We propose a new type of noncanonical optical vortex, named "power-exponent-phase vortex (PEPV)". The spiral focusing the autofocusing Airy beams carrying PEPVs are experimentally demonstrated, and physical mechanism is theoretically analyzed by using energy flow far field mapping. In addition, influences parameters on focal fields orbital angular momenta also discussed. It expected that proposed corresponding conclusions can be useful for extension applications vortices, especially particle...

We propose the concept of perfect vectorial vortex beams (VVBs), which not merely have intensity profile independent polarization order and topological charge spiral phase, but also stable state (SoP) upon propagation. Utilizing a Sagnac interferometer, we approximately generate VVBs with locally linear elliptical polarizations, demonstrate that such can keep their SoP at certain propagation distance. These proposed be expanded to encode information quantum cryptography, as well enrich...

Metasurfaces provide a compact and powerful platform for manipulating the fundamental properties of light, have shown unprecedented capabilities in both optical holographic display information encryption. For increasing display/storage capacity, metasurfaces with more polarization manipulation channel full-color functionality are now an urgent requirement. Here, minimalist dielectric metasurface capability holography encoded arbitrary is proposed experimentally demonstrated. Without daunting...

We propose an efficient and robust method to generate tunable vector beams by employing a single phase-type spatial light modulator (SLM). With this method, linearly polarized Gaussian beam can be converted into with arbitrarily controllable polarization state, phase, amplitude. The energy loss during the conversion is greatly reduced depends mainly on reflectivity of SLM. experimentally demonstrate that efficiency about 47% achieved using SLM 62%. Several typical beams, including...

We experimentally and theoretically study the abrupt polarization transitions of vector autofocusing Airy beams associated with spin–orbit interactions. It is shown that when topological charges attached spiral phase are equal in number, local polarizations undergo an transition from linear to circular at focal point, orbital angular momentum partially converts into spin photons. The experimental results explained far-field properties terms Hankel transformations.

We present a flexible approach to generate arbitrary vector beams with trapezoid Sagnac interferometer. With the interferometer, different orders of two orthogonally polarized from computer-generated holograms coincide each other in Fourier spectrum domain, and coaxially combine into beams. This provides convenient way experimentally study properties complex polarization.

The contribution of this paper is to propose novel balanced and dual-band bandpass filters (BPFs), using quarter-mode (QM) eighth-mode (EM) substrate integrated waveguide (SIW) cavities, for the size reduction overall circuit. Two BPFs, which separately demonstrate a third-order Chebyshev response fourth-order quasi-elliptic response, are realized by properly choosing, feeding, coupling those QMSIW EMSIW cavities. Not only desired differential-mode operation within passband, but also good...

We propose a method to generate the high-order optical vortex in few-mode fiber via cascaded acoustically driven vector mode conversion. Theoretical analysis showed that conversion induced by grating (AIFG) could occur between two HE modes with adjacent azimuthal numbers. In experiment conducted at 532 nm, AIFGs were simultaneously same segment of radio frequency source containing different components. One AIFG was used convert left- and right-handed circular polarization fundamental...

Optical cryptography manifests itself a powerful platform for information security, which involves encrypting secret images into visual patterns. Recently, encryption schemes demonstrated on metasurface have revolutionized optical cryptography, as the versatile design concept allows unrestrained creativity. Despite rapid progresses, most efforts focus functionalities of rather than addressing performance issues, such deep capacity, and reconstruction quality. Here, we develop an scheme by...

Pancharatnam-Berry (PB) phase has become an effective tool to realize the photonic spin Hall effect (PSHE) in recent years, due its capacity of enhancing spin-orbit interaction. Various forms PSHEs have been proposed by tailoring PB light, however, propagation trajectory control separated states not reported. In this paper, we oscillated spin-dependent separation using well-designed optical elements based on transverse-to-longitudinal mapping Bessel beams. Two typical PSHEs, i.e., are...

Abstract Optical knots and links have attracted great attention because of their exotic topological characteristics. Recent investigations shown that the information encoding based on optical could possess robust features against external perturbations. However, as a superior coding scheme, it is also necessary to achieve high capacity, which hard be fulfilled by existing knot-carriers owing limit number associated invariants. Thus, how realize knot-based with capacity key problem solved....

In this paper, a multifunctional polarization conversion metasurface (MPCM) has been proposed that can switch between seven different transmissive and reflective modes. The basic unit cell consists of three layers split square rings (SSR) separated by two substrates, PIN diode is embedded in the top SSR to dynamically control asymmetric transmission reflection responses. layer-by-layer design guideline provided with mechanism illustrated. A prototype made up 20 × units was fabricated...

Orbital angular momentum (OAM) multiplexed holograms have attracted a great deal of attention recently due to their physically unbounded set orthogonal helical modes. However, preserving the OAM property in each pixel hinders fine sampling target image principle and requires fundamental filtering aperture array detector plane. Here, we demonstrate concept metasurface-based vectorial holography with cylindrical vector beams (CVBs), whose unlimited polarization orders unique distributions can...

Theoretical analysis and experimental demonstration are presented for the generation of cylindrical vector beams (CVBs) via mode conversion in fiber from HE11 to TM01 TE01 modes, which have radial azimuthal polarizations, respectively. Intermodal coupling is caused by an acoustic flexural wave applied on fiber, whereas polarization control necessary conversion, i.e. HE11x→TM01 HE11y→TE01 vibration along x-axis. The frequency RF driving signal actuating determined phase matching condition...

Cylindrical-vector beams (CVBs) with axial symmetry in polarization and field intensity are gathering increasing attention from fundamental research to practical applications. However, a majority of the CVBs generated by modulating light free space, temporal durations far away ultrafast regime. Here, an all-fiber based CVB laser is demonstrated via intermodal coupling two mode fibers. In domain, chirp-free pulses formed combined actions saturable absorption, self-phase modulation, anomalous...

We demonstrate a simple and compact Holmium-doped fiber femtosecond oscillator, in-band pumped by commercial Tm-doped laser. The oscillator operates in the dispersion managed soliton regime at net zero intracavity delivers >1 nJ pulse energy 35 MHz repetition rate. duration directly output is 160 fs FWHM, close to Fourier-limit of 145 FWHM. Using an additional nonlinear compressor stage, sub-100 FWHM durations could be achieved. implemented solid core highly for spectral broadening single...

The contribution of this letter is to propose a novel substrate integrated waveguide (SIW) dual-band balanced bandpass filter (BPF), which exhibits characteristics compact size and improved common-mode (CM) suppression. Two diagonal resonant modes TE102 TE302 in square SIW resonator with symmetric field distributions provide the possibility realize inputs/outputs, dual-passband responses vertically stacked structure for size. Without affecting differential-mode (DM) responses, method using...

We propose a generalized model for the creation of vector Bessel-Gauss (BG) beams having state polarization (SoP) varying along propagation direction. By engineering longitudinally Pancharatnam-Berry (PB) phases two constituent components with orthogonal polarizations, we create zeroth- and higher-order BG (i) uniform polarizations in transverse plane that change z following either equator or meridian Poincaré sphere (ii) inhomogeneous rotate during z. Moreover, evaluate self-healing...

We propose a compact and easy-to-align lateral shearing common-path digital holographic microscopy, which is based on slightly trapezoid Sagnac interferometer to create two laterally sheared beams form off-axis geometry. In this interferometer, the pass through set of identical optical elements in opposite directions have nearly same path difference. Without any vibration isolation, temporal stability setup found be around 0.011 rad. Compared with highly simple angle can easily adjusted...

Abstract Beams with spatially‐varying polarization states have been the topic of much interest recently due to unusual ways in which they can interact matter. Cylindrical vector beams (CVBs) represent most commonly used type and feature cylindrically‐symmetric distributions. The optical systems employed thus far for their generation usually only able produce a single CVB. To generate observe multiple CVBs, bulky stringent alignment tolerances needed. Here, method an array CVBs using element,...

In this work, a reflective polarization conversion metasurface (PCM) with symmetrical L-shaped patches is proposed which enables to switch between different modes by PIN diodes, i.e., linear-to-linear (LTL) cross-polarization and linear-to-circular (LTC) polarization. Because of multimodes activated in the structure, PCM shows an ultrawide bandwidth both for LTL LTC conversion. A microstrip line-based dc biasing network composed radial stubs introduced isolate RF currents, can resolve...

Abstract In photonic crystal systems, topologically protected edge states and corner can be achieved by breaking spatial inversion symmetry, which is expected to applied lasers, optical communication integrated photonics. However, designing ultrabroadband topological crystals still a challenge. this work, we propose valley composed of dendritic structures, realize transmission with relative bandwidth up 59.65%. Compared the previously reported two-dimensional broadband 32.02% bandwidth,...

We numerically investigate the polarization-dependent coupling in dual-core photonic crystal fibers (PCFs) selectively filled with gold wires air holes. It is shown that even and odd supermodes exhibit significantly different dispersion loss when one wire between two cores. The enhanced birefringence attenuation of support separation orthogonally polarized components as well transmissions a high degree polarization gold-filled dual core PCFs. Our study suggests PCF coupler new possibility...