Resonance‐like Goos‐Hänchen shift induced by nano‐metal films

Institut für Integrierte Naturwissenschaften, Universität Koblenz, Universitätsstr. 1, 56070 Koblenz, Germany
Annalen der Physik (Impact Factor: 3.05). 08/2008; 17(12):917 - 921. DOI: 10.1002/andp.200810325
Source: arXiv


The influence of nano-metal films on the Goos-Haenchen shift (GHS) is investigated. The films deposited at the total reflecting surface of a perspex prism/air have a sheet resistance varying between Z = 25 and 3 000 Ohm. A resonance-like enhancement of the shift and of the absorption is found for TE polarized waves, when the sheet resistance approaches the value of the vacuum impedance. For TM waves the influence of the metal films on the GHS is comparatively weak. The experiments are carried out with microwaves. Keywords: Goos-Haenchen shift; nano-metallic films, microwaves PACS: 42.25.Bs, 42.25.Gy, 42.50.-p, 73.40.Gk Comment: 6 pages, 4 figures

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    ABSTRACT: In the thirties of the last century it was shown that nano-metal films have a frequency independent absorption in the far infrared regime and below. Moreover, the absorption A of these films is 0.5 and at the same time both reflection R and transmission T are 0.25, complying with the relation A + R + T = 1 at a sheet resistance Z□of 60 πΩ. The latter property of nano-metal films was shown by Woltersdorff in 1934. Multiple reflections between such films allow the design of low reflecting large scale absorbers for the wave length range from far infrared to low frequency radio waves. Experimental data of the novel absorber device measured in the GHz frequency range are presented. The electrical nano-metal film properties are also useful for applications in IR-photonics and IR-communication systems. The article presents a brief review of the historical studies on free carrier electromagnetic wave absorption and on novel applications.
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    ABSTRACT: Investigation on the phase shifts of higher-order reflected light from a two-dimensional photonic crystal (PC) demonstrates that the phase shift of − m th order reflected light is symmetric with respect to the line of k x = m π ∕ b in the frequency-wave vector domain, where k x and b denote the incident wave vector component along the surface and the period of the PC along the surface, respectively, and m is an integer. Such phase symmetry originates from the periodicity of a PC along the surface. When higher-order propagating waves appear between two band edges of a stop band, the phase change of the 0th order reflection is generally not π as reported before. Moreover, the reflection phase can be adjusted and designed by changing the cylinder radii of the surface layer. It provides a robust way to achieve a giant Goos–Hänchen shift, which is described in detail as an example, and superluminal propagation from a PC.
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    ABSTRACT: In recent years, the fantastic phenomena of negative Goos-H\"anchen shifts were studied in several optics experiments with the positive refractivity materials, which is predicted by many scientists through both classical physics or quantum physics theory. In order to verify the negative Goos-H\"anchen shifts phenomena, an experiment in microwave frequency was done with nano-metal-films on prism surface. Because using nano-metal-films enhances self-interference effect, not only were the negative Goos-H\"anchen shifts obtained, but also the giant Goos-H\"anchen shifts was appeared.
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