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From Membrane-in-the-Middle to Mirror-in-the-Middle with a High-Reflectivity Sub-Wavelength Grating



Corey A. Stambaugh, Haitan Xu, Utku Kemiktarak, Jacob M. Taylor, John R. Lawall


We demonstrate a ``membrane-in-the-middle'' optomechanical system using a silicon nitride membrane patterned as a subwavelength grating. The grating has a reflectivity of over 99.8%, effectively creating two sub-cavities, with free spectral ranges of 6 GHz, optically coupled via photon tunneling. Measurements of the transmission and reflection spectra show an avoided crossing where the two sub-cavities simultaneously come into resonance, with a frequency splitting of 54 MHz. We derive expressions for the lineshapes of the symmetric and antisymmetric modes at the avoided crossing, and infer the grating reflection, transmission, absorption, and scattering through comparison with the experimental data.
Annalen Der Physik


HCG, high contrast grating, sub-wavelength, membrane-in-the-middle, silicon nitride, optomechanics


Stambaugh, C. , Xu, H. , Kemiktarak, U. , Taylor, J. and Lawall, J. (2014), From Membrane-in-the-Middle to Mirror-in-the-Middle with a High-Reflectivity Sub-Wavelength Grating, Annalen Der Physik, [online], (Accessed June 15, 2024)


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Created October 2, 2014, Updated November 10, 2018