Abstract
The field of nanophotonics focuses on the ability to confine light to nanoscale dimensions, typically much smaller than the wavelength of light. The goal is to develop light-based technologies that are impossible with traditional optics. Subdiffractional confinement can be achieved using either surface plasmon polaritons (SPPs) or surface phonon polaritons (SPhPs). SPPs can provide a gate-tunable, broad-bandwidth response, but suffer from high optical losses; whereas SPhPs offer a relatively low-loss, crystal-dependent optical response, but only over a narrow spectral range, with limited opportunities for active tunability. Here, motivated by the recent results from monolayer graphene and multilayer hexagonal boron nitride heterostructures, we discuss the potential of electromagnetic hybrids — materials incorporating mixtures of SPPs and SPhPs — for overcoming the limitations of the individual polaritons. Furthermore, we also propose a new type of atomic-scale hybrid the crystalline hybrid — where mixtures of two or more atomic-scale (∼3 nm or less) polar dielectric materials lead to the creation of a new material resulting from hybridized optic phonon behaviour of the constituents, potentially allowing direct control over the dielectric function. These atomic-scale hybrids expand the toolkit of materials for mid-infrared to terahertz nanophotonics and could enable the creation of novel actively tunable, yet low-loss optics at the nanoscale.
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References
Ritchie, R. H. Plasma losses by fast electrons in thin films. Phys. Rev. Lett. 106, 874–881 (1957).
Ruppin, R. & Englman, R. Optical phonons of small crystals. Rep. Prog. Phys. 33, 149–196 (1970).
West, P. R. et al. Searching for better plasmonic materials. Laser Photon. Rev. 4, 795–808 (2010).
Naik, G. V. et al. Titanium nitride as a plasmonic material for visible and near-infrared wavelengths. Opt. Mater. Express 2, 478–489 (2012).
Andress, W. F. et al. Ultra-subwavelength two-dimensional plasmonic circuits. Nano Lett. 12, 2272–2277 (2012).
Law, S., Adams, D. C., Taylor, A. M. & Wasserman, D. Mid-infrared designer materials. Opt. Express 20, 12155–12165 (2012).
Sachet, E. et al. Dysprosium-doped cadmium oxide as a gateway material for mid-infrared plasmonics. Nature Mater. 14, 414–420 (2015).
Saxena, H., Peale, R. E. & Buchwald, W. R. Tunable two-dimensional plasmon resonances in an InGaAs/InP high electron mobility transistor. J. Appl. Phys. 105, 113101 (2009).
Chen, J. et al. Optical nano-imaging of gate-tunable graphene plasmons. Nature 487, 77–81 (2012).
Fei, Z. et al. Gate-tuning of graphene plasmons revealed by infrared nano-imaging. Nature 487, 82–85 (2012).
Fang, Z. et al. Gated tunability and hybridization of localized plasmons in nanostructured graphene. ACS Nano 7, 2388–2395 (2013).
Muravjov, A. V. et al. Temperature dependence of plasmonic terahertz absorption in grating-gate gallium-nitride transistor structures. Appl. Phys. Lett. 96, 042105 (2010).
Grigorenko, A. N., Polini, M. & Novoselov, K. S. Graphene plasmonics. Nature Photon. 6, 749–758 (2012).
Brar, V. W. et al. Hybrid surface-phonon-plasmon polariton modes in graphene/monolayer h-BN heterostructures. Nano Lett. 14, 3876–3880 (2014).
Dai, S. et al. Graphene on hexagonal boron nitride as a tunable hyperbolic metamaterial. Nature Nanotech. 10, 682–686 (2015). This paper reports the first experimental demonstration of SPP–HPhP coupling using a graphene/hBN electromagnetic hybrid.
Woessner, A. et al. Highly confined low-loss plasmons in graphene–boron nitride heterostructures. Nature Mater. 14, 421–425 (2014). This paper predicts the dispersion relationship of coupled SPP–HPhP modes within a graphene/hBN electromagnetic hybrid.
Khurgin, J. B. How to deal with the loss in plasmonics and metamaterials. Nature Nanotech. 10, 1–5 (2014).
Khurgin, J. B. & Sun, G. Scaling of losses with size and wavelength in nanoplasmonics and metamaterials. Appl. Phys. Lett. 99, 211106 (2011).
Scharte, M. et al. Do Mie plasmons have a longer lifetime on resonance than off resonance? Appl. Phys. B 73, 305–310 (2001).
Caldwell, J. D. et al. Low-loss, infrared and terahertz nanophotonics with surface phonon polaritons. Nanophotonics 4, 44–68 (2015). This review discusses the relationship between SPhP response and the properties of the polar crystal, and areas where SPhPs can advance the state of the art.
Hillenbrand, R., Taubner, T. & Keilmann, F. Phonon-enhanced light–matter interaction at the nanometre scale. Nature 418, 159–162 (2002).
Greffet, J.-J. et al. Coherent emission of light by thermal sources. Nature 416, 61–64 (2002).
Caldwell, J. D. et al. Low-loss, extreme sub-diffraction photon confinement via silicon carbide surface phonon polariton nanopillar resonators. Nano Lett. 13, 3690–3697 (2013).
Caldwell, J. D. et al. Sub-diffractional, volume-confined polaritons in the natural hyperbolic material hexagonal boron nitride. Nature Commun. 5, 5221 (2014).
Chen, Y. et al. Spectral tuning of localized surface phonon polariton resonators for low-loss mid-IR applications. ACS Photon. 1, 718–724 (2014).
Wang, T. et al. Optical properties of single infrared resonant circular microcavities for surface phonon polaritons. Nano Lett. 13, 5051–5055 (2013).
Dai, S. et al. Tunable phonon polaritons in atomically thin van der Waals crystals of boron nitride. Science 343, 1125–1129 (2014).
Hyun, B.-R. et al. Far-infrared absorption of PbSe nanorods. Nano Lett. 11, 2786–2790 (2011).
Dai, S. et al. Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material. Nature Commun. 6, 6963 (2015).
Li, P. et al. Hyperbolic phonon–polaritons in boron nitride for near-field optical imaging. Nature Commun. 6, 7507 (2015).
Yoxall, E. et al. Direct observation of ultraslow hyperbolic polariton propagation with negative phase velocity. Nature Photon. 9, 674–678 (2015). This paper presents the experimental demonstration of the negative phase velocity within the hyperbolic upper Reststrahlen band of hBN and directly correlates the SPhP lifetime to that of the intrinsic optic phonons.
Jia, Y. et al. Tunable plasmon-phonon polaritons in layered graphene-hexagonal boron nitride heterostructures. ACS Photon. 2, 907–912 (2015).
Barcelos, I. D. et al. Graphene/h-BN plasmon-phonon coupling and plasmon delocalization observed by infrared nano-spectroscopy. Nanoscale 7, 11620–11625 (2015).
Kumar, A. et al. Tunable light-matter interaction and the role of hyperbolicity in graphene-hBN system. Nano Lett. 15, 3172–3180 (2015).
Caldwell, J. D. & Novoselov, K. S. Van der Waals heterostructures: mid-infrared nanophotonics. Nature Mater. 14, 364–366 (2015).
Farmer, D. B., Rodrigo, D., Low, T. & Avouris, P. Plasmon-plasmon hybridization and bandwidth enhancement in nanostructured graphene. Nano Lett. 15, 2582–2587 (2015).
Stinson, H. T. et al. Infrared nanospectroscopy and imaging of collective superfluid excitations in anisotropic superconductors. Phys. Rev. B 90, 014502 (2014).
Keeling, J., Eastham, P. R., Szymanska, M. H. & Littlewood, P. B. BCS-BEC crossover in a system of microcavity polaritons. Phys. Rev. B 72, 115320 (2005).
Byrnes, T., Kim, N. Y. & Yamamoto, Y. Exciton–polariton condensates. Nature Photon. 10, 803–813 (2014).
Tiwald, T. E. et al. Carrier concentration and lattice absorption in bulk and epitaxial silicon carbide determined using infrared ellipsometry. Phys. Rev. B 60, 11464–11474 (1999).
Nagai, M., Ohkawa, K. & Kuwata-Gonokami, M. Mid-infrared pump-probe reflection spectroscopy of the coupled phonon-plasmon mode in GaN. Appl. Phys. Lett. 81, 484–486 (2002).
Harima, H., Nakashima, S.-i. & Uemura, T. Raman scattering from anisotropic LO-phonon-plasmon-coupled mode in n-type 4H- and 6H-SiC. J. Appl. Phys. 78, 1996–2005 (1995).
Spann, B. T. et al. Photoinduced tunability of the Reststrahlen band in 4H-SiC. Preprint at http://arXiv.org/abs/1511.09428 (2015).
Hwang, E. H., Sensarma, R. & Das Sarma, S. Plasmon-phonon coupling in graphene. Phys. Rev. B 82, 195406 (2010). This paper predicts the anti-crossing behaviour observed within the dispersion of graphene SPPs due to the interference with surface optic phonons on the underlying polar substrate.
Fei, Z. et al. Infrared nanoscopy of Dirac plasmons at the graphene-SiO2 interface. Nano Lett. 11, 4701–4705 (2011).
Koch, R. J., Seyller, T. & Schaefer, J. A. Strong phonon-plasmon coupled modes in the graphene/silicon carbide heterosystem. Phys. Rev. B 82, 201413(R) (2010).
Cortes, C. L., Newman, W., Molesky, S. & Jacob, Z. Quantum nanophotonics using hyperbolic metamaterials. J. Opt. 14, 063001 (2012).
Esslinger, M. et al. Tetradymites as natural hyperbolic materials for the near-infrared to visible. ACS Photon. 1, 1285–1289 (2014).
Wang, Y. et al. Plasmon resonances of highly doped two-dimensional MoS2 . Nano Lett. 15, 883–890 (2015).
Li, P. & Taubner, T. Multi-wavelength superlensing with layered phonon-resonant dielectrics. Opt. Express 20, A11787 (2012).
Balandin, A. A. & Nika, D. L. Phononics in low-dimensional materials. Mater. Today 15, 266–275 (June, 2012).
Paudel, T. R. & Lambrecht, W. R. L. Computational study of phonon modes in short-period AlN/GaN superlattices. Phys. Rev. B 80, 104202 (2009).
Schuller, J. A., Taubner, T. & Brongersma, M. L. Optical antenna thermal emitters. Nature Photon. 3, 658–661 (2009).
Yu, N. & Capasso, F. Flat optics with designer metasurfaces. Nature Mater. 13, 139–150 (2014).
Engheta, N. Circuits with light at nanoscales: optical nanocircuits inspired by metamaterials. Science 317, 1698–1702 (2007).
Acknowledgements
The authors express their thanks to D. S. Katzer, C. Ellis, A. Giles, D. Storm, V. Wheeler, J. Hite, N. Bassim and J. Robinson for helpful discussions and assistance with some of the images in the figures. Funding for all authors was provided by the Office of Naval Research and was administered by the Naval Research Laboratory Nanoscience Institute.
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Caldwell, J., Vurgaftman, I., Tischler, J. et al. Atomic-scale photonic hybrids for mid-infrared and terahertz nanophotonics. Nature Nanotech 11, 9–15 (2016). https://doi.org/10.1038/nnano.2015.305
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DOI: https://doi.org/10.1038/nnano.2015.305
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