Abstract
Photonic bandgap engineering plays a key role in modern photonics since it allows for an ultimate control of photon propagation in periodic dielectric or metallic media. Tamm plasmon structures are a particularly attractive platform since the electromagnetic field can be completely controlled by patterning the thin metal layer. Up to now, only macroscopic patterning (larger than the operation wavelength) has been experimentally demonstrated, leading to 3D confinement of light but suffering from a lack of fine control of the dispersion properties of Tamm plasmons. Here, we report for the first time the opening of a bandgap in Tamm plasmon structures via subwavelength-periodic patterning of the metallic layer. By adopting a “double period” design, we experimentally put into evidence a photonic bandgap for the TE polarization up to 150 nm wide in the telecom wavelength range. Moreover, such a design offers a great flexibility to tailor on-demand, and independently, the bandgap size from 30 nm to 150 nm and its spectral position within a range of 50 nm. Finally, by implementing a defect cavity within the Tamm plasmon photonic crystal, a 1.6 μm cavity supporting a single highly confined Tamm mode is experimentally demonstrated. All experimental results are in perfect agreement with numerical calculations. Our results demonstrate the possibility to engineer novel band dispersion with surface modes of hybrid metallic/dielectric structures, thus opening the way to applications in topological photonics, metamaterials, and parity-time symmetry physics.
Highlights
Photonic bandgap engineering plays a key role in modern photonics since it allows for an ultimate control of photon propagation in periodic dielectric or metallic media.1 In such structures, photons cannot propagate in the direction of periodicity within given ranges of energies, to the forbidden gaps for electrons in crystals
The concept of photonic nanocavity has been widely used to demonstrate lasing in microcavities,13,14 enhancement of spontaneous emission,15,16 strong coupling regime between quantum emitters and photonic defect cavity,17,18 and exciton polariton lasing in photonic crystal cavities
We first highlight the mechanism of bandgap opening of Tamm plasmon photonic crystals (i.e., Tamm structures with the periodic metallic layer in the regime a/λ ≪ 1)
Summary
Photonic bandgap engineering plays a key role in modern photonics since it allows for an ultimate control of photon propagation in periodic dielectric or metallic media. In such structures, photons cannot propagate in the direction of periodicity within given ranges of energies, to the forbidden gaps for electrons in crystals. Photonic bandgap engineering plays a key role in modern photonics since it allows for an ultimate control of photon propagation in periodic dielectric or metallic media.. Photonic bandgap engineering plays a key role in modern photonics since it allows for an ultimate control of photon propagation in periodic dielectric or metallic media.1 In such structures, photons cannot propagate in the direction of periodicity within given ranges of energies, to the forbidden gaps for electrons in crystals. At the edges of the forbidden gap, as the group velocity is close to zero, the high density of states leads to strong enhancement of the lightmatter interaction This unique property has been widely used for the realization of various nanophotonic devices, with applications such as integrated and mirror-free microlasers or enhancement of nonlinear effects.. The concept of photonic nanocavity has been widely used to demonstrate lasing in microcavities, enhancement of spontaneous emission, strong coupling regime between quantum emitters and photonic defect cavity, and exciton polariton lasing in photonic crystal cavities.
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