3D harnessing of light with 2.5D photonic crystals

Viktorovitch, Pierre; Bakir, Badhise Ben; Boutami, Salim; Leclercq, Jean‐Louis; Letartre, Xavier; Rojo-Romeo, P.; Seassal, Christian; Zussy, M.; Cioccio, L. Di; Fédéli, Jean-Marc

doi:10.1002/lpor.200910009

Cited by 50 publications

(41 citation statements)

References 41 publications

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“…Such enhancement is up to an order of magnitude larger compared to the ideal free-standing case and hence cannot just be explained by a reduction of radiative losses by the presence of a reflecting substrate. For the case of the G2 and G4 modes, the spatial distribution of the field intensity is maintained and the origin of the enhancement is related to constructive interference, similar to the case of the so-called 2.5 PC, 22 where light confinement is improved by the introduction of a dielectric reflector below a slab 2D PC. For the G1 and G3 modes, we can see how the total field intensity changes if compared to the free-standing system, and it is mostly concentrated close to the metal substrate, giving them its "plasmonic" character.…”

Section: Metallic Substratementioning

confidence: 99%

Light confinement by two-dimensional arrays of dielectric spheres

López‐García

López

et al. 2012

Phys. Rev. B

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We present a study on the ability of two-dimensional close-packed arrays of submicron dielectric spheres to confine electromagnetic radiation. Substrates having different nature, either dielectric or metallic, are considered, and the evolution of the strong spatial redistribution of the total field intensity is monitored by means of numerical simulations. The physical origin of the different modes of the system is further studied by measuring the optical response of the hybrid structures and reproducing it with an analytic effective medium model. The study evidences that the use of metallic substrates provides the best scenario for enhancing light-matter interaction in this kind of system, pointing out that the hybrid modes arising from the combination of periodic dielectric lattices and metallic substrates cannot be treated as purely photonic or plasmonic.

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Section: Metallic Substratementioning

confidence: 99%

Light confinement by two-dimensional arrays of dielectric spheres

López‐García

López

et al. 2012

Phys. Rev. B

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“…As a proof-of-concept, the transformation of a Dirac-band to a flatband in a "comb" grating structure is experimentally demonstrated by simply tuning the vertical symmetry breaking. We emphasize that our approach is very generic and can be applied to the design of a wide variety of devices for free space as well as planar integrated photonics.Inside the wide family of periodic photonic structures, HCGs have played a fast growing part during the last 20 years [36][37][38]. Apart from rare exceptions [39][40][41] reports in the literature are essentially dedicated to HCGs with non-broken vertical symmetry.…”

mentioning

confidence: 99%

“…Inside the wide family of periodic photonic structures, HCGs have played a fast growing part during the last 20 years [36][37][38]. Apart from rare exceptions [39][40][41] reports in the literature are essentially dedicated to HCGs with non-broken vertical symmetry.…”

mentioning

confidence: 99%

Symmetry Breaking in Photonic Crystals: On-Demand Dispersion from Flatband to Dirac Cones

et al. 2018

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We demonstrate that symmetry breaking opens a new degree of freedom to tailor the energymomentum dispersion in photonic crystals. Using a general theoretical framework in two illustrative practical structures, we show that breaking symmetry enables an on-demand tuning of the local density of states of a same photonic band from zero (Dirac cone dispersion) to infinity (flatband dispersion), as well as any constant density over an adjustable spectral range. As a proof-of-concept, we experimentally demonstrate the transformation of a very same photonic band from conventional quadratic shape to Dirac dispersion, flatband dispersion and multivaley one, by finely tuning the vertical symmetry breaking. Our results provide an unprecedented degree of freedom for optical dispersion engineering in planar integrated photonic devices.Engineering the energy-momentum dispersion of photonic structures is at the heart of contemporary optics research. This fundamental feature molds the light propagation [1], dictates the coupling with free space [2], and tailors light-matter interactions [3]. Such a dispersion engineering is generally achieved through a designed periodic arrangement of materials with different permittivities in photonic crystals, metamaterials and metasurfaces. Recently, two particular types of dispersions have been intensively studied: flatband dispersion [4][5][6][7][8][9][10][11][12][13] and Dirac dispersion [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. The first one provides slow light of zero group velocity with high density of states for a broad range of the Brillouin zone, thus greatly enhances light-matter interaction and nonlinear behaviors for low-threshold micro-lasers and information processing applications [30,31]. Moreover, flatband gives rise to localized stationary eigenstates which are extremely sensitive to disorder effects due to an infinite effective mass [7,14]. This suggests new regime of light localization [8,9] other than conventional concepts such as Anderson localization [32,33] and optical bound states in continuum [34,35]. Being an opposite extreme to flat dispersion, Dirac dispersion (double Dirac cones with no bandgap) corresponds to massless photonic states. By analogy with the propagation of electrons in graphene, Dirac photons propagation could lead to phenomena such as Klein tunneling [19] and Zitterbewegung [20] for photons. Moreover, photonic Dirac dispersion opens the way to realize large-area single mode lasers [21,22]; and enables many exotic physical features such as zero-refractive index materials for transformation optics applications [15,17,18] and photonic topological insulator [23][24][25][26][27][28]. Due to their completely opposite characteristics, flatband and Dirac dispersion are usually attributed to different bands of the photonic structures (2D tight-binding lattices [5,6,8,9], accidental degeneracy in 2D photonic crystal [15][16][17][18]). Other configurations exhibit the sole presence of flatband states (1D tight-binding lattices [7,10], dispersio...

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“…Another way is to design new sensors using photonic crystals (PCs) concepts. Photonic crystals are periodic arrangements of dielectric media (Joannopoulos et al, 1995;Viktorovitch et al, 2007Viktorovitch et al, , 2010. The periodicity can be either along one direction for onedimensional (1D) PCs, in a plane for two-dimensional (2D) PCs, or in all dimensions for three-dimensional (3D) PCs.…”

Section: Novel Photonic-crystal-based Biosensorsmentioning

confidence: 99%

“…When excited by a light beam at normal incidence, such a device can support particular modes, called Fano resonances that result from the coupling between the discrete bands of the 1D PC and the continuous states of the surrounding medium seen by the incident beam. These resonances are highly confined within the top layer and can have very high spectral finesse (Jamois et al, 2010b;Viktorovitch et al, 2007Viktorovitch et al, , 2010. If the device is conveniently designed, the excitation of the Fano resonance can lead to a complete switch of the reflectivity from zero reflection (i.e.…”

Section: Planar Photonic-crystal Biosensormentioning

confidence: 99%