Single-mode lasing in an AlGaInAs/InP dual-port square microresonator

Abstract

Mode selection is crucial to achieving stable single-mode lasing in microlasers. Here, we demonstrate experimentally a dual-port square microresonator for single-mode lasing with a side-mode-suppression ratio (SMSR) exceeding 40 dB. By connecting waveguides at two opposite vertices, the quality factor for the antisymmetric mode (ASM) is much higher than that of the symmetric mode (SM), enabling single-mode lasing. Furthermore, far-field interference patterns similar to Young’s two-slit interference are observed. This microlaser is capable of providing two optical sources simultaneously for optical signal processing in high-density integrated photonic circuits.

Mesotronics: Some New, Unusual Optical Effects

“…Some physical concepts presented here and in [31,32,36,37,134,135] are very general and their application can be extended in many ways: for instance, to the terahertz, in which the absorption is at least of 3-4 orders higher than in optics, surface plasmons and acoustics, in which the dielectric structure is always anisotropic due to two sound waves (transverse and shear). Mesotronic methods are even applicable to explain some of the effects of the Great Pyramid [136,137], square microresonators [138][139][140], nanopattering [141], etc. Moreover, for example, the use of "waveguide mesotronics" concept [142], based on the mesoscale particle chain with periodical focusing modes through air gaps, makes it possible to double the propagation length [143,144] of plasmon waves [145].…”

Single-mode lasing deformed square microcavity lasers

“…Single-mode operation is important for the application of WGM microlasers in monolithic integration and optical interconnection. In recent years, the square 9 and circular-side hexagonal resonator 10 for high-speed directmodulation and a two-port single-mode square microcavity 11 laser for integration circuit have been reported.…”