Gong Yiyang, Makarova Maria, Yerci Selçuk, Li Rui, Stevens Martin J, Baek Burm, Nam Sae Woo, Hadfield Robert H, Dorenbos Sander N, Zwiller Val, Vuckovic Jelena, Dal Negro Luca
1Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.
Opt Express. 2010 Feb 1;18(3):2601-12. doi: 10.1364/OE.18.002601.
Light emission at 1.54 microm from an Er-doped amorphous silicon nitride layer coupled to photonic crystal resonators at cryogenic and room temperatures and under varying optical pump powers has been studied. The results demonstrate that small mode volume, high quality factor resonators enhance Er absorption and emission rates at the cavity resonance. Time resolved measurements give 11- to 17-fold Purcell enhancement of spontaneous emission at cryogenic temperatures, and 2.4-fold enhancement at room temperature. Resonances exhibit linewidth narrowing with pump power, signifying absorption bleaching and partial inversion of the Er ions cryogenic temperatures. We estimate that 31% of Er ions are excited at the highest pump power.
研究了在低温和室温下以及不同光泵浦功率下，与光子晶体谐振器耦合的掺铒非晶硅氮化物层在1.54微米处的发光情况。结果表明，小模式体积、高品质因数的谐振器在腔共振时增强了铒的吸收和发射速率。时间分辨测量结果显示，在低温下自发发射的珀塞尔增强因子为11至17倍，在室温下为2.4倍。谐振峰的线宽随泵浦功率变窄，这表明在低温下铒离子发生了吸收漂白和部分反转。我们估计在最高泵浦功率下31%的铒离子被激发。
