Linewidth narrowing and Purcell enhancement in photonic crystal cavities on an Er-doped silicon nitride platform.
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.
Gong
Yiyang
Y
1Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA. yiyangg@stanford.edu
Makarova
Maria
M
Yerci
Selçuk
S
Li
Rui
R
Stevens
Martin J
MJ
Baek
Burm
B
Nam
Sae Woo
SW
Hadfield
Robert H
RH
Dorenbos
Sander N
SN
Zwiller
Val
V
Vuckovic
Jelena
J
Dal Negro
Luca
L