講演抄録/キーワード |
講演名 |
2021-11-25 13:55
Ⅲ族窒化物半導体のレーザ構造における導波路損失の測定 ○小笠原健太(金沢工大)・坂井繁太・奥村忠嗣・難波江宏一(ウシオ電機)・山口敦史(金沢工大) ED2021-21 CPM2021-55 LQE2021-33 エレソ技報アーカイブへのリンク:ED2021-21 CPM2021-55 LQE2021-33 |
抄録 |
(和) |
InGaNはInNとGaNの混晶であり,In組成を変化させることで理論上では可視光のあらゆる波長領域で発光可能な半導体材料である.その一方で,InNとGaNが強い非混和性を示すことからInGaN量子井戸は混晶組成揺らぎが大きく,状態密度が裾引き状態になることで知られる.光学利得特性はこれらの影響を強く受けるため,InGaN量子井戸レーザの正確な性能評価には導波路損失の測定が必要となる.そこで本研究では,InGaN量子井戸レーザの導波路損失を測定し,組成揺らぎが小さいと考えられるInGaP量子井戸レーザでの測定結果と比較した.その結果,InGaN量子井戸レーザはInGaP量子井戸レーザよりもストークスシフトが大きく,導波路損失が低エネルギー側に裾を引いており,InGaN量子井戸レ-ザの導波路損失が大きいことを示す結果が得られた. |
(英) |
InGaN is a semiconductor alloy material made of a mix of InN and GaN. InGaN can emit entire visible light by changing their alloy composition. On the other hand, it is well known that InGaN quantum well (QW) active layers have very large alloy compositional fluctuation and that density of states (DOS) has a tail with large localization energy due to the immiscibility of InN and GaN. Since optical gain characteristics are largely affected by these effects, it is very important to measure the waveguide loss of such fluctuated InGaN-QW. In this study, we have measured waveguide loss spectrum for an InGaN-QW laser diode (LD) structure. The loss spectrum for a conventional InGaP-QW red-light-emitting LD structure was also measured for comparison. It is observed that PL peak position difference between the surface and edge emissions is very large (~ 200 meV) in the InGaN LD sample while there is almost no difference in the InGaP LD sample. In addition, the absorption coefficient gradually rises from an energy much lower than the PL peak energy of surface emission in the InGaN LD sample while the coefficient sharply rises at nearly PL peak energy in the InGaP LD sample. These results show that the InGaN QW has a large waveguide loss. |
キーワード |
(和) |
InGaN量子井戸 / 組成揺らぎ / レーザ / 光学特性 / 導波路損失 / / / |
(英) |
InGaN-QWs / Potential fluctuation / Laser / Optical characterization / Waveguide loss / / / |
文献情報 |
信学技報, vol. 121, no. 261, LQE2021-33, pp. 33-36, 2021年11月. |
資料番号 |
LQE2021-33 |
発行日 |
2021-11-18 (ED, CPM, LQE) |
ISSN |
Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
ED2021-21 CPM2021-55 LQE2021-33 エレソ技報アーカイブへのリンク:ED2021-21 CPM2021-55 LQE2021-33 |