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http://hdl.handle.net/10397/88418
Title: | Single-sided acoustic beam splitting based on parity-time symmetry | Authors: | Liu, T Ma, G Liang, S Gao, H Gu, Z An, S Zhu, J |
Issue Date: | 1-Jul-2020 | Source: | Physical review B : covering condensed matter and materials physics, 1 July 2020, v. 102, no. 1, 014306, p. 014306-1-014306-8 | Abstract: | Unidirectional reflectionless resonance observed in parity-time-symmetric systems suggests a promising strategy to produce extremely asymmetric scattering. Inspired by such a unique feature, we propose a single-sided acoustic beam splitter that splits sound incident from a specific side but is totally transparent for sound incident from the opposite side. The unidirectional response is due to a parity-time-symmetric refractive index distribution. At the exceptional point when the real-part index and gain/loss modulations are balanced, it interacts with obliquely incident waves in a single-sided manner. In addition, by engineering the sidewall boundaries within an acoustic waveguide, we provide a general approach for obtaining the required complex refractive index, in which we show that the resistive or reactive component of the sidewall impedance can independently modulate the gain/loss or the real-part index. Based on this, a planar waveguide implementation of the single-sided acoustic beam splitter is demonstrated. Our study presents opportunities enabled by exploiting parity-time-symmetric systems in a higher-dimensional space and could find applications such as sensing and communication in a wide range of wave systems including but not limited to acoustics. | Publisher: | American Physical Society | Journal: | Physical review B : covering condensed matter and materials physics | ISSN: | 2469-9950 | EISSN: | 2469-9969 | DOI: | 10.1103/PhysRevB.102.014306 | Rights: | ©2020 American Physical Society The following publication Liu, T., Ma, G., Liang, S., Gao, H., Gu, Z., An, S., & Zhu, J. (2020). Single-sided acoustic beam splitting based on parity-time symmetry. Physical Review B, 102(1), 014306, 014306-1-014306-8 is available at https://dx.doi.org/10.1103/PhysRevB.102.014306 |
Appears in Collections: | Journal/Magazine Article |
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2014_PhysRevB.102.014306.pdf | 2.93 MB | Adobe PDF | View/Open |
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