Whispering Gallery Mode Lasing from Zinc Oxide Hexagonal Nanodisks

Abstract

Disk-shaped semiconductor nanostructures provide enhanced architectures for low-threshold whispering gallery mode (WGM) lasing with the potential for on-chip nanophotonic integration. Unlike cavities that lase via Fabry-Perot modes, WGM structures utilize low-loss, total internal reflection of the optical mode along the circumference of the structure, which effectively reduces the volume of gain material required for lasing. As a result, circularly resonant cavities provide much higher quality (Q) factors than lower reflection linear cavities, which makes nanodisks an ideal platform to investigate lasing nanostructures smaller than the free-space wavelength of light (i.e., subwavelength laser). Here we report the bottom-up synthesis and single-mode lasing properties of individual ZnO disks with diameters from 280 to 900 nm and show finite difference time domain (FDTD) simulations of the whispering gallery mode inside subwavelength diameter disks. These results demonstrate ultraviolet WGM lasing in chemically synthesized, isolated nanostructures with subwavelength diameters.

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

“…To solve this problem, an alternative way for single mode lasing can be employed through breaking the symmetry of cavity structure. It will result in modal gain that is selected by the asymmetrical structure of the cavity 56. Figure 6d–f demonstrates the realization of single mode lasing inside an asymmetrically shaped cavity.…”

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

“…Recently, the whispering-gallery mode (WGM) lasing with high quality factor and low lasing threshold was investigated in the ZnO hexagonal microcavities. [10][11][12][13][14][15][16][17][18][19] Most of the high quality WGM lasing results were observed from ZnO microrod/wires with several millimeters. [12][13][14][15][16] However, the traditional GaAs and GaN WGM microcavities are of disk structures formed by the etching technique.…”

Whispering gallery modes in deformed hexagonal resonators

“…1) have been investigated in various material systems such as (Al,Ga)As/ GaAs [20], GaN [21], (In,Ga)N [22], ZnO [17,23,24], In 2 O 3 [25], and organic materials [26]. Stimulated emission (lasing) has been demonstrated for triangular [15,27], hexagonal [28][29][30][31][32], and dodecagonal [33] cavities.…”