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Enabling High Efficiency Nanoplasmonics with Novel Nanoantenna Architectures #MMPMID26620270
Cohen M; Shavit R; Zalevsky Z
Sci Rep 2015[]; 5 (ä): ä PMID26620270show ga
Surface plasmon polaritons (SPPs) are propagating excitations that arise from coupling of light with collective electron oscillations. Characterized by high field intensity and nanometric dimensions, SPPs fashion rapid expansion of interest from fundamental and applicative perspectives. However, high metallic losses at optical frequencies still make nanoplasmonics impractical when high absolute efficiency is paramount, with major challenge is efficient plasmon generation in deep nanoscale. Here we introduce the Plantenna, the first reported nanodevice with the potential of addressing these limitations utilizing novel plasmonic architecture. The Plantenna has simple 2D structure, ultracompact dimensions and is fabricated on Silicon chip for future CMOS integration. We design the Plantenna to feed channel (20?nm?×?20?nm) nanoplasmonic waveguides, achieving 52% coupling efficiency with Plantenna dimensions of ?3/17,000. We theoretically and experimentally show that the Plantenna enormously outperforms dipole couplers, achieving 28?dB higher efficiency with broad polarization diversity and huge local field enhancement. Our findings confirm the Plantenna as enabling device for high efficiency plasmonic technologies such as quantum nanoplasmonics, molecular strong coupling and plasmon nanolasers.