NOVEL MICROLASER BY QUANTUM INSPIRED ENGINEERING
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Optics and Photonics is an exciting area of study that involves the cross-section of physics, material science, and electrical engineering. With the academic development of Parity-Time (PT) symmetry and Exceptional Point (EP), we can engineer unique and novel InGaAsP/InP or hybrid Si/InGaAsP microlaser platforms to implement certain interesting properties from these complex architectures, such as the elimination of spatial hole burning (SHB) effect in conventional microring laser, the generation of lasing beam carrying orbital angular momentum (OAM) information, and robust single mode lasing in the desired state, even with intentionally introduced perturbations.In conventional microring lasers, multi-modes oscillates inside the cavity. By tailoring the spatial refractive index distribution to eliminate mode competitions and instabilities caused by the spatial hole burning effect, unidirectional power flow and single mode lasing can be achieved through our complex optics applications. Furthermore, by intentionally extracting the phase of this single mode, twisted lasing radiation that carries orbital angular momentum information, can be realized. Extending the case to the microlaser array of 1D Su-Schrieffer-Heeger(SSH) model, the robust single mode is pinned at zero energy due to charge-conjugation symmetry, even with intentionally introduced perturbations. Optical setups with Monochromator and Lock-in Amplifiers are used to gather emission evolution from photoluminescence to amplified spontaneous emission and finally, to lasing. Further characterizations, such as polarization, OAM charge, and robust lasing with perturbation, are also done to prove the theoretical prediction. Our microlasers are thus expected to provide integrated optoelectronic platform for optical communications applications.In this dissertation, we describe all these projects in detail.