dc.contributor.author | Ward, GP | |
dc.contributor.author | Hibbins, AP | |
dc.contributor.author | Sambles, JR | |
dc.contributor.author | Smith, JD | |
dc.date.accessioned | 2018-02-23T11:50:04Z | |
dc.date.issued | 2016-07-12 | |
dc.description.abstract | The angular dependence of the transmission of sound in air through four types of 2D slit-arrays
formed of aluminium slats is explored, both experimentally and numerically. For a simple, subwavelength
periodic slit-array, it is well known that Fabry-Perot-like wave-guide resonances, supported
by the slit-cavities, hybridising with bound acoustic surface waves, result in ‘Enhanced Acoustic
Transmission’ at frequencies determined by the length, width and separation of each slit-cavity. We
demonstrate that altering the spacing or width of some of the slits to form a compound array (i.e.
an array having a basis comprised of more than one slit) results in sharp dips in the transmission
spectra, that may have a strong angular dependence. These features correspond to ‘phase resonances’,
which have been studied extensively in the electromagnetic case. This geometry allows for
additional near-field configurations compared to the simple array, whereby the field in adjacent cavities
can be out-of-phase. Several types of compound slit-array are investigated; one such structure
is optimised to minimise the effect of boundary-layer loss mechanisms present in each slit cavity,
thereby achieving a deep, sharp transmission minimum in a broad maximum | en_GB |
dc.description.sponsorship | The authors would like to thank the UK Ministry of Defence’s
Defence Science and Technology Laboratorty (DSTL)
for their financial support and permission to publish | en_GB |
dc.identifier.citation | Vol 94, article 024304 | en_GB |
dc.identifier.doi | 10.1103/PhysRevB.94.024304 | |
dc.identifier.uri | http://hdl.handle.net/10871/31629 | |
dc.language.iso | en | en_GB |
dc.publisher | American Physical Society | en_GB |
dc.title | Acoustic transmission through compound subwavelength slit arrays | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2018-02-23T11:50:04Z | |
dc.identifier.issn | 0163-1829 | |
dc.description | This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record. | en_GB |
dc.identifier.journal | Physical Review B - Condensed Matter and Materials Physics | en_GB |