Journal
OPTICS EXPRESS
Volume 22, Issue 1, Pages 916-924Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.000916
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Funding
- JSPS KAKENHI [20226002, 23686015]
- MEXT KAKENHI [23104721]
- Future Pioneering Projects
- CPHoST program
- Grants-in-Aid for Scientific Research [20226002, 23686015] Funding Source: KAKEN
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We have investigated absorption losses due to surface water adsorbed on the surface of silicon heterostructure nanocavities with quality (Q) factors of several million. Measurements performed while changing the ambient humidity that the nanocavity is exposed to show that the Q value depends linearly on humidity. We also reveal that chemical treatment to change the degree of hydrophilicity of the surface results in a drastic increase of Q; we have obtained an experimental value of 9 million, which represents a new record for a heterostructure nanocavity. We analytically determine the absolute value of absorption loss by exploiting the degree of fluctuation of Q values between different samples. (C) 2014 Optical Society of America
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