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Step forward to Compact Plasmonic Nanocircuit | Stop by the Poster Sessions

By Howard Lee


Today is a great day start with two plenary sessions from Gerhard Rempe and Larry Coldren, followed by whole afternoon of technical sessions, conference reception and poster sessions in the evening.

To conclude what I found exciting in the technology session and posters, I highlighted some of the works in the following.

Step forward to compact plasmonic nanocircuit

Prof. Min-Kyo Seo from KAIST talked about their work from Prof. Mark Brongersma at Stanford University on making an electrically driven plasmonic nanocirucit. They experimentally demonstrated an electrical pumped plasmonic light-emitting diode (LED)(emitting from a semiconductor quantum well) which is directly integrated to a plasmonic slot waveguide circuit with different functionalities such as splitting, freespace coupling and directional coupling. Although the efficiencies of the electrical driven LED and the coupling from the LED source to the plasmonic waveguide are not high (with coupling efficient of ~ 10 % to the waveguide) and the light source is not coherent, the work is an important step forward for future plasmonic circuit where the light source is electrically generated directly in the nanocircuit. Their result is published in March issue of Nature Photonics. (STu1M)[Nature Photonics 8, 244 (2014)].

Step forward to compact plasmonic nanocircuit
(Left) Schematic showing an integrated, electrically driven optical nanocircuit composed of three-dimensional slot-waveguide components, including two ultracompact splitters, a directional coupler and slot antennas. (Right) The nano-LED, with the quantum well located between the two red arrows. (STu1M)[Nature Photonics 8, 244 (2014)].

Poster Sessions: Broadband epsilon-near-zero metamaterials with gain media

Dr. Sun from Missouri University of Science and Technology discussed their theoretical work to me on designing a broadband epsilon-near-zero (ENZ) material (JTu4A.33). Their design of ENZ material based on a step-like metal-dielectric multilayer structures (see figure below) and he also discussed the use of gain material to obtain a broadband ENZ material with relative low loss. Although the structure is extremely difficult to fabricate (or even impossible), the work show an interesting approach to achieve a broadband ENZ material which would be useful for designing low loss metamaterial. Sun said that they are further working on the design of such ENZ metamaterial using step-like arrangement of nanoparticles, which would open up an easier and more realistic way for fabrication such material.

Broadband epsilon-near-zero metamaterials with gain media
(Left) Schematics of the proposed broadband ENZ meta-atoms. (Right) The simulation retrieved effective permittivity of the single gain meta-atom (solid curves) and the single non-gain meta-atom (dashed curves).[JTu4A.33]

Check back tomorrow to hear about more exciting highlights at CLEO: 2014.

Posted: 11 June 2014 by Howard Lee | with 0 comments

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