Diffraction Anomalies in Grating Spectrophotometers

Stewart, James E.; Gallaway, W. S.

doi:10.1364/ao.1.000421

Cited by 121 publications

(31 citation statements)

References 15 publications

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“…The two branches of poles`repel' each other; the branches do not cross. This phenomenon has already been observed for gratings [6,32] but, to our best knowledge, has not been observed in a structure of only two interfaces. Figure 8 also shows the complex zeros of R oo associated with each value of l= ¶ 0 .…”

Section: Con®guration: Uniaxial Crystal±metal±dielectricsupporting

confidence: 60%

Excitation of eigenmodes at uniaxial crystal-metal-isotropic films

Gigli

Depine

1998

Journal of Modern Optics

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We perform a theoretical study about the interaction between light and the eigenmodes of a metallic ®lm that separates a uniaxial crystal from an isotropic medium. These structures support two di erent eigenmodes: a surface mode at the isotropic medium±metal interface and another mode at the crystal±metal interface. We show that, contrary to what happens in isotropic con®gurations, these two modes can couple to incident radiation without corrugating the surface or adding another interface. We give conditions to obtain zero re¯ected power and a strong enhancement of the ®elds at both interfaces. We also show that, owing to the di erent characteristics of the modes supported by each interface, the relative position of their propagation constants in the complex plane can be selected rather arbitrarily by tuning the ®lm parameters. We give examples in which both couplings occur for angles of incidence either very di erent (separate resonances) or very close (almost double resonances). In the latter case we observe the phenomenon of`reluctance' between resonances.

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Section: Con®guration: Uniaxial Crystal±metal±dielectricsupporting

confidence: 60%

Excitation of eigenmodes at uniaxial crystal-metal-isotropic films

Gigli

Depine

1998

Journal of Modern Optics

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“…Diffraction of light by periodically one-dimensional (1D) corrugated surface has been a subject of continuing interest since the early days of the electromagnetic theory. [1][2][3][4] Recently, some of more interesting examples involve the coupling of light to metal surface, which can lead to what is known as enhanced or extraordinary optical transmission (EOT) due to the excitation of surface plasmons (SPs) in the subwavelength structured metal interface. 5,6 EOT of the metallic 1D gratings is particularly attractive at terahertz (THz) frequencies for developing high-contrast cut-off filters and high extinctionratio polarizers.…”

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confidence: 99%

Terahertz magnetic and electric Mie resonances of an all-dielectric one-dimensional grating

Yang

Cui

Geng

et al. 2015

Applied Physics Letters

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Resonantly enhanced Raman scattering in dielectric nanostructures has been recently proven to be an efficient tool for developing nanothermometry and experimental determination of their mode-composition. In this paper, we develop a rigorous analytical theory based on the Green's function approach to calculate the Raman emission from crystalline high-index dielectric nanoparticles. As an example, we consider silicon nanoparticles which have a strong Raman response due to active optical phonon modes. We relate enhancement of Raman signal emission to Purcell effect due to the excitation of Mie modes inside the nanoparticles. We also employ the numerical approach to the calculation of inelastic Raman emission in more sophisticated geometries, which do not allow a straightforward analytical form of the Green's function description. The Raman response from a silicon nanodisk has been analyzed within the proposed method, and the contribution of the various Mie modes has been revealed.

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“…Resonance anomalies occur after the orders become evanescent waves . It is then clear that the `repulsion' phenomenon observed by Stewart and Gallaway [8] was one concerning resonance anomalies, occurring as it did at wavelength values distinct from those at which the orders passed off together . Figure 3 of [2] shows experimental curves which indicate two resonance anomalies crossing without giving any evidence of repelling each other .…”

Section: The Merging Properties Of Resonance Anomaliesmentioning

confidence: 90%

“…Stewart and Gallaway [8] have reported practical observations which show a reluctance of anomalies to coincide at positions where the grazing orders, associated with each, pass off simultaneously ('repulsion of anomalies') . We should be precise about terminology in this matter .…”

Section: The Merging Properties Of Resonance Anomaliesmentioning

confidence: 99%

A Detailed Theoretical Study of the Anomalies of a Sinusoidal Diffraction Grating

McPhedran

Maystre

1974

Optica Acta: International Journal of Optics

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Theoretical counterparts are presented for the experimental efficiency curves obtained by Hutley and Bird in the visible region for a holographic grating covered consecutively with films of silver, aluminium and gold. It is thus shown that the recently developed formulation of Maystre, which takes into account the finite conductivity of the grating surface, gives results in quantitative agreement with experiment . This not only validates the theory, but also demonstrates that the difficulties associated with profile determination and oxide films, which have in the past led some experimenters to renounce the visible region and perform measurements on millimetre-wave gratings, are not in fact insuperable . It is also shown that only a theoretical model which takes into account groove depth effects can hope to predict accurately the locations of regions of enhanced energy absorption by gratings .

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Diffraction Anomalies in Grating Spectrophotometers

Cited by 121 publications

References 15 publications

Excitation of eigenmodes at uniaxial crystal-metal-isotropic films

Excitation of eigenmodes at uniaxial crystal-metal-isotropic films

Terahertz magnetic and electric Mie resonances of an all-dielectric one-dimensional grating

A Detailed Theoretical Study of the Anomalies of a Sinusoidal Diffraction Grating

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