1. On-Chip Hybrid Photonic–Plasmonic Light Concentratorfor Nanofocusing in an Integrated Silicon Photonics Platform.
- Author
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Luo, Ye, Chamanzar, Maysamreza, Apuzzo, Aniello, Salas-Montiel, Rafael, Nguyen, Kim Ngoc, Blaize, Sylvain, and Adibi, Ali
- Subjects
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PHOTONICS , *INTEGRATED circuits , *SILICON , *ELECTROMAGNETIC radiation , *DETECTORS , *QUANTUM information science - Abstract
The enhancement and confinement ofelectromagnetic radiation tonanometer scale have improved the performances and decreased the dimensionsof optical sources and detectors for several applications includingspectroscopy, medical applications, and quantum information. Realizationof on-chip nanofocusing devices compatible with silicon photonicsplatform adds a key functionality and provides opportunities for sensing,trapping, on-chip signal processing, and communications. Here, wediscuss the design, fabrication, and experimental demonstration oflight nanofocusing in a hybrid plasmonic–photonic nanotaperstructure. We discuss the physical mechanisms behind the operationof this device, the coupling mechanisms, and how to engineer the energytransfer from a propagating guided mode to a trapped plasmonic modeat the apex of the plasmonic nanotaper with minimal radiation loss.Optical near-field measurements and Fourier modal analysis carriedout using a near-field scanning optical microscope (NSOM) show a tightnanofocusing of light in this structure to an extremely small spotof 0.00563(λ/(2n(rmax)))3confined in 3D and an exquisite power input conversionof 92%. Our experiments also verify the mode selectivity of the device(low transmission of a TM-like input mode and high transmission ofa TE-like input mode). A large field concentration factor (FCF) ofabout 4.9 is estimated from our NSOM measurement with a radius ofcurvature of about 20 nm at the apex of the nanotaper. The agreementbetween our theory and experimental results reveals helpful insightsabout the operation mechanism of the device, the interplay of themodes, and the gradual power transfer to the nanotaper apex. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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