Tamm plasmons are electromagnetic states located at the interface between a dielectric Bragg mirror and a metal . Contrary to conventional surface plasmons, Tamm plasmons can exist in both TE and TM polarization and its parabolic dispersion lies above the light cone which allow a direct optical excitation at normal incidence. Besides, the Tamm mode confinement can be obtained by simply patterning the thin metallic film, such as microdisks [2,3] or microrectangles . Here, we aim at obtaining ultimate confinement using photonic crystal periodic structures in the metallic layer.
The samples are constituted by a DBR with 4 pairs of l/4n layers of Si and SiO2 above which periodic metallic patterns are defined using e-beam lithography and a 50nm gold deposition. Lift-off is performed at the end of the process. The period of the gratings is chosen to obtain a Tamm Bloch mode around 1.3micrometer.
Microreflectivity experiments show that Tamm Bloch modes exist in such 1D periodic structures. Using an original design, we create a 1D photonic band gap as large as 140nm. Finally, we will present experimental results on cavity-confined Tamm Bloch modes. All results are in good agreement with numerical calculations.
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Lydie Ferrier, Cécile Jamois, Clémentine Symonds, Joël Bellessa, and Taha Benyattou, "Tailoring Bloch modes in Tamm plasmons structures (Conference Presentation)," Proc. SPIE 10113, High Contrast Metastructures VI, 1011312 (Presented at SPIE OPTO: February 02, 2017; Published: 28 April 2017); https://doi.org/10.1117/12.2250319.5395679957001.
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