| 摘要 |
<p>An infrared absorption spectrometer (10) features an optical microcavity (12), and a waveguide (18) that evanescently couples light into the microcavity (12). The optical resonance frequency of the microcavity (12) is tuned to coincide with an atomic or molecular resonance frequency of a selected atom or molecule. In this way, light coupled into the microcavity (12) will experience absorption in the presence of an atomic or molecular substance. The absorption causes a measurable change in the evanescent light coupling into the microcavity (12). The detection sensitivity of the spectrometer (10) is significantly increased, compared to prior art spectrometers, because of the high Q value of the microcavity (12) and the ensuing long optical path lengths of the resonant modes traveling within the microcavity (12).</p> |
