Metamaterial eENZ can control correlations of light
When designing a light source, one typically restricts their aim to certain correlation properties. For example, in a single-mode laser, correlations can be found across the entire wavefront. However, optical cavities that support only a single mode are usually relatively difficult to manufacture.
A cavity that supports multiple modes is easier to fabricate, but in such a laser the correlations vanish, depending on the number of modes present.
“Both of these source types have their uses and in the past 20 years, a lot of effort has been expended to attain the best of both worlds. A few years ago, the idea of switching correlation properties came up and it has gotten considerable attention ever since,” says Postdoctoral researcher Matias Koivurova from Tampere University.
The team’s approach is more sophisticated than earlier attempts and achieves near perfect switching between high and low correlation states.
By inserting an eENZ mirror as one of the cavity mirrors, the conventional multimode cavity is modified to support only one mode, regardless of the resonator parameters. What makes this modification possible is that the eENZ mirror behaves like an angular pinhole: when the incident light has a suitable polarization, it reflects light in a relatively narrow cone only.
Enhanced ENZ has a number of potential applications
The eENZ mirror has a peculiar response to different polarizations of light. When transverse electric (TE) polarized light impinges upon it, the metamaterial behaves more like a conventional mirror. On the other hand, when the polarization is rotated 90 degrees to transverse magnetic (TM), the angular pinhole effect becomes prominent.
The TM-polarized light excites so called Ferrell-Berreman modes within the material, strongly attenuating light that hits the eENZ mirror at a large enough angle.
“By controlling the polarization of the light inside the cavity, our team was able to switch the correlation properties of the light at will, going from nearly uncorrelated to completely correlated.
Now we just need to build the device!” Koivurova concludes.
The study is the first to demonstrate solid state switching of correlation properties and it is expected to find applications in imaging, flow detection, free-space telecommunication, and even inertial confinement. Additionally, the eENZ mirror allows for relatively easy fabrication of small and high-quality lasers.
The study titled “Coherence Switching with Metamaterials” was published in Physical Review Letters as an Editor’s Suggestion (https://doi.org/10.1103/PhysRevLett.127.153902). The new type of metamaterial was introduced by the same team last year in the New Journal of Physics (https://doi.org/10.1088/1367-2630/abb387), and this most recent study is the first to showcase potential applications for its intriguing properties.
Journal: Physical Review Letters
Subject of Research: Not applicable
Article Title: Coherence Switching with Metamaterials
Article Publication Date: 6-Oct-2021
All latest news from the category: Physics and Astronomy
This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.
innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.
Under arrest: Using nanofibers to stop brain tumor cells from spreading
Researchers from Japan develop a platform based on nanofibers to trap brain cancer cells as a therapeutic strategy. Our body heals its injuries by essentially replacing damaged cells with new…
New photonic chip for isolating light may be key to miniaturizing quantum devices
Light offers an irreplaceable way to interact with our universe. It can travel across galactic distances and collide with our atmosphere, creating a shower of particles that tell a story…
A traffic light for light-on-a-chip
Integrated photonics allow us to build compact, portable, low-power chip-scale optical systems used in commercial products, revolutionizing today’s optical datacenters and communications. But integrating on-chip optical gain elements to build…