Questions tagged [metamaterials]

Artificial materials with $\varepsilon$ and $\mu$ not found in nature. The "atoms" are sub-wavelength. Includes negative-index materials, superlenses, split-ring resonators, wire media and backwards wave propagation.

Filter by
Sorted by
Tagged with
0
votes
0answers
12 views

How would a backward propagating sound wave behave in a roton producing metamaterial medium?

Phys.org link to paper: Roton producing metamaterials could theoretically make sound waves beyond certain wavelengths, propagate backwards. Does it mean reversed sound, or will it be able to traverse ...
0
votes
0answers
11 views

Does less than half a wavelength antenna spacing help?

In Metamaterial based Holographic Beamforming (https://pivotalcommware.com/wp-content/uploads/2017/12/Holographic-Beamforming-WP-v.6C-FINAL.pdf), the spacing of the elements is much lesser than half ...
1
vote
2answers
42 views

Is it possible to make invisibility cloak in real? [closed]

I am a materials science undergraduate student. I have a question out of curiosity if it is possible to make a material that can completely make things invisible? What are the problems we will ...
0
votes
0answers
12 views

Control of reflected wave through metasurface

When a wave impinges on a metasurface, one can tune the metasurface to control the direction of the reflected wave. I would like to know whether it is possible to make a 3D control of the direction. I ...
1
vote
0answers
21 views

Why dispesion relation in a 2d plane related to the poles of green's function?

I'm looking at a paper about deriving the dispersion relation in a metasurface, the paper claims that 'The modes supported by an anisotropic metasurface are provided by the poles of the Green’s ...
0
votes
1answer
20 views

Can metamaterial works for ultra short pulses?

I have read little bit about metamaterials and understand that one can create new structure such that some of characteristic of usual elctromagnetic behaviour can be altered while propagating through ...
0
votes
0answers
39 views

Poynting vector in metamaterials

Poynting vector in a material with magnetic permeability $\mu$ is defined as $\mathbf{S}=\frac{1}{\mu}(\mathbf{E} \times \mathbf{B})$ In certain media $\mu$ can be negative. In that case, $S$ will ...
0
votes
0answers
15 views

Penetration depth in thin-wire structures

In Pendrys paper (J. Phys.: Condens. Matter 10 (1998) 4785-4809) penetration depth is calculated using London penetration depth definition and permittivity \begin{equation}\varepsilon_{metal}=1-\frac{\...
0
votes
0answers
9 views

Are super dielectric materials magnetic?

Alumina powder mixed with boric acid and water is a super dielectric metamaterial, would it be attracted to a magnetic field? (Is it diamagnetic or paramagnetic?)
2
votes
2answers
98 views

How derive a spring constant of a helically turned helix based on elasticity of the material and the geometry? [closed]

The structure has helicities on two levels and looks like the tungsten wire in an incandescent light bulb: How, if at all, can the spring constant be derived from elastic properties of the material, ...
0
votes
0answers
21 views

Experimentally measure penetration depth for metamaterials?

I have simulated a high penentration metasurface design and want to fabricate it. |E|^2 decays above the metasurface with very long ~ 1um decay length. What would be a good experimental way to measure ...
0
votes
1answer
34 views

AC field propulsion

Assuming that we have a metamaterial that can slow down the velocity of propagation of changes in an EM field to around 15 000 m/s (without felling or applying any forces), can we build a propulsion ...
0
votes
0answers
28 views

Metamaterial with index of refraction different in opposite directions

Has anyone created a mathematical model for a material whose index of refraction is different going right than it is for light traveling to the left?
1
vote
1answer
29 views

What is the difference between ordinary-spacial cloaking and spacetime cloaking?

I am unsure of what are the differences between space time cloaking and spacial cloaking, as any event can be hidden from a viewer using spatial cloaking for however long the cloaking is activated, ...
1
vote
0answers
46 views

Strange material, Bydrogen

Let's take a hypothetical scenario in which you manage to make a meta material in which the bulk of the mass is made of by a central negative nucleus and that has a single spin 1 boson whizzing around ...
1
vote
0answers
115 views

List of complex refractive indices for various frequencies and various materials

I want a list of refractive index values for various materials (or even a single material) for various frequencies / wavelengths (I need this specifically for the micro wave - radio wave regions of ...
1
vote
0answers
45 views

FDTD simulations for metamaterials and complex refractive index

I have designed a working FDTD code to simulate electromagnetic wave propagation using Yee's algorithm. I have been able to place materials such as glass slabs, etc which have positive and real ...
1
vote
1answer
85 views

What is a Material Called that Translates the Image of a Touching Object's Surface?

What is the name of a material that moves light through it in such a way that it appears that the surface of an object has translated through the material? Also, what is an example of this type of ...
0
votes
0answers
89 views

Metamaterial/Optics Book Recommendation

I recently won a prize at my school for physics (£25) for which they ask that we spend some money they have given us on a book with which they can present us during an assembly. Given that over the ...
-1
votes
3answers
131 views

Would a metamaterial change its properties if one used different isotopes of an atom in its construction?

Given one had a metamaterial of a given type, containing some limited types of elements... if one were to use just one isotope of a given element (assuming it had more than one) in the construction ...
1
vote
1answer
108 views

Induced EMF in metamaterial

I am reading JB Pendry's original paper on metamaterials (Magnetism from Conductors, and Enhanced Non-Linear Phenomena) and I am really having some trouble understanding just a few of his mathematical ...
1
vote
2answers
146 views

Perfect reflection with metamaterials with indices of refraction less than one

Total internal reflection is used to send light signals long distances in fiber-optic cables. If the cable is shaped into a ring, the light will run in a circle until its intensity dwindles due to ...