Giant enhancement of terahertz emission from nanoporous GaP

Atrashchenko, A.; Arlauskas, Andrius; Adomavičius, R.; Korotchenkov, A. V.; Ulin, V. P.; Belov, Pavel A.; Krotkus, A.; Evtikhiev, V. P.

doi:10.1063/1.4901903

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…Apart from these well‐established methods, novel approaches of nanophotonics to THz generation that employ an artificial electromagnetic medium ( metamaterials and metasurfaces ) , and new types of materials (graphene , carbon nanotubes , and three‐dimensional topological insulators such as Bi 2 Se 3 ) have been recently proposed.…”

Section: Principles Of Thz Photoconductive Antennas and Photomixersmentioning

confidence: 99%

“…Another possible way to generate THz -optical rectification -works when media obtains nonlinear polarisation under intense optical radiation, and results in polarisation repeating the shape of the optical pulse envelope [58][59][60]. Moreover, apart from these well-established methods, novel approaches of photonics to THz generation that employ artificial electromagnetic medium (metamaterials and metasurfaces) have been recently proposed [61][62][63][64][65][66][67][68][69]. Nowadays, the most common method of low power THz generation involves the use of semiconductor structures surface conductivity [70,71].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of terahertz photoconductive antenna operation by optical nanoantennas

Lepeshov

Gorodetsky

Krasnok

et al. 2016

Laser & Photonics Reviews

143

121

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Photoconductive antennas are promising sources of terahertz radiation that is widely used for spectroscopy, characterization, and imaging of biological objects, deep space studies, scanning of surfaces, and detection of potentially hazardous substances. These antennas are compact and allow for generation of both ultrabroadband pulses and tunable continuous wave terahertz signals at room temperatures, with no need for high‐power optical sources. However, such antennas have relatively low energy conversion efficiency of femtosecond laser pulses or two close pump wavelengths (photomixers) into the pulsed and continuous terahertz radiation, correspondingly. Recently, an approach to solving this problem that involves known methods of nanophotonics applied to terahertz photoconductive antennas and photomixers has been proposed. This approach comprises the use of optical nanoantennas for enhancing the absorption of pump laser radiation in the antenna gap, reducing the lifetime of photoexcited carriers, and improving the antenna thermal efficiency. This Review is intended to systematize the main results obtained by researchers in this promising field of hybrid optical‐to‐terahertz photoconductive antennas and photomixers. We summarize the main results on hybrid THz antennas, compare the approaches to their implementation, and offer further perspectives of their development including an application of all‐dielectric nanoantennas instead of plasmonic ones.

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Section: Principles Of Thz Photoconductive Antennas and Photomixersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of terahertz photoconductive antenna operation by optical nanoantennas

Lepeshov

Gorodetsky

Krasnok

et al. 2016

Laser & Photonics Reviews

143

121

View full text Add to dashboard Cite

show abstract

“…[ 4 − 6 ] Moreover, the semiconductor surface was engineered to augment THz emission through methods, such as surface passivation and the utilization of porous materials. [ 7 − 10 ] In recent years, there has been notable research on utilizing metasurfaces to enhance the radiation capabilities of PCA, for their potential in THz surface emission. Numerous studies have reported successful generation of THz radiation using nanostructures on various semiconductor materials.…”

Section: Introductionmentioning

confidence: 99%

Semiconductor THz Emitting Nanometasurface (STEN)

Wang,

Gu,

et al. 2023

Advanced Optical Materials

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The direct bandgap semiconductor serves as a fundamental terahertz (THz) source, generating terahertz waves through ultrafast femtosecond light excitation. While the direct bandgap semiconductor THz source does not rely on an external bias voltage, its limited radiation power poses a challenge to its implementation in compact THz systems. Here, nanometasurfaces etched on a semi‐insulating gallium arsenide (GaAs) substrate for enhanced THz emission are reported. The proposed semiconductor terahertz emitting nanometasurface (STEN) device based on GaAs direct bandgap semiconductor shows a 35‐fold increase in THz power and enables precise control of the emitted bandwidth. Giant emission is attributed to the enhanced absorption of pump light by the GaAs nano‐pillar array and the localized effect of the pump field. Experimental results confirm the effectiveness of the structures, demonstrating a negative correlation between the radiation power enhancement factor and pump power, indicating suitability for low‐power sources. This design offers broad prospects for semiconductor THz emitting nanometasurfaces, ideal for integration with compact femtosecond lasers.

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Nanomaterials Properties

Simmonds

2016

Handbook of Measurement in Science and Engineering

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Giant enhancement of terahertz emission from nanoporous GaP

Cited by 6 publications

References 24 publications

Enhancement of terahertz photoconductive antenna operation by optical nanoantennas

Enhancement of terahertz photoconductive antenna operation by optical nanoantennas

Semiconductor THz Emitting Nanometasurface (STEN)

Nanomaterials Properties

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