Homojen olmayan mikrorezonatörlerin optik özellikleri

It is known that the spectra of optical modes supported by microresonators are shape and size dependent. We have introduced an additional parameter, i.e., spatially varying refractive index to tailor the spectra of optical modes in microdisc resonator while keeping size and shape intact. So, a new class of whispering gallery mode (WGM) microresonators, referred to as graded index (GRIN) microresonators, is proposed. On the other hand, the WGMs in optical microresonator resemble to the confined electron states in atoms. We have studied these new proposed structures as photonic atoms. A cluster of such microresonators can be named photonic mulecule. Then, the PT-symmetry condition has been studied in microresonators. In optics, the PT-symmetry condition translated to the complex refractive index. We have studied a new type of add-drop microring resonator made of gain and loss materials as a simple implementation of PT-symmetry in microphotonics. The modal analysis of the structure is investigated numerically. It is expected that the findings of GRIN microresonator may open up new research and device opportunities in photonics.