| Summary: | 博士 === 國立交通大學 === 照明與能源光電博士學位學程 === 105 === The use of small optoelectronic devices with low power consumption for the realization of high-density integrated optoelectronic integrated circuits has attracted increasing interest in recent years. Although current semiconductor device manufacturing technology enables the development of nanoscale semiconductor optoelectronics, these devices are still restricted by the optical diffraction limit and cannot be further shrunk to nanoscale. In our research, we realized a Fabry–Perot-type surface plasmon polariton (SPP) laser by placing an insulator between a ZnO nanowire and metal film, forming a semiconductor–insulator–metal (SIM) structure. Because the emitted photons have characteristics in one-to-one correspondence with those of cavity surface plasmons (SPs), these photons also show coherent signatures. Our group has successfully demonstrated a SPP nanolaser that can be operated at room temperature through coupling between ZnO excitons and SPPs. Nanolasers with an ultracompact footprint can provide high-intensity coherent light, which can be potentially applied to high-capacity signal processing, biosensing, and subwavelength imaging.
In this dissertation, we focus on the characteristics of a ZnO nanowire laser with silver- and aluminum-based thin film. In the first part, we demonstrate that the quality of the metal thin film and surface morphology increased the threshold significantly in an aluminum-based SPP nanolaser. By improving metal quality and surface roughness, we successfully enhanced the performance of the SPP nanolaser and achieved laser operation at room temperature. In the second part of this dissertation, we successfully demonstrate SPP nanolaser operation nearby the SP frequency by using a high-quality silver film with low metal loss. The characteristics of SPP nanolasers operating nearby the SP frequency are investigated in the silver-based SPP nanolaser. We then summarize the characteristics of the SPP nanolaser when it is operated at different distances from the SP frequency. In the final part of this dissertation, we show that by selecting the appropriate combination of permittivity between the metal and dielectric layers, the insulator layer of the SIM structure can be removed. The optimization of the SPP nanolaser structure can be sustained at temperatures of up to 353 K.
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