# 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.

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### Field propagation in metamaterial based optical fibres?

We have an optical fibre having HMM cladding ( $\mu=1$ and have a permittivity tensor with one component different in sign than others) and a core having permittivity equal to one. How will light ...
1 vote
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### Snell's law in materials having negative permittivity only?

We have reverse Snell's law in negative index materials (having negative permittivity and permeability). If we have a material with only negative permittivity , then can we also have reverse Snell's ...
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### Deriving dispersion relation of hyperbolic material

I am trying to derive the following form of the dispersion relation for hyperbolic material: From the literature, this dispersion relation is achieved by setting the determinant of the below matrix ...
• 101
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### Induced Electric field in metasurface

In CST Microwave Studio, for metasurface simulation, the defined electric field for the incident linearly polarized plane wave is 1 V/m. However, the induced electric field for the unit cell of the ...
1 vote
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### Help with Parametrizing Path Through High-Symmetry Points in 2D Hexagonal Brillouin Zone

I'm currently working on a project involving the calculation of band structures for a 2D hexagonal lattice, and I need some guidance on how to properly parametrize a path that covers the high-symmetry ...
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### Can the refractive index of a medium be negative?(<0)

Recently I was asked in a test what would happen if the refractive index of a medium was negative. Is it possible really? The refractive index is the ratio of the speed of light in a vacuum and ...
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### How to derive the effective permeability for split ring resonator?

in Pendry's 1999 paper "Magnetism from Conductors and Enhanced Nonlinear Phenomena", he give the formula of effective relative permeability $mu_r$ of split ring resonator (SRR) which is one ...
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### Can someone tell me why there are two values for the dielectric constant from this website?

I have been looking up at available database that had dielectric constants for metals since I need them for my research and wanted to get an idea of what the values were before I focus on actually ...
1 vote
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### What photonic properties of a subwavelength plasmonic cavity make it generate saturated structural colour in just one layer?

I have a photonics question regarding a paper I am reading. Physics is not my area of study so please be kind :)) https://doi.org/10.1126/sciadv.adf7207 In this paper, the group has fabricated a self-...
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### Left-handed antiphotons in negative-index material?

Do “left-handed” antiphotons propagate in negative-index metamaterials? https://pubs.aip.org/physicstoday/article/57/6/37/914849/Reversing-Light-With-Negative-RefractionMaterials Some quotes from the ...
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### In order to cool below the ambient air temperature using passive radiative cooling during daytime why is it important to radiate heat into space? [closed]

Why not radiate it instead of the surrounding air, like Air conditioners? I know an air conditioner does not transfer/dump heat to the outside by radiation, but by phase transformation-specifically ...
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### Poynting vector and negative index of refraction

Why are the Poynting vector and the wavevector not pointing in the same direction in negative-index media?
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### Could you magnetize and at the same time elactrostatically charge a piece of rusted iron?

Pure iron rust (i.e. iron oxide) can be electrostatically charged and also magnetized. In a piece of iron usually the surface starts rusting leaving the interior untouched. Is it possible to have such ...
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### Simple Analogies for the Oberth Effect

I am just trying to create a simple analogy so that the Oberth effect makes sense. Here is my best attempt: The energy imparted by a photon to a mirror during reflection is very small. If put a ...
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1 vote
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### 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 ...
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### 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
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### 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 ...
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### 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 ...
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### 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 ...
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### 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, ...
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### 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 ...
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### 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 ...
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### 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
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### 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, ...
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### 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 ...
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### 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
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### 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 ...
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1 vote
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### 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 ...
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### 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 ...
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### 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
145 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 ...
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### 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 ...