A numerical analysis of a novel birefringent photonic crystal fiber (PCF) biosensor\ud constructed on the surface plasmon resonance (SPR) model is presented in this paper.\ud This biosensor configuration utilizes circular air holes to introduce birefringence into\ud the structure. This PCF biosensor model shows promise in the area of multiple detection\ud using HEx\ud 11 and HEy\ud 11 modes to sense more than one analyte. A numerical study of the biosensor\ud is performed in two interrogation modes: amplitude and wavelength. Sensor resolution\ud values with spectral interrogation yielded 5 10 5 RIU (refractive index units) for\ud HEx\ud 11 modes and 6 10 5 RIU for HEy\ud 11 modes, whereas 3 10 5 RIU for HEx\ud 11 modes\ud and 4 10 5 RIU for HEy\ud 11 modes are demonstrated for the amplitude interrogation

This paper presents a theoretical investigation of a novel holey fiber (Photonic Crystal Fiber (PCF)) multi-channel biosensor based on surface plasmon resonance (SPR). The large gold coated micro fluidic channels and elliptical air hole design of our proposed biosensor aided by a high refractive index over layer in two channels enables operation in two modes; multi analyte sensing and self-referencing mode. Loss spectra, dispersion and detection capability of our proposed biosensor for the two fundamental modes (

We report the first demonstration of excitability in an all-fiber laser. We present clear experimental evidence in this passively Q -switched device with gain and absorber sections for defining properties of excitability, including a threshold-based excitable response and a decreasing reaction delay between input pulse and excitatory response with increasing perturbation amplitude. Our experimental results are consistent with the homoclinic/saddle-loop mechanism that forms the basis of excitability as demonstrated by a study of the Yamada model; they pave the way toward novel and reliable all-fiber architectures for neuro-inspired photonic memory and computing applications.

We consider self-pulsing in lasers with a gain section and an absorber section via a mechanism known as [Formula: see text]-switching, as described mathematically by the Yamada ordinary differential equation model for the gain, the absorber and the laser intensity. More specifically, we are interested in the case that gain and absorber decay on different time-scales. We present an overall bifurcation structure by showing how the two-parameter bifurcation diagram in the plane of pump strength versus decay rate of the gain changes with the ratio between the two decay rates. In total, there are ten cases BI to BX of qualitatively different two-parameter bifurcation diagrams, which we present with an explanation of the transitions between them. Moroever, we show for each of the associated eleven cases of structurally stable phase portraits (in open regions of the parameter space) a three-dimensional representation of the organization of phase space by the two-dimensional manifolds of saddle equilibria and saddle periodic orbits. The overall bifurcation structure provides a comprehensive picture of the observable dynamics, including multistability and excitability, which we expect to be of relevance for experimental work on [Formula: see text]-switching lasers with different kinds of saturable absorbers.