Measurements of light absorption efficiency in InSb nanowires

Jurgilaitis, A.; Enquist, Henrik; Harb, Maher; Dick, Kimberly A.; Borg, Bertil; Nüske, Ralf; Wernersson, Lars‐Erik; Larsson, Jörgen

doi:10.1063/1.4833559

Cited by 4 publications

(4 citation statements)

References 25 publications

(18 reference statements)

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“…The simulation takes into account the diffraction from the nanowires with dimensions smaller than the wavelength of the exciting light. 27 More details regarding our simulations of light absorption in nanowires is given in Jurgilaitis et al 28 The laser that is incident parallel to the axial nanowire direction excites material both on the sides and the top. The electric field direction breaks the symmetry and a deeper penetration with higher excitation is obtained in the direction of the field vector.…”

mentioning

confidence: 99%

Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires

Jurgilaitis¹,

Enquist²,

Andreasson³

et al. 2014

Nano Lett.

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The modified phonon dispersion is of importance for understanding the origin of the reduced heat conductivity in nanowires. We have measured the phonon dispersion for 50 nm diameter InSb (111) nanowires using time-resolved X-ray diffraction. By comparing the sound speed of the bulk (3880 m/s) and that of a classical thin rod (3600 m/s) to our measurement (2880 m/s), we conclude that the origin of the reduced sound speed and thereby to the reduced heat conductivity is that the C44 elastic constant is reduced by 35% compared to the bulk material.

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mentioning

confidence: 99%

Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires

Jurgilaitis¹,

Enquist²,

Andreasson³

et al. 2014

Nano Lett.

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“…In order to obtain realistic and consistent parameters, we consider a particular nanostructure which is made from a nanowire containing three InAs wells (thickness 40 nm) embedded between InP barriers (thickness 3 nm). Similar structures have been recently fabricated 22 46 47 . The values of the energies E i and couplings Ω nm are estimated by a tight-binding superlattice model (see ref.…”

Section: Methodsmentioning

confidence: 63%

“…Similar structures have been recently fabricated. 22,46,47 The values of the energies E i and couplings Ω nm are estimated by a tight-binding superlattice model (see Ref. [48]), as outlined in the Appendix C. This model also provides the dipole matrix element |s 21 | = 8 nm, which points in the direction of the nanowire, and is used to estimate the Coulomb matrix elements as outlined above.…”

Section: B Parameter Valuesmentioning

confidence: 99%

Transport in serial spinful multiple-dot systems: The role of electron-electron interactions and coherences

Goldozian

Damtie

Kiršanskas

2016

Sci Rep

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Quantum dots are nanoscopic systems, where carriers are confined in all three spatial directions. Such nanoscopic systems are suitable for fundamental studies of quantum mechanics and are candidates for applications such as quantum information processing. It was also proposed that linear arrangements of quantum dots could be used as quantum cascade laser. In this work we study the impact of electron-electron interactions on transport in a spinful serial triple quantum dot system weakly coupled to two leads. We find that due to electron-electron scattering processes the transport is enabled beyond the common single-particle transmission channels. This shows that the scenario in the serial quantum dots intrinsically deviates from layered structures such as quantum cascade lasers, where the presence of well-defined single-particle resonances between neighboring levels are crucial for device operation. Additionally, we check the validity of the Pauli master equation by comparing it with the first-order von Neumann approach. Here we demonstrate that coherences are of relevance if the energy spacing of the eigenstates is smaller than the lead transition rate multiplied by ħ.

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“…Understanding the light absorption in single micro/nanostructures is essential for the optimization of device performance through architectural management. Up to now, the evaluation of light absorption of single micro/nanowires relies either on indirect measurement or theoretical models, which can only provide qualitative values 28 – 35 . Experimental methods for probing light absorption such as monitoring the photocurrent generated within single wire devices are time-consuming and require complicated microelectrodes fabrication process 36 – 41 .…”

Section: Resultsmentioning

confidence: 99%

Directly Probing Light Absorption Enhancement of Single Hierarchical Structures with Engineered Surface Roughness

Wang

Shi

Cai

et al. 2018

Sci Rep

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Hierarchical nanostructures are ideal architectures to harvest solar energy. The understanding of light absorption in single hierarchical structures is emergently important and greatly helpful in enhancing multiscale optical phenomena and light management. However, due to the geometrical complexity of hierarchical architectures, theoretical and experimental studies of light absorption have faced significant challenges. Here, we directly quantify light absorption in single hierarchical structures for the first time by utilizing VO2-based near field powermeter. It is found that light trapping is significantly enhanced in rough microwires when the roughness amplitude is comparable to the incident light wavelength. The roughness enhanced light absorption is verified as a general phenomenon on both VO2 and Si hierarchical structures. Therefore, our work not only provides a simple and quantitative method of measuring light absorption upon single geometrically complex structures in micro/nanoscale, but also contributes a general rule to rationally design of hierarchical structures for enhanced performance in photoelectric and photochemical applications.

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Measurements of light absorption efficiency in InSb nanowires

Cited by 4 publications

References 25 publications

Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires

Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires

Transport in serial spinful multiple-dot systems: The role of electron-electron interactions and coherences

Directly Probing Light Absorption Enhancement of Single Hierarchical Structures with Engineered Surface Roughness

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