Galli Matteo, Gerace Dario, Welna Karl, Krauss Thomas F, O'Faolain Liam, Guizzetti Giorgio, Andreani Lucio Claudio
Dipartimento di Fisica A Volta, Universit`a degli Studi di Pavia, 27100 Pavia, Italy.
Opt Express. 2010 Dec 6;18(25):26613-24. doi: 10.1364/OE.18.026613.
We present the first demonstration of frequency conversion by simultaneous second- and third-harmonic generation in a silicon photonic crystal nanocavity using continuous-wave optical excitation. We observe a bright dual wavelength emission in the blue/green (450-525 nm) and red (675-790 nm) visible windows with pump powers as low as few microwatts in the telecom bands, with conversion efficiencies of ∼ 10 (-5) /W and ∼ 10/ W(2) for the second- and third-harmonic, respectively. Scaling behaviors as a function of pump power and cavity quality-factor are demonstrated for both second- and third order processes. Successful comparison of measured and calculated emission patterns indicates that third-harmonic is a bulk effect while second-harmonic is a surface-related effect at the sidewall holes boundaries. Our results are promising for obtaining practical low-power, continuous-wave and widely tunable multiple harmonic generation on a silicon chip.
我们展示了在硅光子晶体纳米腔中利用连续波光激发通过同时产生二次谐波和三次谐波实现频率转换的首次演示。我们观察到在电信波段中，泵浦功率低至几微瓦时，在蓝/绿（450 - 525纳米）和红（675 - 790纳米）可见光窗口出现明亮的双波长发射，二次谐波和三次谐波的转换效率分别约为10^(-5)/瓦和10^(-2)/瓦。展示了二次和三阶过程中作为泵浦功率和腔品质因数函数的缩放行为。实测和计算发射模式的成功比较表明，三次谐波是一种体效应，而二次谐波是侧壁孔边界处与表面相关的效应。我们的结果对于在硅芯片上获得实用的低功率、连续波和广泛可调谐多谐波产生很有前景。
