Strongly Enhanced THz Emission caused by Localized Surface Charges in Semiconducting Germanium Nanowires

Lee, Woo Jung; Won, Jin Hyoung; Bae, Jung Min; Jeong, Kwang Sik; Cho, Mann Ho; Kang, Chul; Wi, Jung‐Sub

doi:10.1038/srep01984

Cited by 34 publications

(19 citation statements)

References 37 publications

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“…Such enhancement is directly associated with the plasmonic coupling with induced THz radiation at the junction because the scattering efficiency of AuNR is stronger at parallel polarization conditions. While consistent with previous works on different systems, [34][35][36] this demonstration offers a unique capability to probe single nanoscale objects.…”

supporting

confidence: 88%

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Jnawali

Huang

et al. 2015

Applied Physics Letters

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Terahertz (THz) spectroscopy is an important tool that provides resonant access to free carrier motion, molecular rotation, lattice vibrations, excitonic, spin, and other degrees of freedom. Current methods using THz radiation suffer from limits due to diffraction or low-sensitivity, preventing application at the scale of single nanoscale objects. Here, we present coupling between plasmonic degrees of freedom in a single gold nanorod and broadband THz emission generated from a proximal LaAlO3/SrTiO3 nanostructure. A strong enhancement of THz emission is measured for incident radiation that is linearly polarized along the long axis of the nanorod. This demonstration paves the way for the investigation of near-field plasmonic coupling in a variety of molecular-scale systems.

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supporting

confidence: 88%

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Jnawali

Huang

et al. 2015

Applied Physics Letters

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“…Terahertz (THz) technologies are powerful tools for characterizing the electrodynamics of the carriers and optical properties of semiconductors and nanomaterials nondestructively [8,9]. In the case of THz emission spectroscopy, we can observe the current characteristics and charge transfer of the surface and bulk [10,11]. THz time-domain spectroscopy can be used to measure the optical transmittance, complex optical and dielectric constants, and ac conductivity of matters in the THz frequency region [8,9].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Emission and Ultrafast Carrier Dynamics of Ar-Ion Implanted Cu(In,Ga)Se2 Thin Films

Kang

Lee

et al. 2021

Crystals

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We investigated THz emission from Ar-ion-implanted Cu(In,Ga)Se2 (CIGS) films. THz radiation from the CIGS films increases as the density of implanted Ar ions increases. This is because Ar ions contribute to an increase in the surface surge current density. The effect of Ar-ion implantation on the carrier dynamics of CIGS films was also investigated using optical pump THz probe spectroscopy. The fitted results imply that implanted Ar ions increase the charge transition of intra-and carrier–carrier scattering lifetimes and decrease the bandgap transition lifetime.

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“…By this logic, we reasonably hypothesize that other improved functionalities could be also achieved through appropriate design. Although there is much recent interest in the use of 1D Ge nanostructures for many purposes, such as in lithium ion batteries, [9][10][11][12] THz, 13,14 photovoltaics, 15,16 and nanoelectomechanics, 17,18 a simple way to realize Ge nanowire-based core-shell nanostructures is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Triple phase boundary induced self-catalyzed growth of Ge–graphite core–shell nanowires: field electron emission and surface wettability

et al. 2015

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We report a simple method to fabricate Ge-graphite core-shell nanowires on a large scale using a CVD (Chemical Vapor Deposition) system free of catalyst and complicated precursors, which demonstrates interesting V-L-S (vapor-liquid-solid) boundary induced self-catalyzed growth. The novel catalystfree VLS (vapor liquid solid) mechanism is expected to be generalized for the design of other 1D (one dimensional) metal-graphite hybrids in a controlled manner, based on the fact that tunable shell thickness was achieved on Ge-graphite and a 1D Cu-graphite core-shell was realized in the same way. The Ge-graphite core-shell nanowires deliver very good field emission properties with a threshold field of about 5.33 V mm À1 and a turn-on field of 2.58 V mm À1 . The surface wetting measurement confirms the superhydrophobicity of the sample with a WCA (Water Contact Angle) of about 150.8 AE 2 , which decreased to 84.7 after 300 C (3 h) treatment under vacuum (10 À3 Torr).Moreover, the wettability behavior is robust against 365 nm UV (ultraviolet) radiation with the WCA unchanged, indicating stable superhydrophobicity in a UV-rich environment. We hope that this study contributes to the design of 1D metal-graphite nanostructures with the aim to explore more novel functionalities.

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Strongly Enhanced THz Emission caused by Localized Surface Charges in Semiconducting Germanium Nanowires

Cited by 34 publications

References 37 publications

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Photoconductive response of a single Au nanorod coupled to LaAlO3/SrTiO3 nanowires

Terahertz Emission and Ultrafast Carrier Dynamics of Ar-Ion Implanted Cu(In,Ga)Se2 Thin Films

Triple phase boundary induced self-catalyzed growth of Ge–graphite core–shell nanowires: field electron emission and surface wettability

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