Phonon‐polariton entrapment in homogenous surface phonon cavities. Issue 5 (5th February 2016)

• Record Type: Journal Article
• Authors: Yudistira, Didit; Boes, Andreas; Dumas, Benjamin; Rezk, Amgad R.; Yousefi, Morteza; Djafari‐Rouhani, Bahram; Yeo, Leslie Y.; Mitchell, Arnan
• Is Part Of: Annalen der Physik. Volume 528:Issue 5(2016)
• Page Start: 365
• Page End: 372
• Publication Date: 2016-02-05
• Subjects: phononic crystals -- phononic bandgap -- domain inversion lithium niobate -- phonon polariton -- surface acoustic wave; Physics -- Periodicals; Chemistry -- Periodicals; 530.05
• DOI: 10.1002/andp.201500348
• Languages: English
• ISSNs: 0003-3804

Abstract

Abstract : Surface phonon cavity formed by the placement of a defect of a single domain within periodic domain inversion of single crystal piezoelectric lithium niobate exhibiting surface phononic bandgap through the phonon‐polariton coupling is introduced. It is shown that the proposed cavity can exhibit entrapment of phonon‐polariton, indicated by the simultaneous localization of both surface phonons and the electric within the defect. Abstract : Surface phonon cavities that are homogenous in both mechanical and dielectric properties are reported. The cavities are formed by the placement of a defect of a single domain within periodic domain inversion of single crystal piezoelectric lithium niobate that exhibits surface phononic bandgap through the phonon‐polariton coupling. Surface cavity resonances are observed within the bandgap, which manifest in entrapment of phonon‐polariton within the defect. In addition to demonstrating that the observed resonances are non‐radiative and decoupled to bulk radiation, which is critical for high Q cavities, it is also shown the possibility to tune the surface cavity resonance spectra simply by varying the defect width. Such an ability to excite surface cavity resonance that is non‐radiative with simultaneous localization of the electric field together with the advantage of a cavity that is physically formed from a completely monolithic and uniform material offers unique opportunities for widespread applications for example in actuation, detection, and phonon lasing that can be fully integrated with other physical systems such as quantum acoustics, photonics, and microfluidics.