We present new types of solitary wave solutions for the higher order nonlinear Schr\"odinger (HNLS) equation describing propagation femtosecond light pulses in an optical fiber under certain parametric conditions. Unlike reported HNLS equation, novel ones can describe bright and dark properties same expressions their amplitude may approach nonzero when time variable approaches infinity. In addition, such cannot exist equation. Furthermore, we investigate stability these waves some initial...

In this paper, unique surface sensing property and enhanced sensitivity in microring resonator biosensors based on subwavelength grating (SWG) waveguides are studied demonstrated. The SWG structure consists of periodic silicon pillars the propagation direction with a period. Effective region includes not only top side waveguide, but also space between light path. It leads to greatly increased contrast common evanescent wave sensors: remains constantly high as layer thickness grows. Microring...

We experimentally demonstrate a label-free sensor based on nanoslotted parallel quadrabeam photonic crystal cavity (NPQC). The NPQC possesses both high sensitivity and Q-factor. achieved (S) of 451 nm/refractive index unit Q-factor >7000 in water at telecom wavelength range, featuring figure merit >2000, an order magnitude improvement over the previous sensors. In addition, we measured streptavidin-biotin binding affinity detected 10 ag/mL concentrated streptavidin phosphate...

Compared to the conventional strip waveguide microring resonators, subwavelength grating (SWG) resonators have better sensitivity and lower detection limit due enhanced photon-analyte interaction. As sensors, especially biosensors, are usually used in absorptive ambient environment, it is very challenging further improve of SWG ring resonator by simply increasing sensitivity. The high resulted from larger mode-analyte overlap also brings significant absorption loss, which deteriorates...

We present nanoscale photonic crystal sensor arrays (NPhCSAs) on monolithic substrates. The NPhCSAs can be used as an opto-fluidic architecture for performing highly parallel, label-free detection of biochemical interactions in aqueous environments. consists lattice-shifted resonant cavities side-coupled to a single PhC waveguide. Each cavity has slightly different spacing and is shown independently shift its peak (a narrow drop) response the changes refractive index. extinction ratio...

We propose a novel optical sensor based on one-dimensional (1D) photonic crystal (PhC) single nanobeam air-mode cavity (SNAC). The performance of the device is investigated theoretically. By introducing quadratically modulated width tapering structure, waveguide-coupled 1D-PhC SNAC with calculated high quality factor 5.16×10(6) and an effective mode volume V(eff)∼2.18(λ/n(si))(3) can be achieved. For air mentioned above, light field strongly localized inside region (low index) overlaps...

Flatband slow light in a ring-shape-hole photonic crystal waveguide (RPCW) has been theoretically investigated. Numerical results show that both the outer and inner radii of first two rows holes adjacent to defect have much affect on properties. Therefore, by appropriately modifying ring-shaped holes, property is successfully optimized. Then we further enlarge flat bandwidth introducing oblique structure. The negligible dispersion bandwidths ranging from 3.57 24.67 nm for group indexes 28...

Two methods in terms of bandwidth broadening are proposed and compared for monopole slot ultrawideband (UWB) antennas supporting mobile terminal applications. The original antenna has a 9.27 GHz (1.73-11 GHz) that covers PCS1900, UMTS2000, TD-SCDMA, WLAN 802.11b/g or Bluetooth, LTE, WiMAX, UWB frequency range. In this letter, by cutting two new slots on the ground plane, can expand its to 9.33 (1.67-11 is available at extra DVB-H, DCS1800 services. Meanwhile, with conventional mushroom-type...

We propose and validate a complex-valued multilevel artificial neural network nonlinear equalizer (ANN-NLE) for single-carrier 16QAM 64QAM signals transmissions in the 60-GHz radio-over-fiber (RoF) transmission system. First, we analyze nonlinearities fiber-wireless channels. Then, introduce principles of ANN-NLE proposed millimeter-wave RoF systems. From analysis optical channel, it is essential to design mitigate cross-modulation (XM) effects between in-phase (I) quadrature-phase (Q)...

Sensitivities (S) and quality factors (Q) have been trade-offs in label-free optical resonator sensors, optimal geometry that maximizes both is under active development. In this paper, we demonstrate the nanoslotted parallel multibeam cavity possesses unexplored high S Q. We achieve S>800 nm/RIU (refractive index unit) Q>107 liquid at telecom wavelength range when absorption neglected. To best of our knowledge, first features Q factors, thus potentially an ideal platform for refractive...

We report the design of one dimensional photonic crystal nanobeam cavities with elliptical holes that is fully encapsulated in water environment and can confine light low index region. The proposed structure, based on principle gentle confinement electromagnetic field, designed by tapering width host waveguide away from center cavity while keeping other parameters constant. With elliptical-hole low-index mode tapered widths, through three finite-difference time-domain simulations, large...

We present a novel optical sensor based on the design of ultrahigh-Q and low-mode-volume 1-D single photonic crystal (PhC) slot nanobeam cavity (SNC) in which air-hole radius is parabolically tapered. The performance device investigated theoretically. In order to achieve high Q-factor sensitivity simultaneously, geometry exploited make field strongly localized inside low index region overlaps sufficiently with analytes. With three-dimensional finite-difference time-domain (3D-FDTD) method,...

We theoretically investigate a flexible design of building nanoscale photonic crystal (PhC) integrated sensor array with low crosstalk. The proposed device consists side-coupled PhC resonant cavities high Q-factors over 2 ×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . extinction ratio well-defined single resonance exceeds 30 dB. Each cavity has different wavelengths and independently shifts its in response to the refractive index...

This paper proposes a novel frequency-shifted interferometry (FSI) fiber cavity ring-down (CRD) gas sensing with dual-wavelength differential optical absorption that requires no modulation to continuous-wave source or without fast detection and switching electronics. The is constructed from standard components include micro-optical cell. FSI-CRD experiments are carried out two wavelengths at 1531.770 1532.000 nm. technique successfully by measuring acetylene-nitrogen mixtures acetylene...

We investigate nanocavities in deterministic aperiodic photonic crystal (PhC) nanobeams. reveal that even a single nanocavity can support multiple mode-matched resonances, which show an almost perfect field overlap the cavity region. The unique property is enabled by existence of adjustable bandgaps PhC Our investigation may inspire related studies on low threshold lasers, integrated nonlinear devices, optical filters, and on-chip sensors.

Ultrashort laser pulse propagation in a generalized nonconservative system is considered. Slopes appearing the form of third-order time derivative for narrow widths, nonlinear dispersion, and self-frequency shift arising from stimulated Raman scattering are taken into account. An exact analytical solitonlike solution presented femtosecond solitary pulse. The stability latter has been shown numerically by applying perturbations amplitude chirp, as well adding white noise. results indicate...

We demonstrate refractive index sensing using parallel tapered nano-slotted photonic-crystal nano-beam cavities with three-dimensional (3D) finite-difference time-domain (3D-FDTD) simulation. The electric field of the cavity mode is strongly concentrated in slot region leading to a large light–matter overlap, which expected add significant contribution sensitivity, and thus we present high refractive-index sensitivity more than 600 nm/refractive units. Additionally, quality (Q)-factor...