The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Metamaterials enable the engineering of refractive index into the intriguing negative regime. Such negative index metamaterials (NIMs) can give rise to unique optical properties like negative refraction and backward waves. Similarly, zero index metamaterials (ZIMs) are widely studied recently for they open a new route to realize uniform phase distribution and coherent coupling even within a large...
Metamaterials are designed to achieve unprecedented light-matter interactions. Here we demonstrate a novel viable and scalable assembly route to optical metamaterials with structures dictated by their own light-matter interactions.
We introduce a new method to localize lightwaves. We show how the interaction of a gain medium with a planar deep-UV plasmonic heterostructure, at its zero-vg point, strongly localizes light. A quantum-coherent drive provides a means to control the localization and dramatically improve the dynamics.
Phase-matching is critical for coherent nonlinear optical processes, allowing nonlinear sources to combine constructively, resulting in more efficient emission. We experimentally demonstrate phase mismatch-free nonlinear propagation in a bulk zero index metamaterial.
We demonstrate truly deep sub-wavelength nanoscale metamaterial optical nanocavities with anomalous scaling laws, by incorporating indefinite metamaterials with hyperbolic dispersion. Cavities with sizes down to ∼ λ/20 and high effective refractive index of 17.4 are realized.
We demonstrate an electrically controllable light-matter interaction in a gate-controlled active graphene terahertz metamaterial, which shows an electrically controlled memory effect as well as the modulation of terahertz waves in the extreme subwavelength-scale.
We demonstrate an electrically controllable light-matter interaction in a gate-controlled active graphene metamaterial, which shows an electrically controlled memory effect as well as the modulation of terahertz waves in the extreme subwavelength-scale.
We realize three-dimensional nanoscale optical cavities with anomalous scaling laws, by incorporating indefinite metamaterial with hyperbolic dispersion. Optical cavities with sizes down to ∼ λ/12 and high refractive index of 17.4 are demonstrated.
In this paper, we discuss the development of a bulk negative refractive index metamaterial made of cascaded “fishnet” structures, with a negative index existing over a broad spectral range. We describe in detail the design of bulk metamaterials, their fabrication and characterization, as well as the mechanism of how coupling of the unit cells can reduce loss in the material through an optical transmission-line...
Transformation optics provides a new design methodology allowing unprecedented manipulation of light propagation. Traditionally, optical elements only involve stretching or compressing the optical space in one direction whereas the remaining dimensions are unaltered. However, space can be modified in all dimensions simultaneously so that the additional degrees of freedom provided by transformation...
Anisotropic metamaterial made of nanowire array can realize negative refraction of light even without a negative phase index of refraction. Using this material, we were able to achieve lensing action with micron-thick slab and demonstrate imaging of a slit object. The details of the focused light beam in 3-dimensional space have been mapped with NSOM.
The optical response of fishnet metamaterial can be modulated in femtosecond time scale. This modulation dynamics is mainly determined by the constituting dielectric medium, but the modulation magnitude is greatly enhanced through the plasmon resonance.
We report the first bulk metamaterials at visible frequencies that shows intriguing negative refraction for all incident angles. The metamaterial is realized by growing silver nanowire in a porous alumina template.
We experimentally demonstrate cloaking at optical frequencies. A dielectric carpet cloak is designed to hide object under a curved reflecting surface by mimicking the reflection from a flat surface, enabling broadband invisibility with low loss.
Recent theory predicted a new class of meta structures made of engineered sub wavelength entities - meta ldquoatomsrdquo and ldquomoleculesrdquo which enable the unprecedented electromagnetic properties that do not exist in the nature. For example, artificial plasma and artificial magnetism, and super lens that focuses far below the diffraction limit. The metamaterials may have profound impact in...
Contribution of electric quadrupole resonance is studied in optical metamaterials through numerical simulation. For nanostructures, its radiation is often comparable to that from magnetic dipole. Their individual contributions can be determined by angle-resolved scattering spectroscopy.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.