Research About Integrated Microdisk Laser On Chip

The 21 st century is the information age,and people's demand for information technology is also increasing day by day.The demand for high-speed and large-capacity information transmission makes optoelectronic on-chip integration a promising development prospect in the information field.There are many problems that need to be solved when the light source is built on an integrated chip,including the size of the light source,the coupling efficiency of the light source and other devices,and the characteristics of the signal generated by the device.In addition,GaN is a third-generation semiconductor material with a band gap of 3.4 e V,which is a wide band gap direct band gap semiconductor material and has the unique advantage of producing blue-violet light.The WGM laser is a laser formed by the principle of total reflection of light in the cavity.It has low threshold and high quality factor laser characteristics.It is an ideal on-chip light source and has always been a research hotspot in the field of optoelectronic devices.The content of this thesis includes fundamental theoretical research and related application research.This article first studies the influence of device size on laser characteristics,which include mode number,threshold,and quality factor.Studies have shown that the quality of lasers increases as the size of the device increases.However,due to the limitation of the micro-nano process,the increase of the device size will increase the laser loss.Therefore,it is necessary to choose a compromise between loss and laser quality improvement when considering device size.This research is of great significance for the actual selection of device size.The problem of coupling efficiency between on-chip integrated devices and devices can be solved by converging lasers in space control.A microcavity with Penrose geometry was designed,and lasing was observed under optical pumping.From simulation to seeing that its geometric structure can achieve convergent laser.In addition,we have realized single-mode lasers in the wavelength domain.A chimney-shaped microcavity is designed,single-mode lasing is observed under optical pumping,and two principles of its realization of lasing are theoretically analyzed.Finally,this article has conducted a part of tentative research on time-domain control.The aim is to use silver nanowires as a saturable absorber to achieve time-domain pulses.In this project,a circular slit-shaped suspended microcavity was prepared.By adding silver nanowires into the slit,the photoluminescence spectra of the suspended microcavity without adding silver nanowires and after adding silver nanowires were compared.By comparison,we found that in the wavelength domain,the silver nanowires suppressed the spectral mode,thus realizing quasi-single-mode lasing.