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.
- SourceAvailable from: Kang Li
[Show abstract] [Hide abstract]
- "Different with the optical tamm states reported in Refs.    where the reflection dip results in a high transmission, the optical tamm states here are heavily absorbed by the metallic loss and trapped in the TML interface . As a result, it leads to a near-unity absorption peak at the reflection dip, as depicted in Fig. 2 with black line. "
ABSTRACT: Based on a two-dimensional plasmonic metal-dielectric-metal waveguide with a thin metallic layer and dual nanocavites inserted in the core, a novel nanostructured absorber is presented. A transfer matrix model for the proposed structure is established, and the optical spectra are investigated. Design results show that a narrow reflection spectrum occurs at position of the near-unity absorption, and is significantly influenced by the environment. It is able to generate a sensitivity as high as 1000 nm/RIU, which be used as an excellent sensing platform for chemical and biochemically relevant molecules.Photonics and Optoelectronics (SOPO), 2012 Symposium on; 01/2012
- [Show abstract] [Hide abstract]
ABSTRACT: We demonstrate that lasing can be obtained with the Tamm plasmon modes appearing at the interface between a multilayered dielectric structure and a metal. The sample consists in InGaAs/GaAs quantum wells embedded in an AlAs/AlGaAs Bragg reflector, on top of which a silver film was evaporated. A superlinear increase of the emission is observed under optical pumping as well as a drastic concentration of the emission pattern around the vertical direction, evidencing a lasing effect. Due to the particular features of these surface modes, Tamm lasers open interesting perspectives for the realization of integrated microlasers.Applied Physics Letters 03/2012; 100(12). DOI:10.1063/1.3697641 · 3.30 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: We have investigated numerically an optical bistability effect based on an analog of electromagnetically induced transparency (EIT) in a nanoscale plasmonic waveguide-coupled resonator system. The system consists of a metal-insulator-metal waveguide side-coupled with a slot cavity and a nanodisk cavity containing Kerr nonlinear material. By finite-difference time-domain simulations, the EIT-like spectral peak has a redshift with an increase of the dielectric constant of the nanodisk cavity. More importantly, we have achieved an optical bistability with threshold intensity about three times lower than that of recent literature [Appl. Opt.50, 5287 (2011)10.1364/AO.50.005287APOPAI1559-128X]. The results show that our plasmonic structure can find more excellent application in highly integrated optical circuits, especially all-optical switching.Applied Optics 11/2012; 51(31):7482-6. DOI:10.1364/AO.51.007482 · 1.78 Impact Factor