Transitional Goos-Hänchen effect due to the topological phase transitions

Wu, Weijie; Zhang, Wenshuai; Chen, Shizhen; Ling, Xiaohui; Shu, Weixing; Luo, Hailu; Wen, Shuangchun; Yin, Xiaobo

doi:10.1364/oe.26.023705

Cited by 30 publications

(9 citation statements)

References 42 publications

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“…From Fresnel’s equations, the complex reflection coefficients can be expressed as for p and s polarizations in which represents the phase of both polarizations. According to the stationary phase approach [ 55 ], the lateral position shift represents the higher order mode of the phase signal [ 41 , 56 , 57 ] and can be determined through the following equation [ 58 ]: …”

Section: Experimental Methodsmentioning

confidence: 99%

“…) for p and s polarizations in which H -(1) represents the phase of both polarizations. According to the stationary phase approach [43], the lateral position shift the lateral position shift represents the higher order mode of the phase signal [32,44,45] and can be determined through the following equation [46]:…”

Section: Optimization Of the 2d Gst Thickness On The Plasmonic Sensin...mentioning

confidence: 99%

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Targeted Sub-Attomole Cancer Biomarker Detection Based on Phase Singularity 2D Nanomaterial-Enhanced Plasmonic Biosensor

et al. 2021

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Highlights A zero-reflection-induced phase singularity is achieved through precisely controlling the resonance characteristics using two-dimensional nanomaterials. An atomically thin nano-layer having a high absorption coefficient is exploited to enhance the zero-reflection dip, which has led to the subsequent phase singularity and thus a giant lateral position shift. We have improved the detection limit of low molecular weight molecules by more than three orders of magnitude compared to current state-of-art nanomaterial-enhanced plasmonic sensors. Abstract Detection of small cancer biomarkers with low molecular weight and a low concentration range has always been challenging yet urgent in many clinical applications such as diagnosing early-stage cancer, monitoring treatment and detecting relapse. Here, a highly enhanced plasmonic biosensor that can overcome this challenge is developed using atomically thin two-dimensional phase change nanomaterial. By precisely engineering the configuration with atomically thin materials, the phase singularity has been successfully achieved with a significantly enhanced lateral position shift effect. Based on our knowledge, it is the first experimental demonstration of a lateral position signal change > 340 μm at a sensing interface from all optical techniques. With this enhanced plasmonic effect, the detection limit has been experimentally demonstrated to be 10–15 mol L−1 for TNF-α cancer marker, which has been found in various human diseases including inflammatory diseases and different kinds of cancer. The as-reported novel integration of atomically thin Ge2Sb2Te5 with plasmonic substrate, which results in a phase singularity and thus a giant lateral position shift, enables the detection of cancer markers with low molecular weight at femtomolar level. These results will definitely hold promising potential in biomedical application and clinical diagnostics.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Optimization Of the 2d Gst Thickness On The Plasmonic Sensin...mentioning

confidence: 99%

Targeted Sub-Attomole Cancer Biomarker Detection Based on Phase Singularity 2D Nanomaterial-Enhanced Plasmonic Biosensor

et al. 2021

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“…Thus the emergence of photonic topological metacrystal render a important foundation to investigate photonic SHE at the unique optical interface. Unlike graphene [26][27][28] and silene [29], 3D photonic topological metacrystal are nonplanar and and possess intrinsic spin-orbit coupling that results in unique band structure. These structures, especially for Dirac points and Weyl points, exhibit unusual physical properties that cannot be found in either monolayers or in bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Giant photonic spin Hall effect near the Dirac points

Yang

et al. 2020

Phys. Rev. A

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The origin of spin-orbit interaction of light at a conventional optical interface lies in the transverse nature of the photon polarization: The polarizations associated with the plane-wave components experience slightly different rotations in order to satisfy the transversality after reflection or refraction. Recent advances in topological photonic materials provide crucial opportunities to reexamine the spin-orbit interaction of light at the unique optical interface. Here, we establish a general model to describe the spin-orbit interaction of light in the photonic Dirac metacrystal. We find a giant photonic spin Hall effect near the Dirac points when a Gaussian beam impinges at the interface of the photonic Dirac metacrystal. The giant photonic spin Hall effect is attribute to the strong spin-orbit interaction of light, which manifests itself as the large polarization rotations of different plane-wave components. We believe that these results may provide insight into the fundamental properties of the spin-orbit interaction of light in the topological photonic systems.

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“…al proposed an experimental scheme based on a prism-graphene coupling structure for MO tunable GH effect sensing [35,36]. Recently the GH shift on the surface of silicene [37], TMDCs [38] and Weyl semimetals [39] has also been investigated. From an application perspective, Farmani et.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optic modulation of lateral and angular shifts in spin-orbit coupled members of the graphene family

Shah

Anwar

2020

OSA Continuum

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The intrinsic spin-orbit coupling in the 2D staggered monolayer semiconductors is very large as compared to graphene. The large spin orbit interaction in these materials leads to the opening of a gap in the energy spectrum and spin-splitting of the bands in each valley. In this paper, we theoretically investigate the mechanical steering of beams from these spin-orbit rich, staggered 2D materials. Mechanical steering results in noticeable deviations of the reflected and transmitted ray profiles as predicted from classical laws of optics. These effects are generally called the Goos-Hanchen (GH) and Imbert-Fedorov shifts. We find that electric and magnetic field modulated giant spatial and angular GH shifts can be achieved in these materials for incident angles in the vicinity of Brewster angle in terahertz regime. We also determine the dependence of beam shifts on the chemical potential and find that the Brewster angle and the sign of GH shift can be controlled by varying the chemical potential. This allows the possibility of realizing spin and valley dependent optical effects that can be useful readout markers for experiments in quantum information processing, biosensing and valleytronics, employed in the terahertz regime.

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Transitional Goos-Hänchen effect due to the topological phase transitions

Cited by 30 publications

References 42 publications

Targeted Sub-Attomole Cancer Biomarker Detection Based on Phase Singularity 2D Nanomaterial-Enhanced Plasmonic Biosensor

Targeted Sub-Attomole Cancer Biomarker Detection Based on Phase Singularity 2D Nanomaterial-Enhanced Plasmonic Biosensor

Giant photonic spin Hall effect near the Dirac points

Magneto-optic modulation of lateral and angular shifts in spin-orbit coupled members of the graphene family

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