Microcavities with suspended subwavelength structured mirrors
arXiv:1804.00909 · doi:10.1364/OE.26.029886
Abstract
We investigate the optical properties of microcavities with suspended subwavelength structured mirrors, such as high-contrast gratings or two-dimensional photonic crystals slabs, and focus in particular on the regime in which the microcavity free-spectral range is larger than the width of a Fano resonance of the highly reflecting structured mirror. In this unusual regime, the transmission spectrum of the microcavity essentially consists in a single mode, whose linewidth can be significantly narrower than both the Fano resonance linewidth and the linewidth of an equally short cavity without structured mirror. This generic interference effect---occuring in any Fabry-Perot resonator with a strongly wavelength-dependent mirror---can be exploited for realizing small modevolume and high quality factor microcavities and, if high mechanical quality suspended structured thin films are used, for optomechanics and optical sensing applications.
4 pages, 5 figures
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- Membrane sandwich squeeze film pressure sensors
- Suspended silicon nitride thin films with enhanced and electrically tunable reflectivity
- Profilometry and stress analysis of suspended nanostructured thin films
- Quasibound states in the continuum in photonic-crystal-based optomechanical microcavities
- Stress-controlled frequency tuning and parametric amplification of the vibrations of coupled nanomembranes
- Narrow-linewidth Fano microcavities with resonant subwavelength grating mirror
- Mechanical investigations of free-standing SiN membranes patterned with one-dimensional photonic crystal structures
- Dissipative and dispersive cavity optomechanics with a frequency-dependent mirror
- Polarization-independent optical spatial differentiation with a doubly-resonant one-dimensional guided-mode grating
- Highly reflective and high- thin resonant subwavelength gratings
- Collimation and finite-size effects in suspended resonant guided-mode gratings
- Optical microcavity with a pair of suspended resonant mirrors