Critically coupled surface phonon-polariton excitation in silicon carbide

Neuner, Burton; Korobkin, Dmitriy; Fietz, Chris; Carole, Davy; Ferro, Gabriel; Shvets, Gennady

doi:10.1364/ol.34.002667

Cited by 59 publications

(54 citation statements)

References 12 publications

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“…However, we stress that interesting materials such as restrahlen crystals [66] exist in the mid-infrared region. We have also seen that many interesting concepts relating to linear and nonlinear metamaterials can be tested and implemented in the microwave region.…”

Section: Transformation Optics Across the Spectrummentioning

confidence: 86%

Metamaterials and metaoptics

et al. 2011

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T he idea of a new class of media that has unusual properties with respect to electromagnetic wave propagation is generally attributed to the Russian physicist Victor Veselago [1]. He considered what would be the consequences if one could create or find materials for which the dielectric permittivity ε and the magnetic permeability µ were both negative. He deduced that one striking outcome would be that the refractive index of the material would seem to be negative, causing the incident and refracted waves to lie on the same side of the normal to the interface between a 'standard' medium and the new medium. This phenomenon is now known as negative refraction (Figure 1(a)) and is associated with other phenomena in which the sign of the refractive index is reversed, such as Doppler shift, Cherenkov angle, Goos-Hänchen shift and radiation pressure. Another consequence of a negative refractive index is that the electric, magnetic and wave vectors form a left-handed triad, rather than the right-handed triad found in dielectrics. For this reason, such materials are called left-handed media, or sometimes double-negative media.If one considers the conservation of momentum at the interface between a standard material and a left-handed metamaterial in which negative refraction is occurring (Figure 1(b)), two viewpoints are valuable. In the first, the metamaterial is regarded as a continuous medium characterized by an optical refractive index (or perhaps a permittivity tensor), and thus conservation of momentum requires the index to be negative. In the second, the metamaterial is regarded as being composed of discrete elements (perhaps at the level of atoms or molecules, or larger) separated by a vacuum. This means that left-handed metamaterials must have an internal structure whose strong interaction provides momentum transfer parallel to the interface, and also in the correct direction, much as a diffraction grating or crystal can. Hence, we require a well-designed structured material to provide this new behavior, and it should be structured on a scale much finer than the wavelength of incident light if it is to be regarded as a new type of solid, rather than just a diffraction grating or stack of diffraction gratings.Related fields of science already exist in which structured materials are used to give desired optical properties. One of these is the study of composite materials, for which the most authoritative account may be found in a book by Milton [2]. This field dates back to Egyptian and Roman times, when different colors were given to glass by mixing chosen metallic particles into the glass matrix. Optical composite materials are generally used in the quasistatic limit, where the particle size is much finer than the wavelength of incident light. One can use electrostatics to calculate an effective dielectric permittivity or refractive index for the particle-matrix structure, and exploit the effective permittivity or We discuss the topics of metamaterials-electromagnetic composites offering simultaneous control of...

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Section: Transformation Optics Across the Spectrummentioning

confidence: 86%

Metamaterials and metaoptics

et al. 2011

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“…The two guided TM modes can be interpreted as a result of hybridization between two surface phonon-polaritons supported by the individual SiC/vacuum interfaces [25].…”

Section: Electromagnetic Properties Of the Swabsicmentioning

confidence: 99%

“…The quantity Q res determines the fill time of the structure according to T fill % ðQ res =2Þ! À1 if the following two simplifying assumptions are made: (i) beam-loading Q beam ¼ Q res , and (ii) the structure is critically coupled [25]. Based on the properties of the luminous L-modes, only modest values of Q res $ 500-1000 are expected, which translates into T fill $ 1:5 ps-3:0 ps.…”

Section: ðYþ ¼ Ementioning

confidence: 99%

Prism-coupled surface wave accelerator based on silicon carbide

Neuner

Korobkin

Ferro

et al. 2012

Phys. Rev. ST Accel. Beams

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A compact, solid-state accelerating structure based on surface waves is proposed and experimentally characterized. The structure, consisting of two SiC layers epitaxially grown on Si slabs and separated from each other by a subwavelength acceleration channel, is shown to support both longitudinal (accelerating) and transverse (deflecting) surface modes. Both modes are experimentally excited and characterized by performing angle-resolved spectroscopy with a wavelength-tunable carbon dioxide laser. Phase velocities of superluminous and subluminous modes are experimentally demonstrated, paving the way for tabletop charged particle acceleration. The same structure can be used for optical characterization of ultrashort electron bunches that generate longitudinal and transverse Cherenkov radiation.

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“…Surface phonon-polartions (SPPs) have been recently proposed [1][2][3] as potential energy carriers to enhance significantly the phonon heat transport in polar nanomaterials with low thermal conductivity, as is the case of the amorphous SiO 2 and crystalline SiC. Many theoretical [4][5][6][7] and experimental [8,9] studies have shown that the propagation length of SPPs traveling along the interface of nanofilms can be more than three orders of magnitude larger than the corresponding phonon mean free path, which yields in turn a SPP thermal conductivity comparable or higher than the phonon counterpart.…”

Section: Introductionmentioning

confidence: 99%

Fresnel-like formulas for the reflection and transmission of surface phonon-polaritons at a dielectric interface

et al. 2014

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The reflection and transmission coefficients of a surface phonon-polariton propagating along the surface of a thin film of SiO 2 and crossing the interface of two dielectric media are analytically determined. Based on the expansion of the electrical and magnetic fields in terms of normal modes, explicit expressions for the reflectivity and transmissivity of the radiation fields generated at the dielectric interface are also obtained. Symmetrical and simple Fresnel-like formulas are derived for nanofilms. For the dielectric interfaces of air/BaF 2 and air/Al 2 O 3 , it is shown that: i) The polariton reflectivity (transmissivity) decreases (increases) as the film thickness increases, while its radiation equivalent follows the opposite behavior. ii)In the polariton and radiation fields, the transmissivity is significantly more sensitive than the reflectivity to the changes on the permittivity mismatch of the dielectric interface. For a 143 nm-thick film, the polariton transmissivity (reflectivity) changes 13.2% (1.9%), when this mismatch varies by 50%. iii) The reflectivity and transmissivity of the radiation fields are smaller than their polariton counterparts, which together account for around 82% of the total energy. The proposed formalism accurately fulfils the principle of conservation of energy for describing the reflection and transmission of both the polariton and radiation fields generated at a dielectric interface.

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Critically coupled surface phonon-polariton excitation in silicon carbide

Cited by 59 publications

References 12 publications

Metamaterials and metaoptics

Metamaterials and metaoptics

Prism-coupled surface wave accelerator based on silicon carbide

Fresnel-like formulas for the reflection and transmission of surface phonon-polaritons at a dielectric interface

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