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Physical Review Letters, ISSN 0031-9007, 04/2013, Volume 110, Issue 17, p. 175501
We report the experimental demonstration of a broadband negative refractive index obtained in a labyrinthine acoustic metamaterial structure. Two different... 
PHYSICS, MULTIDISCIPLINARY
Journal Article
Scientific reports, ISSN 2045-2322, 2016, Volume 6, Issue 1, p. 35437
... Passive Phased Array Yangbo Xie1,*, Chen Shen2,*, Wenqi Wang1, Junfei Li1, Dingjie Suo2, Bogdan-Ioan Popa1, Yun Jing2 & Steven A. Cummer1 Acoustic holographic... 
TRANSDUCER | VISIBLE-LIGHT | MANIPULATION | METASURFACE | MULTIDISCIPLINARY SCIENCES | Circuits
Journal Article
Nature communications, ISSN 2041-1723, 2018, Volume 9, Issue 1, pp. 5299 - 7
...ARTICLE Broadband sound barriers with bianisotropic metasurfaces Bogdan-Ioan Popa 1, Yuxin Zhai 1 and Hyung-Suk Kwon 1 Noise is a long standing societal... 
MULTIDISCIPLINARY SCIENCES | DYNAMIC HOMOGENIZATION | Mitigation | Isolators | State of the art | Broadband | Acoustic noise | Noise | Acoustic coupling | Control systems | Attenuation | Sound | Noise control | Active control
Journal Article
Physical review. B, Condensed matter and materials physics, ISSN 1550-235X, 2015, Volume 91, Issue 22
A major limitation of current acoustic metamaterials is that their acoustic properties are either locked into place once fabricated or are only modestly... 
PHYSICS, CONDENSED MATTER | Acoustic properties | Acoustic imaging | Condensed matter | Metamaterials | Real time | Devices | Slabs | Lenses
Journal Article
Physical review letters, ISSN 1079-7114, 2008, Volume 100, Issue 2, p. 024301
Through acoustic scattering theory we derive the mass density and bulk modulus of a spherical shell that can eliminate scattering from an arbitrary object in... 
PHYSICS, MULTIDISCIPLINARY | METAMATERIALS
Journal Article
Proceedings of the National Academy of Sciences - PNAS, ISSN 0027-8424, 8/2015, Volume 112, Issue 34, pp. 10595 - 10598
Journal Article
Nature communications, ISSN 2041-1723, 2014, Volume 5, Issue 1, p. 3398
Unidirectional devices that pass acoustic energy in only one direction have numerous applications and, consequently, have recently received significant... 
LENS | MULTIDISCIPLINARY SCIENCES | RECTIFIER | Models, Theoretical | Electronics - instrumentation | Algorithms | Acoustics - instrumentation | Equipment Design - methods | Computer-Aided Design | Manufactured Materials
Journal Article
Applied Physics Letters, ISSN 0003-6951, 09/2014, Volume 105, Issue 10, p. 101904
We present here two diffractive acoustic lenses with subwavelength thickness, planar profile, and broad operation bandwidth. Tapered labyrinthine unit cells... 
PHYSICS, APPLIED | METAMATERIALS | CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY | DIFFRACTION | SOUND WAVES | SIMULATION | FOCUSING | LENSES | THICKNESS | PULSES
Journal Article
Nature materials, ISSN 1476-4660, 2014, Volume 13, Issue 4, pp. 352 - 355
... omnidirectional acoustic ground cloak Lucian Zigoneanu, Bogdan-Ioan Popa and Steven A. Cummer* The control of sound propagation and reection has always been the goal... 
CHEMISTRY, PHYSICAL | PHYSICS, CONDENSED MATTER | PHYSICS, APPLIED | INVISIBILITY CLOAK | MATERIALS SCIENCE, MULTIDISCIPLINARY | Materials science | Acoustics | Sound design | Design engineering | Broadband | Control systems | Transformations | Sound | Metamaterials | Devices | Three dimensional
Journal Article
Nature communications, ISSN 2041-1723, 2014, Volume 5, Issue 1, p. 5553
Metasurfaces are a family of novel wavefront-shaping devices with planar profile and subwavelength thickness. Acoustic metasurfaces with ultralow profile yet... 
REFLECTION | MULTIDISCIPLINARY SCIENCES | METAMATERIALS | Physics - Materials Science
Journal Article
Journal of Optics (United Kingdom), ISSN 2040-8978, 04/2016, Volume 18, Issue 4, pp. 44018 - 44024
Optimization techniques are efficient methods to simplify the design of transformation optics devices. Asymmetric devices obtained through these methods... 
transformation optics | optimization | material parameter isocontour | Asymmetry | Mathematical analysis | Media | Transformations | Devices | Preserving | Optimization | Design optimization
Journal Article
Physical Review A - Atomic, Molecular, and Optical Physics, ISSN 1050-2947, 12/2011, Volume 84, Issue 6
We show that complex coordinates used in conjunction with transformation optics offer an extra degree of freedom that allows control over not only the... 
PHYSICS, ATOMIC, MOLECULAR & CHEMICAL | CLOAKS | OPTICS | SPACE | CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS | DEGREES OF FREEDOM | WAVE PROPAGATION | ELECTROMAGNETIC RADIATION | SENSITIVITY | AMPLITUDES | COORDINATES | TRANSFORMATIONS | LAYERS
Journal Article
Journal of Applied Physics, ISSN 0021-8979, 03/2011, Volume 109, Issue 5, pp. 054906 - 054906-6
We present the experimental realization and characterization of a broadband acoustic metamaterial with strongly anisotropic effective mass density. The... 
PHYSICS, APPLIED | MODULUS | Waveguides | Anisotropy | Analysis | Sound-waves
Journal Article
Physical review letters, ISSN 1079-7114, 2011, Volume 106, Issue 25, p. 253901
We present the design, fabrication, and performance analysis for a class of two-dimensional acoustic cloaking coatings in air. Our approach takes advantage of... 
DENSITY | OPTICAL CLOAK | PHYSICS, MULTIDISCIPLINARY
Journal Article
Applied Physics Letters, ISSN 0003-6951, 06/2009, Volume 94, Issue 24, pp. 244102 - 244102-3
We apply the theory of transformation electromagnetics to source arrays and show that a complex conformal antenna array can be made to behave like a... 
antenna theory | PHYSICS, APPLIED | antenna arrays
Journal Article
The Journal of the Acoustical Society of America, ISSN 0001-4966, 06/2016, Volume 139, Issue 6, pp. 3325 - 3331
...Anisotropic acoustic metafluid for underwater operation Bogdan-Ioan Popa, a) Wenqi Wang, Adam Konneker, and Steven A. Cummer Department of Electrical... 
ACOUSTICS | METAMATERIALS | CLOAKING | AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY
Journal Article
Applied physics letters, ISSN 1077-3118, 2013, Volume 103, Issue 20, p. 201906
present five kinds of labyrinthine or space-coiling acoustic metamaterials with tapered channels and apertures. These designs exhibit negative index behavior... 
PHYSICS, APPLIED | Broadband | Impedance matching | Coiling | Apertures | Metamaterials | Acoustics | Acoustic impedance | Mathematical models | Dispersions | Channels
Journal Article
Applied Physics Letters, ISSN 0003-6951, 08/2016, Volume 109, Issue 9, p. 91908
...A sound absorbing metasurface with coupled resonators Junfei Li, Wenqi Wang, Y angbo Xie, Bogdan-Ioan Popa, and Steven A. Cummer a) Department of Electrical... 
REFLECTION | PHYSICS, APPLIED | LOW-FREQUENCY SOUND | WAVE-FRONT | PERFECT | ACOUSTIC METAMATERIALS | ABSORPTION | RESONANCES | REFRACTION | BROAD-BAND
Journal Article
Physical Review A - Atomic, Molecular, and Optical Physics, ISSN 1050-2947, 09/2010, Volume 82, Issue 3
Transformation-optics devices of arbitrary shapes usually result in material parameters inside the device that feature level sets of different shapes.... 
CLOAKING | PHYSICS, ATOMIC, MOLECULAR & CHEMICAL | OPTICS | MATHEMATICAL SOLUTIONS | DESIGN | EIKONAL APPROXIMATION | CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS | APPROXIMATIONS | CALCULATION METHODS | CONFIGURATION | TWO-DIMENSIONAL CALCULATIONS | TRANSFORMATIONS | CYLINDRICAL CONFIGURATION | LAYERS
Journal Article
Microwave and Optical Technology Letters, ISSN 0895-2477, 10/2007, Volume 49, Issue 10, pp. 2574 - 2577
We describe a class of metamaterial particle that employs active elements to overcome the inherent limitations of their passive counterparts, such as... 
magnetic active metamaterials | active metamaterials | Magnetic active metamaterials | Active metamaterials | OPTICS | PLASMONS | ENGINEERING, ELECTRICAL & ELECTRONIC | Unit cell | Magnetic permeability | Mathematical analysis | Metamaterials | Dispersions | Permittivity | Microwaves | Delay
Journal Article
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