Anisotropic Radiation in Heterostructured “Emitter in a Cavity” Nanowire

Nanomaterials

卷:12

Valeriy M. Kondratev¹  Ivan S. Mukhin¹  Alexander A. Vorobyev¹  Alexey Kuznetsov¹  Konstantin P. Kotlyar¹  George E. Cirlin¹  Alexey D. Bolshakov¹  Rodion R. Reznik¹  Vladimir V. Fedorov¹  Prithu Roy² 

[1] Center for Nanotechnologies, Alferov University, Khlopina 8/3, 194021 Saint Petersburg, Russia;

[2] Department of Physics, ITMO University, Kronverkskii, 49, 197101 Saint Petersburg, Russia;

关键词: nanowire;    nanodisc;    GaP;    GaPAs;    infrared;    photonics;   

DOI  :  10.3390/nano12020241

来源: DOAJ

【 摘 要 】

Tailorable synthesis of axially heterostructured epitaxial nanowires (NWs) with a proper choice of materials allows for the fabrication of novel photonic devices, such as a nanoemitter in the resonant cavity. An example of the structure is a GaP nanowire with ternary GaPAs insertions in the form of nano-sized discs studied in this work. With the use of the micro-photoluminescence technique and numerical calculations, we experimentally and theoretically study photoluminescence emission in individual heterostructured NWs. Due to the high refractive index and near-zero absorption through the emission band, the photoluminescence signal tends to couple into the nanowire cavity acting as a Fabry–Perot resonator, while weak radiation propagating perpendicular to the nanowire axis is registered in the vicinity of each nano-sized disc. Thus, within the heterostructured nanowire, both amplitude and spectrally anisotropic photoluminescent signals can be achieved. Numerical modeling of the nanowire with insertions emitting in infrared demonstrates a decay in the emission directivity and simultaneous rise of the emitters coupling with an increase in the wavelength. The emergence of modulated and non-modulated radiation is discussed, and possible nanophotonic applications are considered.

【 授权许可】

Unknown