It is demonstrated that offshore wavenumbers of edge waves change from imaginary wavenumbers in deep water to real wavenumbers in shallow water. This finding indicates that edge waves in the offshore direction exist a...It is demonstrated that offshore wavenumbers of edge waves change from imaginary wavenumbers in deep water to real wavenumbers in shallow water. This finding indicates that edge waves in the offshore direction exist as evanescent waves in deep water and as propagating waves in shallow water. Since evanescent waves can stably exist in a limited region while propagating waves cannot, energy should be released from nearshore regions. In the present study, the instability region is predicted based on both the full water wave solution and the shallow-water wave approximation.展开更多
Thermal radiation TM polarization characteristics of a negative refractive index thin film was studied based on the transmit matrix method and Kirchhoff radiation law. The influence of the thin film pa- rameters on th...Thermal radiation TM polarization characteristics of a negative refractive index thin film was studied based on the transmit matrix method and Kirchhoff radiation law. The influence of the thin film pa- rameters on the thermal radiation directional characteristics and spectral property were discussed. And the influence of the evanescent waves was also discussed. The results show that two factors play important roles in the thermal radiation of negative index thin film: one is the interference effect of the thin film structure to the electromagnetic waves; the other is the photon tunneling effect of the negative refractive index material, which was caused by the amplifying evanescent wave. These indicate that spectral and directional characteristics of the thermal emissivity can be modulated by modifying the structure and the physics parameters of the negative refraction index thin film.展开更多
In the present study, we have theoretically modelled a surface plasmon resonance （SPR） based sensing chip utilizing a prism made up of gallium phosphidee. It has been found in the study that a large range of refract...In the present study, we have theoretically modelled a surface plasmon resonance （SPR） based sensing chip utilizing a prism made up of gallium phosphidee. It has been found in the study that a large range of refractive index starting from the gaseous medium to highly concentrated liquids can be sensed by using a single chip in the visible region of the spectrum. The variation of the sensitivity as well as detection accuracy with sensing region refractive index has been analyzed in detail. The large value of the sensitivity along with the large dynamic range is the advantageous feature of the present sensing probe.展开更多
A discrete model of the Differential Evanescent Light Intensity (DELI) technique was developed to calculate and map 3D nanolayers thicknesses from the evanescent light intensity captured from optical waveguides. The m...A discrete model of the Differential Evanescent Light Intensity (DELI) technique was developed to calculate and map 3D nanolayers thicknesses from the evanescent light intensity captured from optical waveguides. The model was used for ultra-thin Pd nanometric layers sputtered on glass substrates. The layers thickness profiles were displayed in 3D and 1D profiles plots. The total thickness profiles of the ultra-thin Pd films obtained in the range of 1-10 nm were validated using AFM measurements. Based on the model developed the evanescent photon extraction parameter of the material was estimated.展开更多
基金financially supported by the National Natural Science Foundation of China (Grant No. 51209081)China Postdoctoral Science Foundation (Grant No. 2012M511191)+3 种基金the Qinglan Project and 333 Project of Jiangsu Province (Grant No. BRA2012130)the National Key Basic Research Development Program of China (973 Program, Grant No. 2010CB429002)the 111 Project (Grant No. B12032)the Basic Research Funds for the Central Universities (Hohai University 2012B06514)
文摘It is demonstrated that offshore wavenumbers of edge waves change from imaginary wavenumbers in deep water to real wavenumbers in shallow water. This finding indicates that edge waves in the offshore direction exist as evanescent waves in deep water and as propagating waves in shallow water. Since evanescent waves can stably exist in a limited region while propagating waves cannot, energy should be released from nearshore regions. In the present study, the instability region is predicted based on both the full water wave solution and the shallow-water wave approximation.
基金Supported by the National Natural Science Foundation of China (Grant No. 50606003)Aeronautic Science Foundation of China (Grant No. 2007ZA51006)
文摘Thermal radiation TM polarization characteristics of a negative refractive index thin film was studied based on the transmit matrix method and Kirchhoff radiation law. The influence of the thin film pa- rameters on the thermal radiation directional characteristics and spectral property were discussed. And the influence of the evanescent waves was also discussed. The results show that two factors play important roles in the thermal radiation of negative index thin film: one is the interference effect of the thin film structure to the electromagnetic waves; the other is the photon tunneling effect of the negative refractive index material, which was caused by the amplifying evanescent wave. These indicate that spectral and directional characteristics of the thermal emissivity can be modulated by modifying the structure and the physics parameters of the negative refraction index thin film.
文摘In the present study, we have theoretically modelled a surface plasmon resonance （SPR） based sensing chip utilizing a prism made up of gallium phosphidee. It has been found in the study that a large range of refractive index starting from the gaseous medium to highly concentrated liquids can be sensed by using a single chip in the visible region of the spectrum. The variation of the sensitivity as well as detection accuracy with sensing region refractive index has been analyzed in detail. The large value of the sensitivity along with the large dynamic range is the advantageous feature of the present sensing probe.
文摘A discrete model of the Differential Evanescent Light Intensity (DELI) technique was developed to calculate and map 3D nanolayers thicknesses from the evanescent light intensity captured from optical waveguides. The model was used for ultra-thin Pd nanometric layers sputtered on glass substrates. The layers thickness profiles were displayed in 3D and 1D profiles plots. The total thickness profiles of the ultra-thin Pd films obtained in the range of 1-10 nm were validated using AFM measurements. Based on the model developed the evanescent photon extraction parameter of the material was estimated.
