Journal
OPTICS EXPRESS
Volume 18, Issue 25, Pages 26613-26624Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.026613
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Funding
- Era-NET NanoSci LECSIN project
- Italian Ministry of University and Research, FIRB [RBAP06L4S5]
- EPSRC [EP/H00680X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H00680X/1] Funding Source: researchfish
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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 similar to 10(-5)/W and similar to 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. (C) 2010 Optical Society of America
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