Controllable fabrication and optical properties of Sn-doped ZnO hexagonal microdisk for whispering gallery mode microlaser

Abstract

We report a controllable method for fabricating hexagonal Sn doped ZnO microdisks. The photoluminescence mechanism of the Sn doped ZnO microdisks is investigated, the defect emission is attributed to the singly charged oxygen vacancy. Under the excitation of a femtosecond pulsed laser with a wavelength of 325 nm, exciton-exciton collision process is clearly demonstrated, and amplified spontaneous emission is further realized under strong excitation. Using the perfect hexagonal symmetric structure of the Sn doped ZnO microdisks, the whispering-gallery mode lasing with high quality factor and fine mode structure is obtained from a single microdisk

Burstein-Moss Effect Behind Au Surface Plasmon Enhanced Intrinsic Emission of ZnO Microdisks

“…The XRD pattern of the ZnO microdisks in Fig. 1(d) represents the six typical diffraction peaks from (100), (002), (101), (102), (110), (103) planes which correspond to the angles of 31.7°, 34.4°, 36.2°, 47.5°, 56.5°, and 62.9° respectively, and consistent with our previous reports on ZnO microdisks1617. As indexed in the Figure, all the diffraction peaks are well matched with the wurtzite structured ZnO with lattice constants of α  = 3.250Å and c  = 5.207Å.…”

Random lasing of ZnO thin films grown by pulsed-laser deposition

“…Various types of cavities have been envisaged: individual cavities formed inside micro-or nano-single structures such as microdisks [11,16,17], microspheres [18,19], nanorods, nanowires and nanobelts [20][21][22]. In thin films, cavities are not so well identified and one should explain the effect by random lasing: multi-scattering on the edge of crystallite interfaces or grain boundaries is known to form closed-loop path [23] which could be considered as random ring cavities for light [4,13].…”

NH 4 F-assisted one-pot solution synthesis of hexagonal ZnO microdiscs for efficient ultraviolet photodetection

“…In order to obtain high-quality ZnO microdiscs, vapour phase methods, such as vapour phase transport (VPT) and chemical vapour deposition (CVD), have been widely used. The photoluminescence (PL) properties of ZnO nano-/micro-discs with whispering-gallery mode [14,15] and the growth mechanism have been studied [13,16]. However, the VPT and CVD methods need high temperature in the process, leading to high energy cost, which is not good for our environment.…”