TY  - EJOU
AU  - Cheng, Haoyi 
AU  - Guo, Jingwen 
AU  - Ye, Wenjing 
AU  - Zhang, Xin 

TI  - Frequency-Multiplexed	Acoustic	Metasurfaces	Based	on	Multiobjective	 Topology	Optimization
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 26
IS  - 2
SN  - 1933-2815

AB  - With	their	thin	thicknesses	and	unprecedent	wave	manipulation	capabilities,	acoustic	metasurfaces	have	a	
great	potential	to	be	applied	in	a	wide	range	of	applications.	Most	existing	metasurfaces	are	passive	devices.	
Although	passive	devices	are	easy	to	implement	and	consume	no	energy,	one	major	shortcoming	of	passive	
devices	is	their	fixed	and	limited	functionality,	which	greatly	limits	their	application	scope.	To	increase	the	
functionalities	of	a	metasurface	and	yet	still	maintain	its	passivity,	we	propose to	use	the	wave	frequency	as	
a	 tuning	 freedom	 to	 realize	multiple	 functionalities	in	one	single	passive	device.	Specifically,	 the	passive	
metasurface	will	be	designed	to	possess	different	functions	at	different	operation	frequencies.	By	changing	
the	wave	frequency,	the	metasurface	will	switch	its	functionalities.	In	this	talk,	we	will	present	the	general	
design	methodology,	which	is	based	on	multi-objective	topology	optimization	and	genetic	algorithm.	Several	
frequency-encoded	 multifunctional	 acoustic	 metasurfaces,	 for	 example,	 a	 metasurface	 that	 can	 perform	
wave	focusing	and	beam	steering,	designed	using	the	methodology	will	be	demonstrated.	Both	simulation	
and	 experimental	 results	 will	 be	 presented	 and	 compared.	 In	 addition,	 the	 underlying	 mechanisms	 of	
multifunctional	characteristics	will	be	discussed.
KW  - Topology	optimization; multiobjective	optimization; acoustic	metasurfaces; wave	manipulation; frequency	 multiplexing

DO  - 10.32604/icces.2023.09237