Temperature dependent carrier dynamics in telecommunication band InAs quantum dots and dashes grown on InP substrates

Jahan, Nusrat; Hermannstädter, Claus; Huh, Jae-Hoon; Sasakura, H.; Rotter, Thomas; Ahirwar, P.; Balakrishnan, Ganesh; Akahane, Kouichi; Sasaki, Masahide; Kumano, H.; Suemune, I.

doi:10.1063/1.4775768

Cited by 37 publications

(19 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…InAs dashes on InP can emit light in the telecommunication window around 1.55 μm which, combined with unique properties of artificialatom-like structures, very high surface density, broad gain function, and nearly instantaneous gain response, all providing extraordinary spectral tunability and high-speed modulation, makes them favorable as an active medium in lasers and optical amplifiers [9][10][11][12]. The laser-related properties of the QDash ensemble have already been extensively investigated and many details have been understood and reported, as for instance the influence of the growth parameters on the nanostructure geometry, QDash ensemble homogeneity and emission energy, as well as the electronic structure [9,[13][14][15]. In addition, polarization properties of emission along with the spatial character and strength of the quantum confinement have also been studied [16,17].…”

Section: Introductionmentioning

confidence: 99%

Phonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructures

et al. 2014

View full text Add to dashboard Cite

The influence of acoustic phonons on the emission spectra of quantum dashes (QDashes), that are quasi-zerodimensional epitaxial nanostructures with significant shape anisotropy, is investigated both experimentally and theoretically. Photoluminescence (PL) spectra of single InAs/InGaAlAs/InP (001) QDashes exhibit sidebands of the main emission peak, clearly indicating the contribution of phonon-assisted emission to the exciton luminescence, which dominates the PL line shape at higher temperatures (between 50 and 100 K, usually). By utilizing the independent boson model we perform systematic and comprehensive studies of the influence of the overall geometry of quantum confinement on this spectral feature in an uncommon quantum system. A comparison of the experimental data and the results of modeling have confirmed the existence of two types of states differing in the spatial confinement and symmetry within one sample, i.e., typical for large elongated objects or characteristic for smaller and more symmetric structures. The latter are supposed to correspond to local widenings or zigzag bends present in some of the dashes and acting as additional localization centers, which confine excitons in a much smaller volume and decrease effectively the resulting in-plane anisotropy. Those observations evidence a nontrivial spatial character of the quantum confinement in these structures. They are consistent with our previous polarization-resolved study on the QDash ensemble and correlate well with the exciton decay times, and the spectral-diffusion-dominated line broadenings at low temperatures reflecting the effect of electric field fluctuations on the excitons of a different spatial extension. Finally, we demonstrate a pronounced suppression of phonon-induced decoherence for such strongly elongated nanostructures.

show abstract

Section: Introductionmentioning

confidence: 99%

Phonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructures

et al. 2014

View full text Add to dashboard Cite

show abstract

“…I 0 is the luminescence intensity in the case of 100% efficiency. Normal radiative lifetime in InAs QDs remains almost constant in the low-temperature range studied in this work, 23 and we set s À1 rad;U ¼ s À1 rad;L s À1 rad . Since electrons very close to the electron Fermi level are condensed in the SC density of states (DOS) based on the Bardeen Cooper Schrieffer (BCS) theory, 24 this assumption is rationalized in the present highly n-type doped sample.…”

Section: Methodsmentioning

confidence: 99%

Time-resolved measurements of Cooper-pair radiative recombination in InAs quantum dots

Mou

Irie

Asano

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

We studied InAs quantum dots (QDs) where electron Cooper pairs penetrate from an adjacent niobium (Nb) superconductor with the proximity effect. With time-resolved luminescence measurements at the wavelength around 1550 nm, we observed luminescence enhancement and reduction of luminescence decay time constants at temperature below the superconducting critical temperature (T C ) of Nb. On the basis of these measurements, we propose a method to determine the contribution of Cooper-pair recombination in InAs QDs. We show that the luminescence enhancement measured below T C is well explained with our theory including Cooper-pair recombination. V C 2015 AIP Publishing LLC. [http://dx

show abstract

“…Likewise, a hybrid system comprising gold-magnetite nanoparticles was used to remotely measure (GNP) and increase (CFNP) the temperature in the range of 15 to 40°C, with accuracy of 0.5°C [25]. Alternatively, it has been reported that nanosized semiconductor structures also display a monotonic redshift of the optical emission energy (E) as the temperature (T) increases [134]. This behaviour is usually described by the empirical Varshni equation [135]:…”

Section: Remote Nanoparticle-based Nanothermometersmentioning

confidence: 99%

Remote Hyperthermia, Drug Delivery and Thermometry: The Multifunctional Platform Provided by Nanoparticles

Qi¹,

Morais

2014

J Nanomed Nanotechno

View full text Add to dashboard Cite

The huge demand for biocompatible, robust, accurate and noninvasive technology to assess the temperature of a biological targeted site for monitoring the hyperthermia effect brings the topic of remote thermometry to a very high level of interest. There are already promising research directions to fulfil such demand in the short term and a review of the achievements in this issue is certainly worth. This report offers an overview of the research regarding the most promising nanothermometers nowadays, with emphasis on those addressed to remote operation while using optical or magnetic responses of nanosized materials as the thermometric property. More specifically the optical emission intensity, optical emission peak shift and optical emission lifetime will be covered as far as the optical-based nanothermometers are concerned. Additionally, for the magnetic-based nanothermometers the magnetization or the magnetic susceptibility are the thermometric properties covered in this review. Furthermore, the review includes the hyperthermia effect based on nanosized metallic or magnetic particles plus a couple of thermally-responsive polymeric drug delivery systems, aiming to provide an integrated view of the multipurpose platform offered by actuating-sensing nanoparticles. As far as the regulatory system is concerned the availability of noninvasive thermometry incorporating biocompatibility, robustness and accuracy will establish the grounds needed for the approval of the hyperthermia technology for therapeutic purposes, thus allowing the market of this technological option on a global scale.hyperthermia and thermoresponsive drug delivery systems for clinical use.Although nanothermometry is at its infancy considerable progress has been made recently in regard to its use for remote assessing the temperature at the site the nanomaterials are incorporated to. Nanoprobes allowing remote temperature-sensing using optical or magnetic properties are among the most promising directions nowadays. Most of the optical-based nanothermometers use the light-emitting intensity [15][16][17][18][19][20][21][22][23], light-emitting peak shift [24][25][26], or lifetime decay of a suitable optical band as the thermometric property [27][28][29][30]. As far as the clinical use is concerned the drawbacks of the actual optical-based nanothermometers rely on biocompatibility (usual semiconductor-based core nanoprobes or dye-based shell moieties are toxic), robustness (typical bleaching of organic-based shell moieties) or temperature accuracy (no better than 0.3°C nowadays), or even combination of these factors. Moreover, due to limitations imposed by living tissues on the optical penetration of light (optical therapeutic window in the 700-1100 nm wavelength range), noninvasive clinical use of optical excitation and signal pickup is a huge challenge, not yet solved, except for very special therapeutic applications, as for instance the photodynamic therapy for treatment (heating monitoring) of skin cancer and follow up [31]. Alternatively, ...

show abstract

Temperature dependent carrier dynamics in telecommunication band InAs quantum dots and dashes grown on InP substrates

Cited by 37 publications

References 66 publications

Phonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructures

Phonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructures

Time-resolved measurements of Cooper-pair radiative recombination in InAs quantum dots

Remote Hyperthermia, Drug Delivery and Thermometry: The Multifunctional Platform Provided by Nanoparticles

Contact Info

Product

Resources

About