The article was published on Phys.org.
There are wide-ranging applications for the light emitting devices. Ki Young Lee and a research team in physics and engineering in China and the UK have proposed to develop a structure of a submicron-printfoot size and high efficiency.
The device facilitates a highly desirable and efficient microlight emitter to detect a variety of applications.
The phenomena of photonic topology.
The topological interface states have a high level of robustness. The promise of the photonic topological phenomena has been investigated by many mathematicians and physicists.
Lee and colleagues looked at novel far-field optical properties. They showed how a topological junction meta surface of two guided-mode resonance gratings can be used as efficient light emitting devices.
The team used a junction with two separate guided mode gratings next to each other. The narrow beam of light came from the Jackiw-Rebbi state at the junction. The process was driven by two things. The team studied a fundamental theory of beam emission.
The structure of the JR state was explored by Lee and his team. The JR state led to beam leakage radiation towards the background, allowing characteristic features of leakage radiation to be gathered during the study.
The team looked at the emission properties of light sources near the junction. The radiation pattern was calculated using the finite element method. Two grating regions with the same Dirac mass could be designed to achieve ideal symmetry of the beam.
The narrow beam emission from isotropic light sources followed the exact properties of radiation leaking from the JR state. Modifications to the experimental setup, including a reduced index contrast and vertically coupled multilayer waveguides, were used to achieve the proposed beamed effect.
Many general applications of light sources rely on beam shaping. It is possible to regulate the beam shape directly from the source. The scientists explained the Dirac mass distribution.
A zero Dirac mass region can be extended around the junction of the device. Guided mode resonance dirac mass regulation can facilitate beam shaping applications.
The outlook is positive.
Ki Young Lee and colleagues proposed a meta surface for beam emission. They used the characteristic field of a Jackiw-Rabbi state at the junction to create a light beam that could be beamed from internal emitters.
The proposed architecture is significant to the creation of efficient light emitting devices. These properties are important for a number of applications. The proposed devices are able to work as efficient optical detectors due to their scope of acting as time-reversed emitters. The scientists would like to develop new optical effects and device applications that surpass technical limits.
Science Advances has more information about Ki Young Lee and his colleagues. There is a book titled "Sci Adv.add8349."
The Weyl exceptional ring was realized in an experimental manner.
Journal information: Nature Photonics , Science Advances
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