藍寶石基板光子晶體共振腔雷射熱特性分析

Abstract

光子晶體共振腔能將光侷限在為小體積內的能力近年來吸引科學界不少關注，光子晶體共振腔擁有高品質因子及小模態體積，因此具有相當高的潛力發展成高效能光源。然而，將光能量集中在極微小的區域內，同義於累積大量的熱能，造成溫度上升。對於未來積體光路發展，能夠連續操作的雷射光源是重要元件之一，然而伴隨而來的熱能累積及溫度驟升將使元件發光特性不穩定甚至損壞元件。為了改善光子晶體共振腔雷射的散熱能力，本文採用擁有較高熱導係數的藍寶石基板作為雷射的散熱基板，以有限元素分析法模擬此系統中熱傳導行為及平衡溫度分佈，並且以實驗驗證，相較於懸浮結構，藍寶石基板光子晶體共振腔雷射擁有較佳的熱特性。

Photonic crystal (PhC) defect cavities attracted much attention of scientist because of its ability to confine light within a tiny region even sub-wavelength scale. A PhC defect cavity which owns high quality factor and small mode volume has much potential for being a high efficient light source. However, amount of heat accumulation occur simultaneously when light is confined in a dense area. For future application, photonic integrated circuit for example, a continuous-wave (CW) operated laser source is one of significant devices, and it might be destroyed by the heat accumulation that generate during CW operation. To solve the heat accumulation problem, sapphire which has higher thermal conductivity than air is introduced to be the material of substrate. In this thesis, CW operated sapphire-bonded PhC defect lasers are introduced and characterized by simulation and experiment. By comparing with suspended PhC defect lasers, the superior thermal properties of sapphire-bonded devices are also illustrated.