Giant Goos-Hanchen Shift Research Articles

Nonlinear dynamical control of the giant resonant Goos–Hanchen shift

An analytical approach is developed for the calculation of the dynamical Goos–Hanchen (GH) shift in a layered dielectric structure, which provides waveguiding of a high-quality-factor leaky eigenmode and lateral energy transfer. The analysis is based on the master equation for slow amplitude of the mode excited by impinging light, and it allows us to relate reflected and transmitted fields to the incident radiation in a general case of nonlinear and non-stationary processes. The corresponding numerical calculations demonstrate giant GH shifts for the reflected and transmitted beams. It is shown that the value and sign of the GH shift for the reflected and transmitted beams can be controlled by the incident field intensity and/or incident pulse duration.

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

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 (235.8λ) 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.

High-sensitivity Goos-Hanchen shift sensing based on Bloch surface wave

A novel and simple sensing scheme based on the giant Goos-Hanchen shift enhanced by the excitation of the Bloch surface wave in a truncated one-dimensional photonic crystal structure is proposed and experimentally demonstrated. The significantly enhanced Goos-Hanchen shift is directly measured by a position sensitive detector and the following amplifier. The bulk refractive index sensitivity of the sensor is investigated by utilizing sodium chloride solutions and glycerol solutions with different concentrations as test samples. The results show that the Goos-Hanchen shift sensor has a superior sensitivity of 2.0*10−9 RIU/nm, which outperforms the SPR enhanced Goos-Hanchen shift sensors.

Giant Goos-Hänchen Shifts in Polaritonic Materials Doped with Nanoparticles

We analyze the Goos-Hanchen (GH) shifts in polaritonic materials doped with nanoparticles inside a cavity. The effect of dipole-dipole interaction (DDI) has been used as an interesting phenomenon to investigating giant GH shifts in transmitted and reflected beams. It is found that the giant positive and negative GH shifts can be obtained simultaneously in transmitted and reflected light beams. Moreover, the group velocity of reflected and transmitted light beams has been discussed in details by analyzing the GH shifts in transmitted and reflected lights. Our proposed model opens up a new way for manipulating the GH shifts in polaritonic materials doped with nanoparticles.

Widely varying giant Goos–Hänchen shifts from Airy beams at nonlinear interfaces

We present a numerical study of the giant Goos-Hänchen shifts (GHSs) obtained from an Airy beam impinging on a nonlinear interface. To avoid any angular restriction associated with the paraxial approximation, the analysis is based on the nonlinear Helmholtz equation. We report the existence of nonstandard nonlinear GHSs displaying an extreme sensitivity to the input intensity and the existence of multiple critical values. These intermittent and oscillatory regimes can be explained in terms of competition between critical coupling to a surface mode and soliton emission from the refracted beam component and how this interplay varies with localization of the initial Airy beam.

Nearly three orders of magnitude enhancement of Goos-Hanchen shift by exciting Bloch surface wave

Goos-Hanchen effect is experimentally studied when the Bloch surface wave is excited in the forbidden band of a one-dimensional photonic band-gap structure. By tuning the refractive index of the cladding covering the truncated photonic crystal structure, either a guided or a surface mode can be excited. In the latter case, strong enhancement of the Goos-Hanchen shift induced by the Bloch-surface-wave results in sub-millimeter shifts of the reflected beam position. Such giant Goos-Hanchen shift, ~750 times of the wavelength, could enable many intriguing applications that had been less than feasible to implement before.