An indefinite permittivity medium (IPM) has been fabricated and optically characterized in mid-infrared spectral range (10.7 µm-11.3 µm). Phase and amplitude transmission measurements reveal two remarkable properties of IPMs: (i) transmission of sub-diffraction waves (as short as λ/4) can exceed those of diffraction-limited ones, and (ii) sub-diffraction waves can propagate with negative refractive index. We describe a novel double-detector optical technique relying on the interference between sub-diffraction and diffraction-limited waves for accurate measurement of the transmission amplitude and phase of the former.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.18.022734 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The wavelength of terahertz waves varies by two orders of magnitude. Long-wavelength terahertz images suffer from low spatial resolution due to the millimeter-level diffraction limit. Conventional resolution-enhancing methods are generally limited by sample types and field of view.
View Article and Find Full Text PDFUnidirectional guided-wave-driven metasurfaces for arbitrary wavefront control.
Nat Commun
July 2024
Department of Applied Physics, Zhejiang University of Technology, Hangzhou, 310023, China.
Metasurfaces are capable of fully reshaping the wavefronts of incident beams in desired manners. However, the requirement for external light excitation and the resonant nature of their meta-atoms, make challenging their on-chip integration. Here, we introduce the concept and design of a fresh class of metasurfaces, driven by unidirectional guided waves, capable of arbitrary wavefront control based on the unique dispersion properties of unidirectional guided waves rather than resonant meta-atoms.
View Article and Find Full Text PDFRestricting angles of incidence to improve super resolution in time reversal focusing that uses metamaterial properties of a resonator array.
J Acoust Soc Am
May 2024
Acoustics Research Group, Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.
Focusing waves with a spatial extent smaller than a half wavelength (i.e., super resolution or sub diffraction limit) is possible using resonators placed in the near field of time reversal (TR) focusing.
View Article and Find Full Text PDFDue to the sub-diffraction-limited size and giant field enhancement, plasmonic tweezers have a natural advantage in trapping metallic particles. However, the strict excitation condition makes it difficult to generate an arbitrary plasmonic field in a controllable manner, thus narrowing its practical applications. Here, we propose an all-optical plasmonic field shaping method based on a digital holographic algorithm and generate plasmonic vortex arrays with controllable spot numbers, spatial location, and topological charge.
View Article and Find Full Text PDFExtreme anisotropy and dispersion engineering in locally resonant acoustic metamaterials.
J Acoust Soc Am
September 2021
Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, USA.
Article Synopsis
- * Hyperbolic metasurfaces enable efficient acoustic wave interactions and diffraction-less sound movement, allowing for improved imaging and sound emission.
- * The design of locally resonant metamaterials can achieve extreme directional sound propagation, which is suitable for advanced manufacturing methods and offers new sound guiding possibilities at a small scale.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!