Low-Threshold Nanowire Laser Based on Composition-Symmetric Semiconductor Nanowires

Abstract

Low-threshold nanoscale lasers are attractive for their promising applications in highly integrated photonic devices and systems. Here we report the controllable growth of composition-symmetric CdS x Se 1−x nanowires by using a multistep thermal evaporation route with moving sources. Microstructure analyses reveal the obtained wires are highquality single crystals with the composition gradually changed from the center toward their both ends. Under laser illumination, these wires exhibit symmetrical color distribution along the length direction, with red at the center and green at the both ends. Optically pumped lasing is realized at room temperature using these composition-symmetric nanowires, with the threshold several times lower than that of compositionhomogeneous wires. This new nanowire structure will have potential applications as low-threshold nanoscale lasers in integrated nanophotonics.

Light-Emitting Devices – Luminescence from Low-Dimensional Nanostructures

“…Materials with a large surface area-tovolume ratio can be a good candidate in optoelectronics applications. Applications of devices based on optical properties can include lasers, solar cells, optical detectors and sensors, displays, photo-catalysis, imaging and phosphor devices [23][24][25][26][27][28][29][30].…”

Orientation‐Controlled 2D Anisotropic and Isotropic Photon Transport in Co‐crystal Polymorph Microplates

“…[5,7,11,12] For the active waveguides, the major loss mechanisms include the substrate coupling loss (a s ) and the re-absorption loss (a r ). [29] The former depending on the relative refractive indexes between the substrate and microplate makes no difference to the distinct transport directions. Hence, only the re-absorption loss, which is related to the relative orientation between the electric field (that is, polarization) of waveguide light and the molecular transition dipole moment (Scheme 1), could account for the anisotropic light propagation.…”

Fabrication and micro-photoluminescence property of CdSe/CdS core/shell nanowires

“…Masaru Kuno's group reported the successful fabrication of CdSe/CdS core/shell NW by using a solution-phase chemistry method [13], but the shell layer is polycrystalline and randomly attached on the core surface. In past decade, considerable progresses have been achieved in fabricating crystalline NWs heterostructures by optimizing chemical vapor deposition (CVD) method [14][15][16][17]. However, to best of knowledge, controllable assemble of crystalline CdSe/CdS core/shell NW has not been achieved so far.…”