Phononics 2011: International Conference on Phononic Crystals, Metamaterials and Optomechanics
	May 29-June 2 2011, Santa Fe, New Mexico, USA
		(Please use the tabs at the bottom for navigation)
		Tuesday: May 30	Detailed Program Information
		Registration (Promenade)	7:30 am - 12:00 pm
		Announcements (Mesa BR)	8:15 am - 8:30 am
		Track 3: Periodic Structures
		Session: 6 (Mesa Ballroom)	8:30 am - 10:20 am
		Session Chair:  A. Norris
		Author: P. Deymier	Category: Plenary Talk
		Paper #: 0073	Time: 8:30 am -9:00 am
		Title: Phononic crystals with complete phase space properties
		Abstract: We review and demonstrate properties of phononic crystals over their complete phase space, namely, spectral (ω-space), wave vector (k-space) and phase (φ-space) properties. The later two properties are applied to acoustic imaging with a phononic crystal flat lens and to inter-ference-driven acoustic Boolean logic.
		Author: G.M. Hulbert	Category: Plenary Talk
		Paper #: 0137	Time: 9:00 am -9:30 am
		Title: Structurally-Inspired Phononic Metamaterials
		Abstract: The distinction between materials and structures has blurred. The development of phononic metamaterials based upon novel structural systems is considered in this work. In particular, a Negative-Poisson Ratio (NPR) structure is used as the foundation for developing phononic metamaterials comprising a ‘structural’ framework of stiff material and a more compliant material that can dissipate energy.
		Author: J. S. Jensen	Category: Keynote Talk
		Paper #: 0055	Time: 9:30 am -9:55 am
		Title: Optimal Design of Nonlinear Wave Devices
		Abstract: The method of topology optimization is applied to wave propagation problems with nonlinearities. In the general case the iterative design procedure should be based on transient simulation of the wave propagation, but in the special case of non-instantaneous nonlinearities a steady-state optimization formulation can be applied. The latter case is exemplified by the design of a 1D optical diode.
		Author: J. Wen	Category: Keynote Talk
		Paper #: 0117	Time: 9:55 am -10:20 am
		Title: Phononic Crystals with Applications to Sound and Vibration Control
		Abstract: A two dimensional binary locally resonant phononic crystal (PCs) has been fabricated and thoroughly analyzed. A lumped-mass method has been proposed as an efficient tool to calculate the band structure of PCs. The concept of PCs is introduced into the design of beam and plate structures, and the acoustic materials to improve their vibration and sound performance.
		Coffee Break (Promenade)	10:20 am - 10:45 am
		Track 3: Periodic Structures
		Session: 7 (Mesa Ballroom)	10:45 am - 12:25 pm
		Session Chair:  G. Hulbert
		Author: M.J. Leamy	Category: Keynote Talk
		Paper #: 0071	Time: 10:45 am -11:10 am
		Title: New Directions in the Analysis of Nano-Scale Phononic and Nonlinear Metamaterial Systems
		Abstract: This talk will focus on two directions being pursued by the author and his coworkers in the areas of (i) multi-scale modeling of phonon spectra and dispersion in reduced dimensional nano-scale systems (e.g., carbon nanotubes), and (ii) analysis of phononic wave propagation in nonlinear metamaterials using asymptotic techniques.
		Author: A. S. Phani	Category: Keynote Talk
		Paper #: 0107	Time: 11:10 am -11:35 am
		Title: Lattice Materials: A Unified Structural Mechanics Perspective
		Abstract: Lattice materials with a periodic microstructure are suitable for multifunctional structures with high specific stiffness, favourable acoustic and thermal properties. Their mechanical response under static and dynamic loads is considered from a unified structural mechanics perspective combining Bloch wave theory with Finite Element Method.
		Author: V. Romero-Garcia	Category: Keynote Talk
		Paper #: 0101	Time: 11:35 am -12:00 pm
		Title: Theoretical and Experimental Evidence of Evanescent Modes in Finite Sonic Crystals
		Abstract: Evanescent modes in complete sonic crystals (SC) and SC with point defects are both theoretically and experimentally reported in this paper. Finite element method and an extension of the plane wave expansion with supercell approximation to solve the invers problem k(ω) is used to predict the evanescent modes. Experimental data and numerical results are in good agreement with the predictions.
		Author: C. Daraio	Category: Org. Colloquium
		Paper #: 0155	Time: 12:00 pm -12:25 pm
		Title: From Newton's Cradle to New Acoustic Crystals
		Abstract: The bouncing beads of Newton's cradle fascinate children and executives alike, but their symmetric dance hides a complex dynamic behavior. By assembling grains in crystals we are developing new materials and devices with unique properties. We have constructed twodimensional systems that can redirect mechanical waves, and have developed new materials for absorbing vibrations and explosive blasts.
		Lunch Break (Chamisa)	12:25 pm - 2:00 pm
		Track 4: Phonon Transport
		Session: 8 (Mesa Ballroom)	2:00 pm - 5:05 pm
		Session Chair:  P. Deymier
		Author: Baowen Li	Category: Plenary Talk
		Paper #: 0042	Time: 2:00 pm -2:30 pm
		Title: Phononics: a new science and technology in processing information and controlling heat flow by phonons
		Abstract: Heat due to lattice vibration is usually regarded as harmful for information processing. However, studies in recent years have changed this mindset. I will demonstrate via numerical simulation, theoretical analysis and experiments that, phonons, can be manipulated like electrons. They can be used to carry and process information. Basic phononic devices such as thermal diode, thermal transistor, thermal logic gate and thermal memory can be worked via nonlinear lattice and/or low dimensional nanostructures such as nanowire, nanotube, graphen nanoribbon etc. .
		Author: A. Balandin	Category: Plenary Talk
		Paper #: 0133	Time: 2:30 pm -3:00 pm
		Title: Nanoscale Phonon Engineering: From Quantum Dots and Nanowires to Graphene and Topological Insulators
		Abstract: I describe the nanoscale phonon engineering concept and its possible applications. Nanostructures offer new ways for controlling phonon transport via tuning phonon dispersion. Engineering the phonon spectrum can become as powerful a technique as the electron bandgap engineering, which revolutionized electronics. I outline recent examples of phonon engineering in quantum dot superlattices, nanowires, graphene ribbons and topological insulators. Particular attention is given to the phonon thermal transport in graphene and graphene's applications in thermal management.
		Author: A. J. H. McGaughey	Category: Keynote Talk
		Paper #: 0047	Time: 3:00 pm -3:25 pm
		Title: Predicting Phonon Properties Using the Spectral Energy Density
		Abstract: The spectral energy density technique for predicting phonon dispersion relations and relaxation times is presented. This technique, which uses atomic velocities obtained from a molecular dynamics simulation, incorporates the full anharmonicity of the atomic interactions. Results for a Lennard-Jones face centered cubic crystal are provided.
		Author: K. P. Pipe	Category: Keynote Talk
		Paper #: 0108	Time: 3:25 pm -3:50 pm
		Title: Effect of Interface Roughness on Phonon Transport in Superlattices
		Abstract:  We present a boundary perturbation method to analyze phonon reflection, transmission, and mode conversion at a rough interface, and extend these calculations using a transfer matrix approach to examine the effects of interface roughness on phonon transport in multilayer thin films.
		Author: P. E. Hopkins	Category: Keynote Talk
		Paper #: 0080	Time: 3:50 pm -4:15 pm
		Title: Phonon scattering at structurally variant boundaries
		Abstract: Phonon scattering at boundaries drives the thermal transport in nanosystems. In this work, I will discuss various projects in which solid boundaries and interfaces are used to reduce the thermal conductance in nanosystems. These studies include cross plane thermal conductivity in periodic, porous silicon films and thermal boundary conductance across ran-dom and quantum dot roughened Si interfaces.
		Author: I. Maasilta	Category: Keynote Talk
		Paper #: 051	Time: 4:15 pm -4:40 pm
		Title: Phononic Thermal Transport in Thin Nanoscale Membranes
		Abstract: We have studied experimentally the thermal conductance of thin free-standing sili-con nitride membranes at sub-Kelvin temperatures as a function of membrane thickness be-tween 40 nm and 750 nm, using normal metal-insulator-superconductor (NIS) thermometry. Effects of dimensionality cross-over from 3D to 2D phonons are seen, however not all obser-vations follow the simplest theory.
		Author: I. El-Kady	Category: Org. Colloquium
		Paper #: 0183	Time: 4:40 pm -5:05 pm
		Title: Thermal Conductivity Reduction in Phononic Crystals: Interplay of Coherent versus Incoherent Scattering
		Abstract: In this talk we pose the question: Can the coherent scattering events brought by the periodicity of the Phononic Crystal (PnC) lattice affect the high frequency THz phonons that dominate heat transfer process? In other words, can PnC patterning be used to manipulate the thermal conductivity of a material? We report both theoretically and experimentally on the role of coherent versus incoherent scattering of phonons by a 2D PnC structure and the efficacy of each process in both the cross plane and in plane directions of the PnC lattice.
		Coffee Break (Promenade)	5:05 pm - 5:30 pm
		Parallel Sessions
		Track 3: Periodic Structures
		Session: 9 (Mesa Ballroom A)	5:30 pm - 7:10 pm
		Session Chair:  C. Daraio
		Author: M. M. Neves	Category: Invited Oral
		Paper #: 0121	Time: 5:30 pm -5:50 pm
		Title: Using classical FEM to predict the dynamical response of periodic devices in acoustic and vibration applications
		Abstract: The task of predicting the dynamical response and tailoring wave propagation filters for practical frequency ranges is here presented. Finite element steady-state analysis is performed on periodic devices of finite length considering periodic distribution of materials, addition of masses to a tube and periodic curvatures. Validation obtained with prototypes, one for attenuation of axial vibration and other for sound propagation, is also mentioned.
		Author: O. Umnova	Category: Invited Oral
		Paper #: 0076	Time: 5:50 pm -6:10 pm
		Title: An Effective Medium Model for Sonic Crystals with Composite Resonant Elements
		Abstract: Using a self-consistent method, analytical expressions are derived for the parameters of an effective medium of composite scattering elements in air. The scatterers consist of concentrically arranged thin elastic shells and 4-slit cylinders. Predictions and data confirm that the use of coupled resonators results in a substantial insertion loss peak related to the modified resonance of the shell.
		Author: N. Swinteck	Category: Contrib. Oral
		Paper #: 0069	Time: 6:10 pm -6:25 pm
		Title: Phase-controlling properties in phononic crystals
		Abstract: We deliver a complete phase-space analysis of two well-studied PC systems to reveal the mechanisms behind phase-manipulation of propagating elastic waves in these composite structures. A triangular-array of steel cylinders embedded in a host matrix of methanol and a square-array of Polyvinylchloride cylinders embedded in a host matrix of air show band structures and equi-frequency contours (EFCs) with very different features, yet phase-control is possible in both systems. We find that phase-control depends on (1) whether or not the wave and group velocity vectors in the PC are collinear and (2) whether or not the excited Bloch waves in the PC have the same phase velocity. The results gathered in this study can be used to draw general conclusions about the reality of phase-control in many other types of PCs.
		Author: V. Tournat	Category: Contrib. Oral
		Paper #: 0009	Time: 6:25 pm -6:40 pm
		Title: Elastic waves in a three-dimensional hexagonal close-packed granular crystal: observation of rotational modes and nonlinear effects
		Abstract: Noncohesive granular phononic crystals show peculiar features related to the elastic nonlinearities at the contacts and the rotational degrees of freedom of the grains. Evidence of rotational mode propagation and non reciprocity for nonlinear acoustic effects is found in a hexagonal close-packed crystal layer with a gravityinduced elasticity gradient.
		Author: H. Estrada	Category: Contrib. Oral
		Paper #: 0041	Time: 6:40 pm -6:55 pm
		Title: The Role of Array Symmetry in the Transmission of Ultrasound through Periodically Perforated Plates
		Abstract: We present angle-resolved experimental results on the role of array symmetry in the transmission features of periodically perforated plates. A very rich interplay between Fabry-Perot single-hole resonances, coherent scattering and plate vibration is found. By comparing several spatial hole arrangements, the effects of the geometry are disentangled from the contribution of plate vibrations.B.
		Author: M. Zubtsov	Category: Contrib. Oral
		Paper #: 0057	Time: 6:55 pm -7:10 pm
		Title: EFIT Simulation of Ultrasonic Wave Propagation in Complex Microfluidic Structures
		Abstract: The Elastodynamic Finite Integration Technique (EFIT) is used to simulate ultrasonic wave propagation in complex microfluidic structures comprising fluidic channels, phononic crystal structures and piezoelectric transducers. An EFIT computational math is combined with MATLAB coding. The viability of the approach is demonstrated.
		Track 4: Phonon Transport
		Session: 10 (Mesa Ballroom C)	5:30 pm - 7:10 pm
		Session Chair:  B. Li
		Author: M. Maldovan	Category: Invited Oral
		Paper #: 0156	Time: 5:30 pm -5:50 pm
		Title: Understanding and Controlling High-Frequency Phonon Thermal Energy Transport in Nanostructures
		Abstract: We present a novel theoretical approach based on the kinetic theory of transport processes to understand and accurately describe the transport of high-frequency phonon thermal energy in nanostructures over a broad range of temperatures and across multiple length scales, i.e. from nano to micro. Good agreement with experiments is obtained.
		Author: H. Elsayed-Ali	Category: Invited Oral
		Paper #: 0078	Time: 5:50 pm -6:10 pm
		Title: Coherent phonons in polycrystalline bismuth film monitored by ultrafast electron diffraction
		Abstract: The generation of coherent phonons in polycrystalline bismuth film is observed by ultrafast time-resolved electron diffraction. The dynamics of the diffracted intensities from the (110), (202), and (024) lattice planes show pronounced oscillations at 130-150 GHz. The anisotropy in the energy transfer rate of coherent optical phonons is discussed.
		Author: K. Muralidharan	Category: Contrib. Oral
		Paper #: 0104	Time: 6:10 pm -6:25 pm
		Title: Nanostructured two-dimensional phononic materials
		Abstract: Phononic properties of nanostructured two-dimensional materials such as graphene and boron nitride (BN) sheets are calculated using the method of molecular dynamics. Nanophononic crystals composed of periodic array of holes in graphene exhibit Bragg scattering at non-cryogenic temperatures leading to reduction in thermal conductivity. The transport of phonons across non-periodic arrays of asymmetric holes in BN sheets is discussed in the context of scattering and non-linear effects that may lead to thermal rectification.
		Author: B. L. Davis	Category: Contrib. Oral
		Paper #: 0174	Time: 6:25 pm -6:40 pm
		Title: Reduction of Thermal Conductivity in Silicon Slabs by Unit Cell Nanostructuring
		Abstract: Just like unit cell structuring has seen much interest in phononic crystals for the control of sound and vibration, the same can be done at the nanoscale for the control of thermal properties. Here we present ideas for unit cell nanostructuring within thin silicon slabs for the purpose of reducing the thermal conductivity.
		Author: E. Chavez	Category: Contrib. Oral
		Paper #: 0111	Time: 6:40 pm -6:55 pm
		Title: Acoustic phonon relaxation rates in nanometer-scale membranes
		Abstract: The elastic continuum model is applied to analyse the acoustic phonon modes for single and threelayer membranes. The dispersion relations are computed using a numerical approach and are compared with experimental and theoretical results. These values are used to compute the rate of relaxation, considering a three-phonon Umklapp process.
		Author: M. C. George	Category: Contrib. Oral
		Paper #: 0081	Time: 6:55 pm -7:10 pm
		Title: Thermal conductance behavior of self-assembled lamellar block copolymer thin films
		Abstract: We measure the thermal conductance of both disordered and self-assembled lamellar polystyrene-block-poly(methyl methacrylate) copolymer films and compare the results to literature reports on thin homopolymer films and polymer brushes. We see a 150% increase in thermal conductivity for a single self-assembled PS-b-PMMA layer.
		Adjourn	7:10 PM