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Characterizing optical resonances using spatial mode reshaping
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DOI：10.1364/OPTICA.5.001414.png)
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Abstract
En 中文
Accurately characterizing the width of a narrow (high Q) resonance can be quite challenging, requiring either a high-resolution grating spectrometer or a Fourier transform spectrometer with a long delay range. Here, we describe a new technique to determine the Q of a resonance based on spatial measurements that is not subject to the same limitations as conventional methods. We theoretically show that this technique can give an accurate measurement of Q for essentially any set of input beam parameters, even if the spectral resolution of the measurement is inadequate to resolve the linewidth of the resonance. We confirm this striking result with both numerical simulations and experimental measurements. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Keywords:
FANO RESONANCES
BOUND-STATES
LIGHT-BEAM
SHIFT
METAMATERIALS
SPECTROSCOPY
REFLECTION
CONTINUUM