9 citations · 12 across the 5 of their papers we have counts for
5 papers
Inherent Negative Refraction on Acoustic Branch of Two Dimensional Phononic Crystals
Sia Nemat-Nasser
Guided by theoretical predictions, we have demonstrated experimentally the existence of negative refraction on the lowest two (acoustic) passbands (shear and longitudinal modes) of…
Growth of Shock-Induced Solitary Waves in Granular Crystals
M. Arif Hasan, Sia Nemat-Nasser
Solitary waves (SWs) are generated in monoatomic (homogeneous) lightly contacting spherical granules by an applied input force of any time-variation and intensity. We consider fini…
Unified Homogenization of Photonic/Phononic Crystals: Controllable First-band Negative Refraction
Sia Nemat-Nasser
It is shown, for the first time, that negative refraction with positive phase velocity refraction can be realized (and controlled) over a wide range of frequency on the first (lowe…
Universal Relations for Solitary Waves in Granular Crystals under Finite Rise-decay Duration Shocks
M. Arif Hasan, Sia Nemat-Nasser
We focus on solitary waves generated in arrays of lightly contacting spherical elastic granules by shock forces of steep rise and slow decay durations, and establish a priori: (i)…
Refraction Characteristics of Phononic Crystals
Sia Nemat-Nasser
The refraction properties of phononic crystals are revealed by examining the anti-plane shear waves in doubly periodic elastic composites with unit cells containing rectangular and…