Work

A design of frequency-isolated full-k-space flatband in phononic crystals for ultrasensitive detection and high-Q cavities

Year: 2025

Type: article

Abstract: Flatbands in artificial lattices hold significant potential for novel applications. They are generally constrained to specific regions in momentum space and can be obtained by tight-binding approximation. This study demonstrates an innovative band engineering strategy that successfully constructs a frequency-isolated flatband spanning the entire Brillouin zone in a two-dimensional phononic crystal. Notably, the acoustic pressure field in this flatband locates mainly in water background rather than steel scatters, which indicates that the strategy to achieve flatbands is beyond the picture of tight-binding approximation. Characterized by vanishing group velocity and singular density of states, phononic crystals with such flatbands can be used as ultrasensitive detectors of background and boundary-free acoustic cavities with high quality factors.

Source: Journal of Applied Physics

DOI: 10.1063/5.0255320

Authors: Marwa Hamid Eldegail, Lingzhe Kong, Ye Bai, Changqing Xu

Institution: Nanjing Normal University

Language: English

Topic: Acoustic Wave Phenomena Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,500

Funders: Ministry of Education of the People's Republic of China, Jiangsu Science and Technology Department, Graduate Research and Innovation Projects of Jiangsu Province