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Related Experiment Video

Updated: Jun 16, 2026

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Published on: February 25, 2017

One-dimensional hypersonic phononic crystals.

N Gomopoulos¹, D Maschke, C Y Koh

¹Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

|February 10, 2010

Summary

This summary is machine-generated.

Researchers observed a phononic band gap in a multilayer film at gigahertz frequencies. This finding, using Brillouin spectroscopy, opens avenues for novel phononic devices.

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Area of Science:

Materials Science
Acoustics
Nanotechnology

Background:

Periodic multilayer structures are investigated for their unique wave propagation properties.
Phononic band gaps, frequency ranges where elastic waves are forbidden, are crucial for phononic device applications.
Gigahertz frequency phononics presents opportunities for advanced signal processing and sensing.

Purpose of the Study:

To experimentally observe a normal incidence phononic band gap in a one-dimensional periodic SiO(2)/poly(methyl methacrylate) multilayer film.
To investigate the elastic wave propagation behavior in the film at gigahertz frequencies.
To explore the potential of the film's porous structure for introducing secondary active media.

Main Methods:

Brillouin spectroscopy was employed for experimental observation of the phononic band gap.
One-dimensional periodic multilayer films of SiO(2) and poly(methyl methacrylate) were fabricated.
Numerical simulations were used to validate the observed phononic properties.

Main Results:

A normal incidence phononic band gap was experimentally observed at gigahertz frequencies.
A band gap to midgap ratio of 0.30 was determined for elastic wave propagation along the periodicity direction.
In-plane elastic wave propagation exhibited effective medium behavior.
Numerical simulations accurately reproduced the experimental phononic properties.

Conclusions:

The study successfully demonstrated a phononic band gap in a SiO(2)/poly(methyl methacrylate) multilayer film at gigahertz frequencies.
The film's structure supports distinct elastic wave behaviors depending on propagation direction.
The porous silica layers offer potential for integrating active media for phonon coupling with other excitations.