Analysis of the experimental Q factors (∼ 1 million) of photonic crystal nanocavities

Optics Express

Volumn 14, Issue 5, 2006, Pages 1996-2002

  Asano, Takashi ^a   Song, Bong Shik ^a   Noda, Susumu ^a  

^a KYOTO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTALLINE MATERIALS; LIGHT ABSORPTION; NANOSTRUCTURED MATERIALS;

PHOTONIC CRYSTALS; Q FACTOR;

OPTICAL FIBERS;

EID: 33644752817     PISSN: 10944087     EISSN: 10944087     Source Type: Journal    
DOI: 10.1364/OE.14.001996     Document Type: Article

References (14)

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7. We believe that it is necessary to reveal the measurement method in detail since the FWHM of the spectrum is of the order of picometers, almost at the limit of resolution. An external cavity, tunable wavelength, semiconductor laser was used (SANTEC, TSL-210). The emission wavelength was changed by controlling the cavity length with a piezo actuator. The width of the laser line was < 1MHz (∼ 8 fm at 1570 nm). Each time the emission wavelength was altered, it was measured using a wavelength meter (Agilent 86122-A-opt-002: with high precision option). The differential accuracy of the wavelength meter was ± 0.15 pm. The best Lorentzian fit to the resonant spectrum had a FWHM value of 1.95 pm. We evaluated the range of FWHM value as 1.8-2.1 pm by adding an error value of ± 0.15 pm to the best fit value. (In addition to the accuracy of the measurement system, there is a problem of temperature fluctuation since temperature dependence of the cavity resonant wavelength is as large as 80 pm/K [14]. This might widen the evaluation range of FWHM further, namely, the FWHM value might be smaller than 1.8pm or larger than 2.1pm.)
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