Interface nano-confined acoustic waves in polymeric surface phononic crystals

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4905850· OSTI ID:22399097

Travagliati, Marco ^[1]; Nardi, Damiano ^[2]; Giannetti, Claudio; Ferrini, Gabriele; Banfi, Francesco ^[3]; Gusev, Vitalyi ^[4]; Pingue, Pasqualantonio ^[5]; Piazza, Vincenzo ^[1]

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1. Center for Nanotechnology Innovation@NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, 56127 Pisa (Italy)
2. JILA and Department of Physics, University of Colorado, 440 UCB, Boulder, Colorado 80309 (United States)
3. i-LAMP and Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Via Musei 41, 25121 Brescia (Italy)
4. LAUM, UMR-CNRS 6613, Université du Maine, av. O. Messiaen, 72085 Le Mans (France)
5. NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza San Silvestro 12, 56127 Pisa (Italy)

The impulsive acoustic dynamics of soft polymeric surface phononic crystals is investigated here in the hypersonic frequency range by near-IR time-resolved optical diffraction. The acoustic response is analysed by means of wavelet spectral methods and finite element modeling. An unprecedented class of acoustic modes propagating within the polymer surface phononic crystal and confined within 100 nm of the nano-patterned interface is revealed. The present finding opens the path to an alternative paradigm for characterizing the mechanical properties of soft polymers at interfaces and for sensing schemes exploiting polymers as embedding materials.

• OSTI ID: 22399097
• Journal Information: Applied Physics Letters, Vol. 106, Issue 2; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTERIZED SIMULATION
CRYSTALS
DIFFRACTION
FINITE ELEMENT METHOD
FREQUENCY DEPENDENCE
INTERFACES
MECHANICAL PROPERTIES
NEAR INFRARED RADIATION
PHONONS
POLYMERS
SOUND WAVES
SURFACES
TIME RESOLUTION