This work deals with the development of a new class of metamaterials based on phononic composite structures that can offer vibration protection in a wide range of applications. Such phononic heterostructures is a class of phononic crystals that exhibit spectral gaps with lattice constants of a few orders of magnitude smaller than the relevant acoustic wavelength. The design of a phononic composite metamaterial is based on the formation of omnidirectional frequency gaps. This is very much relevant to the dimensionality of a finite slab of the crystal. In this respect, two dimensional structures are used to cut off acoustic waves. In this study, different infrared thermography techniques were used in order to assess the phononic structure’s geometry, as well as to determine the thermal properties of the metamaterial.
A full elastodynamic multiple scattering approach is employed to investigate the behavior of nonreciprocal phononic structures consisting of periodic helical assemblies of spheres. We report on cases of dense and sparse helical chains, cases with size variation and low frequency behavior.
A full electrodynamic and elastodynamic multiple scattering approach is employed to describe the optical and
acoustic modes, and to account for their mutual interaction both in time and frequency domain in one-dimensional
phoXonic crystal slabs. We report on the occurrence of nonlinear acousto-optic interactions and demonstrate
the effect of the hypersonic tuning of photonic Dirac points in the optical and telecom frequencies. Potential
sensing capabilities are examined under moderate acousto-optic interactions in the proximity of crossing photonic
bands enabling light to slow down, stop or reverse. Quarter-wave stack arrangements are considered in the
optical (polymeric-based slab) and IR (Si-based slab) frequencies. Such structures support two bands that cross
symmetrically, without forming a photonic gap. In the vicinity of the Dirac point (crossing bands), dynamic
tuning achieves efficient transfer of energy between the bands using weak and slow modulations of the wave
velocity. Finally, through hypersonic light modulation, we may achieve efficient electromagnetic pulse reversal
Periodic media offer impressive opportunities to manipulate the transport of classical waves namely light or sound.
Elastic waves can scatter light through the so-called acousto-optic interaction which is widely used to control
light in telecommunication systems and, additionally, the radiation pressure of light can generate elastic waves.
Concurrent control of both light and sound through simultaneous photonic-phononic, often called phoxonic, bandgap
structures is intended to advance both our understanding as well as our ability to manipulate light with
sound and vise versa. In particular co-localization of light and sound in phoxonic cavities could trigger nonlinear
absorption and emission processes and lead to enhanced acousto-optic effects. In the present communication,
we present our efforts towards the design of different phoxonic crystal architectures such as three-dimensional
metallodielectric structures, two-dimensional patterned silicon slabs and simple one-dimensional multilayers,
and provide optimum parameters for operation at telecom light and GHz sound. These structures can be used
to design phoxonic cavities and study the acousto-optic interaction of localized light and sound, or phoxonic
waveguides for tailored slow light-slow sound transport. We also discuss the acousto-optic interaction in onedimensional
multilayer structures and study the enhanced modulation of light by acoustic waves in a phoxonic
cavity, where a consistent interpretation of the physics of the interaction can be deduced from the time evolution
of the scattered optical field, under the influence of an acoustic wave.
Conference Committee Involvement (4)
Smart Sensor Phenomena, Technology, Networks, and Systems Integration VIII
9 March 2015 | San Diego, California, United States
Smart Sensor Phenomena, Technology, Networks, and Systems Integration VII
10 March 2014 | San Diego, California, United States
Smart Sensor Phenomena, Technology, Networks, and Systems Integration VI
10 March 2013 | San Diego, California, United States
Smart Sensor Phenomena, Technology, Networks, and Systems Integration V
12 March 2012 | San Diego, California, United States