Acoustic rainbow trapping by coiling up space

Xu Ni, Ying Wu, Ze-guo Chen, Li-Yang Zheng, Ye-Long Xu, Priyanka Nayar, Xiao-Ping Liu, Ming-Hui Lu, Yan-Feng Chen

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


We numerically realize the acoustic rainbow trapping effect by tapping an air waveguide with space-coiling metamaterials. Due to the high refractive-index of the space-coiling metamaterials, our device is more compact compared to the reported trapped-rainbow devices. A numerical model utilizing effective parameters is also calculated, whose results are consistent well with the direct numerical simulation of space-coiling structure. Moreover, such device with the capability of dropping different frequency components of a broadband incident temporal acoustic signal into different channels can function as an acoustic wavelength division de-multiplexer. These results may have potential applications in acoustic device design such as an acoustic filter and an artificial cochlea.
Original languageEnglish (US)
JournalScientific Reports
Issue number1
StatePublished - Nov 13 2014


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