Chapter 12 Semiconductor Nanophotonics Using Surface Polaritons

Folland, Thomas G.; Caldwell, Joshua D.

doi:10.1007/978-94-024-1544-5_12

Cited by 2 publications

(4 citation statements)

References 90 publications

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“…12,18,19 One of the most important technological hurdles for the implementation of SPhPs in nanophotonic and metamaterial technologies is that once a polar material is chosen, the spectral characteristics of the SPhPs it supports are fixed. 20 While there are many polar materials that occur in nature featuring Reststrahlen bands that combine to cover the entire MIR to THz spectral domain, 21 any given material will only support SPhPs within its own relatively narrow specific band. Here, we experimentally demonstrate an approach for broadening the spectral range of the SPhPs by using atomic-scale superlattices (SLs) composed of commercially established polar semiconductors.…”

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Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures

et al. 2019

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Surface phonon polaritons (SPhPs), the surface-bound electromagnetic modes of a polar material resulting from the coupling of light with optic phonons, offer immense technological opportunities for nanophotonics in the infrared (IR) spectral region. However, once a particular material is chosen, the SPhP characteristics are fixed by the spectral positions of the optic phonon frequencies. Here, we provide a demonstration of how the frequency of these optic phonons can be altered by employing atomic-scale superlattices (SLs) of polar semiconductors using AlN/GaN SLs as an example. Using second harmonic generation (SHG) spectroscopy, we show that the optic phonon frequencies of the SLs exhibit a strong dependence on the layer thicknesses of the constituent materials. Furthermore, new vibrational modes emerge that are confined to the layers, while others are centered at the AlN/GaN interfaces. As the IR dielectric function is governed by the optic phonon behavior in polar materials, controlling the optic phonons provides a means to induce and potentially design a dielectric function distinct from the constituent materials and from the effective-medium approximation of the SL. We show that atomic-scale AlN/GaN SLs instead have multiple Reststrahlen bands featuring spectral regions that exhibit either normal or extreme hyperbolic dispersion with both positive and negative permittivities dispersing rapidly with frequency. Apart from the ability to engineer the SPhP properties, SL structures may also lead to multifunctional devices that combine the mechanical, electrical, thermal, or optoelectronic functionality of the constituent layers. We propose that this effort is another step toward realizing user-defined, actively tunable IR optics and sources.

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Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures

et al. 2019

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“…The permittivity response of polar insulators inside the reststrahlen band is akin to that of metals in the visible range, and thus enables high reflectivity and evanescent fields to support propagating polaritons similar to SPPs. These polaritons are referred to as surface phonon polaritons (SPhPs) . The permittivity of polar insulators can be derived from the bonded oscillator model (Equation ) and is usually expressed using the “TOLO” formalism

ε (ω) = ε_{\infty} \frac{ω_{LO}^{2} - ω^{2} - i γ ω}{ω_{TO}^{2} - ω^{2} - i γ ω}

…”

Section: From Plasmonics To Polaritonicsmentioning

confidence: 99%

Section: From Plasmonics To Polaritonicsmentioning

confidence: 99%

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Phonon Polaritons and Hyperbolic Response in van der Waals Materials

Shen

Qiu

et al. 2019

Advanced Optical Materials

107

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Phonon polaritons provide useful opportunities, complementary to those provided by plasmon polaritons, in the study of the interaction of light with matter at small scales. The focus of this review is on phonon polaritons in low‐dimensional van der Waals (vdW) materials and heterostructures. Phonon polaritons confined in vdW materials exhibit large electromagnetic localization and are easy to hybridize with other collective modes. The extreme optical anisotropy in vdW systems produces the natural hyperbolic dispersion, enabling the access to deep subdiffractional optics and often yielding improved figures of merit over hyperbolic metamaterials. These virtues hold promises for practical nanophotonic applications, including optical sensing, super‐resolution imaging, energy and emission engineering, quantum optics, and a next generation of optical circuit elements.

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Chapter 12 Semiconductor Nanophotonics Using Surface Polaritons

Cited by 2 publications

References 90 publications

Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures

Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures

Phonon Polaritons and Hyperbolic Response in van der Waals Materials

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