Growth rate and surfactant-assisted enhancements of rare-earth arsenide InGaAs nanocomposites for terahertz generation

Salas, Rodolfo; Guchhait, Samaresh; Sifferman, Scott D.; McNicholas, Kyle M.; Dasika, V. D.; Jung, Daehwan; Krivoy, E. M.; Lee, Minjoo Larry; Bank, Seth R.

doi:10.1063/1.4991589

Cited by 8 publications

(5 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In summary, adding plasmonic contact electrodes to the photoconductive THz antennas leads to THz devices with higher resolution and depth of penetration. [168][169][170] Such a design was first proposed by Berry and Jarrahi 167 in 2010. As illustrated in Fig.…”

Section: Novel Terahertz Photoconductive Antennas With Higher Photon mentioning

confidence: 99%

Survey of terahertz photonics and biophotonics

et al. 2020

View full text Add to dashboard Cite

We review the advances of terahertz (THz) science and technology in biophotonics, including related challenges and solutions. The main impediment to THz spectroscopy and imaging in this field is the high absorption of the THz beam in water. Hence, transmission imaging and spectroscopy of thick wet tissue using THz radiation has generally been quite difficult. However, the absorption of THz waves by water molecules is so strong that increasing the power of the THz source can lead to structural and functional changes in tissues, so solutions must go beyond a larger power output. In terms of resolution, THz imaging is superior to ultrasound but inferior to visible light microscopy. Owing to its unique material analysis capabilities, promising diagnosis applications have been demonstrated through THz imaging and spectroscopy. Unfortunately, many applications are limited by beam penetration depth and resolution. Hence, researchers from a wide variety of scientific and technical fields have been actively improving these features through the development of electronic devices and materials. In addition, groundbreaking optical architecture and materials to reduce beam absorption in the optics of a system and generate focused beams with smaller diameters have been proposed. On the software side, image processing techniques to computationally enhance the resolution and quality of THz imaging have been proposed. Data science and machine learning to automate the diagnosis of defects and diseases through processing THz images and spectroscopy data have been proposed. We have reviewed the applications of THz radiation in biophotonics and research achievements toward advancing these applications. A conclusion with a roadmap toward increasing the footprint of the THz technology in biophotonics is also proposed.

show abstract

Section: Novel Terahertz Photoconductive Antennas With Higher Photon mentioning

confidence: 99%

Survey of terahertz photonics and biophotonics

et al. 2020

View full text Add to dashboard Cite

show abstract

“…16,17 This allows for seeding on a III-V surface and lateral overgrowth over the RE-V, and shows particular promise with the use of surfactants. 18,19 The majority of current research in this area focuses on the ErAs material system where ErAs nanoparticles in a GaAs or InGaAs matrix have found use in a number of applications, such as photomixers, 20 tunnel junctions, 21 thermoelectrics, 3,22 and may be used to influence quantum dot formation. 23 Interest has also recently expanded to similar materials such as TbAs and LuAs, which may form semiconducting nanoparticles, 24 and TbAs/ErAs core-shell nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Mechanism for embedded in-plane self-assembled nanowire formation

Wilson

Kräemer

Pennachio

et al. 2020

Phys. Rev. Materials

View full text Add to dashboard Cite

We report a novel growth mechanism that produces in-plane [11 # 0] oriented ErSb nanowires formed during codeposition of Er0.3Ga0.7Sb via molecular beam epitaxy (MBE). Nanowires are characterized by in-situ scanning tunneling microscopy (STM), as well as ex-situ transmission electron microscopy (TEM) and electron channeling contrast imaging (ECCI). We show that complexes of macrosteps with step heights on the order of 7 nm form during nanowire growth. The macrosteps are shown to be part of the in-plane nanowire growth process and are directly responsible for the observed stratified distribution of in-plane nanowires. TEM indicates that initial growth results in out-of-plane nanowires transitioning to in-plane nanowires after a critical film thickness. A surface energy model is put forward that shows the critical thickness is due to minimization of the GaSb{110} surfaces formed during out-of-plane nanowire growth. Kinetics of the transition are discussed with respect to observed features in STM, along with the material parameters needed to achieve in-plane nanowire growth.

show abstract

“…Rare-earth monopnictides have attracted great attention for basic and applied sciences, displaying extreme magnetoresistance(XMR) and topologically nontrivial band structures, [1][2][3][4] with applications in terahertz detectors, 5,6 solar cells, 7 tunnel junctions, 8 and serving as epitaxial contacts to III-V semiconductors. 1,9,10 Most all rare-earth pnictides are semimetals that crystallize in the rocksalt structure, and due to the presence of partially filled f states they are antiferromagnetic at low temperatures, [11][12][13][14][15][16][17][18] except for non-magnetic La,Y and Lu pnictides, where the f shell is empty of completely full.…”

Section: Introductionmentioning

confidence: 99%

Trivial to nontrivial topology transition in rare-earth pnictides with epitaxial strain

Khalid,

Janotti

2020

Preprint

View full text Add to dashboard Cite

The combination of magneto-transport and topological properties has brought great attention to rare-earth mono-pnictides semimetals. For some of them, like LaSb, it is unclear whether they show non-trivial topology or not based on density functional theory calculations and angular resolved photoemission spectroscopy measurements. Here, we use hybrid density functional theory to demonstrate that LaSb is in fact a trivial topological semimetal, in agreement with experiments, but on the verge of a transition to a topological phase. We show that under compressive epitaxial strain, the La d band crosses the Sb p band near the X3 point in the Brillouin zone, stabilizing a topologically non-trivial phase, opening unique opportunities to probe the inter-relation between magneto-transport properties and the effects of band topology by examining epitaxially strained and unstrained thin films of the same material.

show abstract

Growth rate and surfactant-assisted enhancements of rare-earth arsenide InGaAs nanocomposites for terahertz generation

Cited by 8 publications

References 60 publications

Survey of terahertz photonics and biophotonics

Survey of terahertz photonics and biophotonics

Mechanism for embedded in-plane self-assembled nanowire formation

Trivial to nontrivial topology transition in rare-earth pnictides with epitaxial strain

Contact Info

Product

Resources

About