Photonics Insights will be a high-quality，peer-reviewed, Diamond Open Access journal. It will feature review articles which present the current status of a given topic, with background, research progress, conclusions, and possible future developments.
The image on the cover of Photonics Research Volume 9, Issue 4, demonstrates temperature tunable spectral broadening using a nonlinear ultra-silicon-rich nitride device consisting of a 3-mm-long cladding-modulated Bragg grating and a 7-mm-long nonlinear channel waveguide. Provided by Y. Cao et al., researchers from Singapore University of Technology and Design, Ecole Polytechnique Fédérale de Lausanne, Institute of Microelectronics, A*STAR and The University of Sydney, the image is based on the research presented in their article "Thermo-optically tunable spectral broadening in a nonlinear ultra-silicon-rich nitride Bragg grating", Photonics Research 9(4) 04000596, doi 10.1364/PRJ.411073.
The image on the cover of Chinese Optics Letters Volume 19, Issue 4, indicates that a new type of optical bi-layer metasurface system is designed and studied, which is based on subwavelength metal slit arrays with phase-gradient modulation, referred to as metagratings (MGs). Provided by Q. Shi et al., researchers from Soochow University, Nanjing University of Aeronautics and Astronautics and North University of China, the image is based on the research presented in their article "Optical beam splitting and asymmetric transmission in bi-layer metagratings", Chinese Optics Letters 19(4) 042602, doi 10.3788/COL202119.042602.
The image on the cover of Photonics Research Volume 9, Issue 3, presents a new imaging modality, deep compressed imaging via optimized-pattern scanning, which can significantly increase the acquisition speed for a single-detector-based imaging system. Provided by K. Zhang, J. Hu and W. Yang, researchers from University of California, the image is based on the research presented in their article "Deep compressed imaging via optimized pattern scanning", Photonics Research 9(3) 03000B57, doi 10.1364/PRJ.410556.
The image on the cover of Chinese Optics Letters Volume 19, Issue 3, indicates that under near-ultraviolet excitation at 394 nm, optimal Sr2LaTaO6: 0.2Eu3+ phosphors emitted high-brightness red light around 613 nm with the International Commission on Illumination chromaticity coordinates (0.650, 0.349). Provided by Z. Zhang et al., researchers from Taiyuan University of Technology, the image is based on the research presented in their article "High-brightness red-emitting double-perovskite phosphor Sr2LaTaO6: 0.2Eu3+ with high color purity and thermal stability [Invited]", Chinese Optics Letters 19(3) 030003, doi 10.3788/COL202119.030003.
We investigate the influences of structure parameters and interface shapes on the bandwidth of the one-way edge state of lithium niobate valley photonic c
We investigate the influences of structure parameters and interface shapes on the bandwidth of the one-way edge state of lithium niobate valley photonic crystals. By increasing the size difference of two air holes in the same unit cell, we find that the bandwidth of the lossless one-way nontrivial edge state possesses a peak value of 0.0201 (a/λ), which can be used to construct broadband valley photonic crystal waveguide. Mode field distributions verify that the waveguide is robust against sharp bend and exhibits chirality. When the unit cell is arranged in bearded interface with top and bottom components showing negative and positive valley Chern numbers respectively, we find that lithium niobate valley photonic crystal is more likely to exhibit a lossless edge state, which is difficult to be realized in valley waveguides with low refractive index materials. This work can provide a guidance on the design of the high-performance topological waveguide. show less
In this paper, we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity, and constitute an eye-safe single longitudi
In this paper, we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity, and constitute an eye-safe single longitudinal mode Er:YAG vector laser. A q-plate is employed as spin-orbital conversion element to modulate transverse mode and obtain cylindrical vector beams. An optical isolator is employed as non-reciprocal element for ring cavity to enforce unidirectional operation and achieve single longitudinal oscillation. The characteristics of power, transverse intensity, polarization spectrum of the output beams are observed. The observed typical single longitudinal mode and highly matched special polarizations prove the successful tailoring of both longitudinal and transverse modes. show less
Lithium niobate (LiNbO3) is a versatile crystalline material for various photonic applications. With the recent advances in lithium-niobate-on-insulator (
Lithium niobate (LiNbO3) is a versatile crystalline material for various photonic applications. With the recent advances in lithium-niobate-on-insulator (LNOI) thin film technology, LiNbO3 has been regarded as one of the most promising platforms for multi-functional integrated photonics. In this work, we present the field enhancement due to collective resonances in arrayed LiNbO3 nanoantennas. These resonances arise from the enhanced radiative coupling of localized Mie resonances in the individual nanoparticles and Rayleigh anomalies due to in-plane diffraction orders of the lattice. We describe the pronounced differences in the field enhancement and field distributions for electric and magnetic dipoles, offering valuable information for the design and optimization of high-quality-factor optical metasurfaces based on LiNbO3.show less
Quantum random access codes (QRACs) are important comunication tasks which are usually implemented in prepare-and-measure scenarios. The receiver tries to
Quantum random access codes (QRACs) are important comunication tasks which are usually implemented in prepare-and-measure scenarios. The receiver tries to retrieve one arbitrarily- chosen bit of the original bit-string from the code qubit sent by the sender. In this paper, we analyse in detail the sequential version of the 3 → 1 QRAC with two receivers. The average successful probability for strategy of unsharp measurement is derived. The prepare-and-measure strategy within projective measurement is also discussed. And it is found that for sequential 3 → 1 QRAC with weak measurement cannot be always superior than the one with projective measurement as the 2 → 1 version be.show less