Simple acoustic metagrating for perfect two- and three-beam splitting

Abstract

Acoustic metasurfaces have been widely explored and attracted great attention for their extraordinary wavefront manipulation abilities. In this paper, we propose a simple acoustic metagrating with periodic grooves that can split a normally incident beam into two or three reflected beams. The amplitudes and power flows of different reflected beams can be manipulated by changing the groove parameters. The mirror reflected wave is suppressed for equal two-beam splitting case and allowed for three-beam splitting case. Theoretical analysis and numerical simulations are performed to demonstrate the perfect two- and three-beam splitting performances based on local power conservation. Our research work provides a simple method for designing acoustic beam splitters and has extensive applications in acoustic sensing and communication.

Polarization insensitivity induced for 1 × 9 splitter with T-type SiO2 grating ridge

“…Beam splitters have become integral components of modern optical devices, finding extensive applications in the teleportation of squeezed states, 1 photonic circuits, 2 – 4 optical communication, 5 – 7 displacement measurement, 8 , 9 nonreciprocal thermal emitter, 10 – 12 and optical sensing 13 , 14 . As an important type of beam splitter grating, multi-channel beam splitters have gained significant attention from researchers 15 …”

“…Beam splitters have become integral components of modern optical devices, finding extensive applications in the teleportation of squeezed states, 1 photonic circuits, [2][3][4] optical communication, [5][6][7] displacement measurement, 8,9 nonreciprocal thermal emitter, [10][11][12] and optical sensing. 13,14 As an important type of beam splitter grating, multi-channel beam splitters have gained significant attention from researchers. [15][16][17][18] Teng et al 19 proposed two types of quad-beam splitters based on coding metamaterials, which can achieve 1 × 4 and 2 × 2 beams, within the terahertz frequency range.…”