ArticleNanophotonics (Berlin, Germany)2026
Directional Polarization-Independent Double-Zero-Index Material in a Three-Dimensional Photonic Crystal With a Fourfold Semi-Dirac Point.
Article in Nanophotonics (Berlin, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We propose a strategy to realize directional polarization-independent double-zero-index materials within a three-dimensional photonic crystal. In the transition between two nodal rings with opposite Zak phases, a fourfold semi-Dirac point emerges at the Brillouin zone center. This point exhibits linear dispersions along one direction and quadratic dispersions along perpendicular directions in the momentum space. At the frequency of the semi-Dirac point, both the effective permittivity and permeability of the photonic crystal simultaneously reach zero along the direction of linear dispersions, whereas only one of them becomes zero along the directions of quadratic dispersions. We investigate typical wave manipulation characteristics of this directional double-zero-index material, such as total transmission of circularly polarized electromagnetic waves and highly collimated directional emission. Our study clarifies the connection between topological phase transitions, band dispersions, and double-zero-index properties in artificial materials, offering a general method for achieving directional double-zero-index materials with potential applications in wave manipulation.
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.