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|Title:||Dispersion and origin of surface optical-like waves in a two-dimensional antidot-patterned structure with a soft intervening layer|
|Citation:||Hou, C.G., Zhang, V.L., Ng, S.C., Kuok, M.H., Lim, H.S., Liu, X.M., Adeyeye, A.O. (2014). Dispersion and origin of surface optical-like waves in a two-dimensional antidot-patterned structure with a soft intervening layer. Applied Physics Letters 104 (9) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.4868020|
|Abstract:||The phonon dispersion of a square-lattice antidot-patterned Ni 80Fe20 film on a bottom-anti-reflective coating (BARC)/Si substrate has been investigated by Brillouin spectroscopy and finite element simulations. Band structures, measured along Γ-M and Γ-X, exhibit Bragg gap openings, surface optical-like and acoustic-like waves, and an acoustically isolating feature arising from the soft BARC layer. A qualitative explanation of the origin of the optical-like waves is presented, by mapping their displacement fields onto reciprocal space. Interestingly, these waves can be frequency shifted, almost independently of the acoustic-like mode frequencies, by varying one of the dimensions of the patterned array on the Ni80Fe20 film. © 2014 AIP Publishing LLC.|
|Source Title:||Applied Physics Letters|
|Appears in Collections:||Staff Publications|
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