In recent years, how to fully manipulate the polarization state of linearly polarized (LP) light has become an emerging research hotspot in the region of photonics. Here, a novel alternative approach based on all‐dielectric metasurfaces to realize and control the polarization state of light with broadband and high transmission is theoretically and numerically investigated. In contrast with the polarization rotation mechanism of non‐chiral metasurfaces, the proposed configuration can be illustrated by the Jones matrix in a theoretical analysis. The proposed design is based on multi‐conversion of the incident linearly polarized light in a double‐layer quarter‐wave plate structure. Through an elaborate design of the structural units, a one‐layer quarter‐wave plate structure can convert a linearly polarized light to a circularly polarized state. An arbitrary polarization rotation with high efficiency (>88%) and broadband (approximately equal to the bandwidth of quarter‐wave plate) can be achieved through the collective effect of the two quarter‐wave plates. The proposed approach based on all‐dielectric metasurfaces exhibits the capacity of arbitrarily manipulating the polarization states, which can facilitate future applications in photonics.

We propose a novel design of photonic crystal fiber to achieve the single-polarization single-mode transmission. The topology of this design only employs, with a view to simplicity and stability, uniformly sized circular air holes, and they are all regularly latticed in a pure-silica background. Guiding properties are studied by use of the full-vector finite element method, combined with perfectly matched layers as absorbing boundary conditions. It has been found that, increasing the hole-to-pitch ratio can be performed to broaden the SPSM band, however subject to a qualification that the radio should be inadequate to open a bandgap. In addition, influences of the ring number and the inner cladding coverage on transmission characteristics have been thoroughly investigated. An optimized sample is deliberately designed to offer an SPSM band with width of 120nm, centered at =1.55μm. Moreover, the proposed design demonstrates low confinement loss, high nonlinear coefficient, as well as excellent bending resistance.