Perfect absorber supported by optical Tamm states in plasmonic waveguide
ABSTRACT Based on a two-dimensional plasmonic metal-dielectric-metal (MDM) waveguide with a thin metallic layer and a dielectric photonic crystal in the core, a novel absorber at visual and near-infrared frequencies is presented. The absorber spectra and filed distributions are investigated by the transfer-matrix-method and the finite-difference time-domain method. Numerical results show that attributing to excitation of the optical Tamm states in the MDM waveguide core, the optical wave is trapped in the proposed structure without reflection and transmission, leading to perfect absorption as high as 0.991. The proposed absorber can find useful application in all-optical integrated photonic circuits.
IEEE Journal of Selected Topics in Quantum Electronics 07/2015; 21(4):1-6. DOI:10.1109/JSTQE.2014.2375151 · 3.47 Impact Factor
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ABSTRACT: The unique optical properties of Tamm plasmons (TPs) – such as flexible wavevector matching conditions including inplane wavevector within the light line, and existing both S- and P-polarized TPs − facilitate them for direct optical excitation. The Tamm plasmon-coupled emission (TPCE) from a combined photonic–plasmonic structure sustaining both surface plasmons (SPs) and TPs is described in this paper. The sensitivity of TPCE to the emission wavelength and polarization is examined with back focal plane imaging and verified with the numerical calculations. The results reveal that the excited probe can couple with both TPs and SPs, resulting in surface plasmon-coupled emission (SPCE) and TPCE, respectively. The TPCE angle is strongly dependent on the wavelength allowing for spectral resolution using different observation angles. These Tamm structures provide a new tool to control the optical emission from dye molecules and have many potential applications in fluorescence-based sensing and imaging.Laser & Photonics Review 11/2014; 8(6). DOI:10.1002/lpor.201400117 · 9.31 Impact Factor
Article: Critical coupling to Tamm plasmons[Show abstract] [Hide abstract]
ABSTRACT: The conditions of critical coupling of light to Tamm plasmons are investigated with comprehensive numerical simulations, highlighting the parameters that maximise absorption of incident light in the metal layer. The asymmetric response in reflection and absorption with respect to the direction of incidence is discussed, the two cases yielding different optimal coupling conditions. These findings are relevant for the design of optimised Tamm structures, particularly in applications such as narrow-band thermal emitters, field-enhanced spectroscopy and refractive-index sensing.Journal of optics 11/2014; 17(3). DOI:10.1088/2040-8978/17/3/035003 · 2.01 Impact Factor