| Summary: | 碩士 === 國立交通大學 === 顯示科技研究所 === 99 === One-dimensional (1D) photonic crystal (PhC) nanobeam (NB) cavity not only has the ultra-small device footprint but also has the comparable high quality (Q) factor and small mode volume (V) with two-dimensional (2D) PhC cavity. Therefore, 1D PhC NB cavity is very promising in realizing the application of active nanolasers, optical sensors, and other functional devices in the condensed photonic integrate circuits.
In this thesis, we propose two 1D PhC nanocavity designs on suspended NB, the air-centered and dielectric-centered nanocavities. The optical confinement of nanocavity along the NB is provided by multi-hetero-interface with mode-gap effect. From the numerical simulation, finite element method is used for rapidly investigating mode profile and frequency and finite-difference time-domain is used for the Q and V optimization and. These two nanocavity designs are realized via nano-fabrication processes. By the near-infrared confocal micro-photoluminescence system, single mode lasing actions with low thresholds are achieved and addressed. Moreover, the good mechanical stability due to small device size makes this kind of device suitable for optical sensing. Thus, we propose the 1D PhC coupled-NB nanocavity for optical sensing via utilizing the unique mode distribution of the even mode. Optical sensing function is demonstrated via sensing water glucose water solution with different concentrations.
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