Both large positive and negative lateral shifts were observed for the reflected light beam on a symmetrical metal-cladding waveguide. The positive and negative shifts approach about 480 and 180 μm, respectively, which to our knowledge are the largest experimental results ever reported. The experiment also proves that the positive or the negative shift depends on sign of the difference between the intrinsic and radiative damping.

Observation of large positive and negative lateral shifts of a reflected beam from symmetrical metal-cladding waveguides

We report an experiment showing the submillimeter Imbert-Fedorov shift from the ultrastrong spin-orbital angular momentum coupling, which is a photonic version of the spin Hall effect, by measuring the reflection of light from the surface of a birefringent symmetrical metal cladding planar waveguide. The light incidents at a near-normal incident angle and excites resonant ultrahigh-order modes inside the waveguide. A 0.16-mm displacement of separated reflected light spots corresponding to two polarization states is distinguishable by human eyes. In our experiment, we demonstrate the control of polarizations of light and the direct observation of the spin Hall effect of light, which opens an important avenue towards potential applications for optical sensing and quantum information processing, where the spin nature of photons exhibits key features.

Direct Visualizing the Spin Hall Effect of Light via Ultrahigh-Order Modes.

A novel optical sensor for label-free biomolecular binding assay using a one-dimensional photonic crystal in a total-internal-reflection geometry is proposed and demonstrated. The simple configuration provides a narrow optical resonance to enable sensitive measurements of molecular binding, and at the same time employs an open interface to enable real-time measurements of binding dynamics. Ultrathin aminopropyltriethoxysilane/ glutaraldehyde films adsorbed on the interface were detected by measuring the spectral shift of the photonic crystal resonance and the intensity ratio change in a differential reflectance measurement. A detection limit of 6 x 10(-5) nm for molecular layer thickness was obtained, which corresponds to a detection limit for analyte adsorption of 0.06 pg/mm(2) or a refractive index resolution of 3 x 10(-8) RIU; this represents a significant improvement relative to state-of-the-art surface-plasmon-resonance-based systems.

/pdf/sensitive-molecular-binding-assay-using-a-photonic-crystal-3rdisgbjeq.pdf

Sensitive molecular binding assay using a photonic crystal structure in total internal reflection.

Surface plasmon resonance (SPR) with two-dimensional (2D) materials has been proposed to enhance the sensitivity of biosensors Here, we will apply SPR to greatly enhance and control the Goos-Hanchen (GH) shift It is theoretically shown that the GH shifts can be significantly enhanced in the SPR structure coated with a graphene-MoS2 heterostructure By changing the layer number of graphene or MoS2, the giant GH shifts can be obtained Maximum GH shift (2358λ) can be obtained when 2 layers of MoS2 and 3 layers of graphene are combined Moreover, the GH shift can be positive or negative depending on the layer number of MoS2 and graphene When the GH shift is used as the interrogation for the biosensor, it has a superior sensitivity By comparing the sensitivity based on the SPR with only Au coating or Au-graphene coating, the sensitivity of the GH shift-interrogated biosensor can be enhanced by nearly 300 times, and hence paves the way for further applications in fundamental biological studies and environmental monitoring

Giant and controllable Goos-Hänchen shifts based on surface plasmon resonance with graphene-MoS2 heterostructure

The giant Goos–Hanchen shift on a long-range surface plasmon (LRSP) configuration is examined theoretically. This lateral shift at the resonance of the LRSP can be two orders of magnitude greater than a wavelength. The analytical formulas of the radiative damping and the intrinsic damping of the LRSP are derived. It is found that the thicknesses of the second medium and the metal film determine the radiative damping and the intrinsic damping is illuminated by the imaginary part of the dielectric constant of the metal. Negative lateral beam shift occurs when the intrinsic damping is larger than the radiative damping. The theoretical results show good agreement with the predictions of the formulas.

https://iopscience.iop.org/article/10.1088/2040-8978/13/3/035002/pdf

Mechanism of giant Goos-Hänchen effect enhanced by long-range surface plasmon excitation

An oscillating wave sensor based on Fabry-Perot resonance modes has been developed. Different from the surface plasmon resonance sensors and the waveguide mode sensors in which the sample is located in the evanescent field region, the proposed device contains the sample in the core region that supports the oscillating field. Owing to the strong concentration of the electromagnetic field in the sensing medium, the proposed device exhibits unusual sensitivity enhancement, which has never been exploited in any other devices.

Optical sensor based on Fabry-Perot resonance modes

The light waveguide parameter measurer in the fields of waveguide optics and optoelectonics includes collimation laser, polarizer, beam splitter, eyelet, double-angle turntable, measuring detector, focusing lens, autocollimating detector, adjusting rack, optical plate, electric control box and computer. The measuring detector and the autocollimating detector are connected to the electric control box and the computer via data bus. The present invention can measure the refractivity and thickness of film material, refractivity contour, transmission loss and other parameters of light waveguide, and has wide measurement range, raised measurement precision, simple operation, high measurement speed, friendly interface and other features.

Light waveguide parameter measurer

In this paper we propose a novel design of prism-based device as a Fabry-Perot resonance mode sensor. In this setup, liquid or gaseous sample to be probed acts as a core of the F-P device, in which supporting oscillating field, rather than evanescent field. Owing to the strong concentration of the electromagnetic field in the sensing medium, which is about an order of magnitude higher than that in typical evanescent field sensors using SPR, the proposed device exhibits unusual optical properties. It is shown that the fundamental limitation of device sensitivity is set by beam divergence of the laser.

Optical chemical sensor based on Fabry-Perot resonance modes

In this paper, the lateral beam shift in a prism-waveguide coupling system at wavelengths ranging from visible to near infrared is theoretically examined. A simple theoretical formula is derived to analyze the behavior of the beam shift. We demonstrate that large positive and negative lateral optical beam shifts can be obtained when guided modes are excited. It is also found that the magnitude of the beam shift is closely related to the intrinsic and radiative damping. When the intrinsic damping is larger than the radiative damping, negative lateral beam shift occurs. Numerical calculations confirm the theoretical analysis and show that a beam shift of the order of millimeters is possible.

Large positive and negative lateral optical beam shift in prism-waveguide coupling system.

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Optical sensor based on Fabry-Perot resonance modes

Light waveguide parameter measurer

Optical chemical sensor based on Fabry-Perot resonance modes

Large positive and negative lateral optical beam shift in prism-waveguide coupling system.