TY - JOUR

T1 - Purcell effect and beaming of emission in hybrid algaas nanowires with gaas quantum dots

AU - Reznik, Rodion R.

AU - Cirlin, George E.

AU - Kotlyar, Konstantin P.

AU - Ilkiv, Igor V.

AU - Akopian, Nika

AU - Leandro, Lorenzo

AU - Nikolaev, Valentin V.

AU - Belonovski, Alexey V.

AU - Kaliteevski, Mikhail A.

N1 - Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2021/11

Y1 - 2021/11

N2 - Control of directionality of emissions is an important task for the realization of novel nanophotonic devices based on nanowires. Most of the existing approaches providing high directionality of the light emitted from nanowires are based on the utilization of the tapered shape of nanowires, serving as nanoantenna coupling with the light waveguided in nanowire and the directional output beam. Here we report the beaming of the emitted light with wavelength near 800 nm by naturally formed core-shell AlGaAs NW with multiply GaAs quantum dots (QDs) diameter 30 nm and height 10 nm, while the diameter of NW 130 nm, what does not support efficient emission into waveguided modes, including the mode HE11 . Experimental measurements show that intensity of emission for directions in the vicinity of the axis of NW is about two orders of magnitude higher than for perpendicular directions. The developed theoretical approach allowed us to calculate the probability of spontaneous emission for various directions and into waveguided modes and showed that highly directional radiation can be provided by the intrinsic emission properties of cylindrical NW. Our results suggest that for the small diameter of NW, directional emissions are associated with an TM0 leaky mode (when electric field oriented in axial direction) and therefore manifests in an existence of axial electric dipole transitions in quantum dots.

AB - Control of directionality of emissions is an important task for the realization of novel nanophotonic devices based on nanowires. Most of the existing approaches providing high directionality of the light emitted from nanowires are based on the utilization of the tapered shape of nanowires, serving as nanoantenna coupling with the light waveguided in nanowire and the directional output beam. Here we report the beaming of the emitted light with wavelength near 800 nm by naturally formed core-shell AlGaAs NW with multiply GaAs quantum dots (QDs) diameter 30 nm and height 10 nm, while the diameter of NW 130 nm, what does not support efficient emission into waveguided modes, including the mode HE11 . Experimental measurements show that intensity of emission for directions in the vicinity of the axis of NW is about two orders of magnitude higher than for perpendicular directions. The developed theoretical approach allowed us to calculate the probability of spontaneous emission for various directions and into waveguided modes and showed that highly directional radiation can be provided by the intrinsic emission properties of cylindrical NW. Our results suggest that for the small diameter of NW, directional emissions are associated with an TM0 leaky mode (when electric field oriented in axial direction) and therefore manifests in an existence of axial electric dipole transitions in quantum dots.

KW - Directionality of emission

KW - Micro photoluminescence

KW - Molecular beam epitaxy

KW - Nanowire

KW - Purcell factor

KW - Quantum dot

KW - Waveguide modes

UR - http://www.scopus.com/inward/record.url?scp=85118125558&partnerID=8YFLogxK

U2 - 10.3390/nano11112894

DO - 10.3390/nano11112894

M3 - Article

AN - SCOPUS:85118125558

VL - 11

JO - Nanomaterials

JF - Nanomaterials

SN - 2079-4991

IS - 11

M1 - 2894

ER -