engineered semiconductor materials and quantum-confined structures enables additional pump absorption energy ranges and ultrafast charge carrier dynamics, crucial in the efficient generation of THz radiation.
Original languageEnglish
Title of host publication2019 21st International Conference on Transparent Optical Networks (ICTON)
PublisherIEEE
ISBN (Electronic)978-1-7281-2779-8
ISBN (Print)978-1-7281-2780-4
DOIs
Publication statusE-pub ahead of print - 19 Sep 2019
Event2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France
Duration: 9 Jul 201913 Jul 2019

Publication series

Name2019 21st International Conference on Transparent Optical Networks (ICTON)
PublisherIEEE
ISSN (Print)2162-7339
ISSN (Electronic)2161-2064

Conference

Conference2019 21st International Conference on Transparent Optical Networks (ICTON)
Period9/07/1913/07/19

Fingerprint

antennas
quantum dots
room temperature
pumps
silver
wavelengths
pulsed radiation
spheroids
energy absorption
coefficients
absorption cross sections
dynamic characteristics
lasers
quantum efficiency
charge carriers
pumping
screening
semiconductor lasers
engineering
inclusions

Bibliographical note

Publisher: IEEE.

Cite this

Rafailov, E. U., Gric, T., Gorodetsky, A., & Bazieva, N. (2019). Compact and Tunable Room Temperature THz Source from Quantum Dot Based Ultrafast Photoconductive Antennae. In 2019 21st International Conference on Transparent Optical Networks (ICTON) (2019 21st International Conference on Transparent Optical Networks (ICTON)). IEEE. https://doi.org/10.1109/ICTON.2019.8840510
Rafailov, E. U. ; Gric, T. ; Gorodetsky, A. ; Bazieva, N. / Compact and Tunable Room Temperature THz Source from Quantum Dot Based Ultrafast Photoconductive Antennae. 2019 21st International Conference on Transparent Optical Networks (ICTON). IEEE, 2019. (2019 21st International Conference on Transparent Optical Networks (ICTON)).
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Rafailov, EU, Gric, T, Gorodetsky, A & Bazieva, N 2019, Compact and Tunable Room Temperature THz Source from Quantum Dot Based Ultrafast Photoconductive Antennae. in 2019 21st International Conference on Transparent Optical Networks (ICTON). 2019 21st International Conference on Transparent Optical Networks (ICTON), IEEE, 2019 21st International Conference on Transparent Optical Networks (ICTON), 9/07/19. https://doi.org/10.1109/ICTON.2019.8840510

Compact and Tunable Room Temperature THz Source from Quantum Dot Based Ultrafast Photoconductive Antennae. / Rafailov, E. U.; Gric, T.; Gorodetsky, A.; Bazieva, N.

2019 21st International Conference on Transparent Optical Networks (ICTON). IEEE, 2019. (2019 21st International Conference on Transparent Optical Networks (ICTON)).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Compact and Tunable Room Temperature THz Source from Quantum Dot Based Ultrafast Photoconductive Antennae

AU - Rafailov, E. U.

AU - Gric, T.

AU - Gorodetsky, A.

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N2 - Novel materials, notably quantum-dot (QD) semiconductor structures, offer the unique possibility of combining exploitable spectral broadening of both gain and absorption with ultrafast carrier dynamic properties. Thanks to these characteristics, QD-based devices have enhanced the properties of CW devices as well as the development of compact ultrashort pulse lasers and opened up new possibilities in ultrafast science and technology. In this paper we review recent progress in generation of CW and pulsed THz radiation from QD based photoconductive antennae (PCA) pumped by ultrafast and dual wavelength semiconductor lasers. By engineering the design of the QD structure, effective pump wavelengths can be tuned in the range between 0.9-1.3 μm ZKLFK LV ZHOO beyond the GaAs energies, hence compact and relatively cheap ultrafast and narrow line double-wavelength semiconductor and fibre pump lasers can be used for pumping such antennae for both pulsed and CW THz generation. However, antennae possess a low coefficient of optical-to-terahertz conversion due to the carrier screening effect and low quantum efficiency. To overcome these limitations, an optical nano-antennae technique can be employed. Such nano-antennae can be used to enhance the electric field and increase the absorption cross section in the active layers of the photoconductive antenna. We present our recent results on enhancement of THz generation in QD based log-periodic PCA with silver nano-antennae embedded in the antenna gap. Our first results demonstrated that using silver spheroid nano-antennae fabricated by a relatively simple method, can increase the coefficient of optical-to-terahertz conversion up to 4 times. In conclusion the development of an ultra-compact, efficient, room temperature THz source is possible. The inclusion of multiple bandgap-engineered semiconductor materials and quantum-confined structures enables additional pump absorption energy ranges and ultrafast charge carrier dynamics, crucial in the efficient generation of THz radiation.

AB - Novel materials, notably quantum-dot (QD) semiconductor structures, offer the unique possibility of combining exploitable spectral broadening of both gain and absorption with ultrafast carrier dynamic properties. Thanks to these characteristics, QD-based devices have enhanced the properties of CW devices as well as the development of compact ultrashort pulse lasers and opened up new possibilities in ultrafast science and technology. In this paper we review recent progress in generation of CW and pulsed THz radiation from QD based photoconductive antennae (PCA) pumped by ultrafast and dual wavelength semiconductor lasers. By engineering the design of the QD structure, effective pump wavelengths can be tuned in the range between 0.9-1.3 μm ZKLFK LV ZHOO beyond the GaAs energies, hence compact and relatively cheap ultrafast and narrow line double-wavelength semiconductor and fibre pump lasers can be used for pumping such antennae for both pulsed and CW THz generation. However, antennae possess a low coefficient of optical-to-terahertz conversion due to the carrier screening effect and low quantum efficiency. To overcome these limitations, an optical nano-antennae technique can be employed. Such nano-antennae can be used to enhance the electric field and increase the absorption cross section in the active layers of the photoconductive antenna. We present our recent results on enhancement of THz generation in QD based log-periodic PCA with silver nano-antennae embedded in the antenna gap. Our first results demonstrated that using silver spheroid nano-antennae fabricated by a relatively simple method, can increase the coefficient of optical-to-terahertz conversion up to 4 times. In conclusion the development of an ultra-compact, efficient, room temperature THz source is possible. The inclusion of multiple bandgap-engineered semiconductor materials and quantum-confined structures enables additional pump absorption energy ranges and ultrafast charge carrier dynamics, crucial in the efficient generation of THz radiation.

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DO - 10.1109/ICTON.2019.8840510

M3 - Conference contribution

SN - 978-1-7281-2780-4

T3 - 2019 21st International Conference on Transparent Optical Networks (ICTON)

BT - 2019 21st International Conference on Transparent Optical Networks (ICTON)

PB - IEEE

ER -

Rafailov EU, Gric T, Gorodetsky A, Bazieva N. Compact and Tunable Room Temperature THz Source from Quantum Dot Based Ultrafast Photoconductive Antennae. In 2019 21st International Conference on Transparent Optical Networks (ICTON). IEEE. 2019. (2019 21st International Conference on Transparent Optical Networks (ICTON)). https://doi.org/10.1109/ICTON.2019.8840510