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Published November 2014 | Supplemental Material
Journal Article Open

Nanoscale Conducting Oxide PlasMOStor


We experimentally demonstrate an ultracompact PlasMOStor, a plasmon slot waveguide field-effect modulator based on a transparent conducting oxide active region. By electrically modulating the conducting oxide material deposited into the gaps of highly confined plasmonic slot waveguides, we demonstrate field-effect dynamics giving rise to modulation with high dynamic range (2.71 dB/μm) and low waveguide loss (∼0.45 dB/μm). The large modulation strength is due to the large change in complex dielectric function when the signal wavelength approaches the surface plasmon resonance in the voltage-tuned conducting oxide accumulation layer. The results provide insight about the design of ultracompact, nanoscale modulators for future integrated nanophotonic circuits.

Additional Information

© 2014 American Chemical Society. Received: August 5, 2014; revised: October 3, 2014. Publication Date (Web): October 10, 2014. This work was supported by the Multidisciplinary University Research Initiative Grant (Air Force Office of Scientific Research, FA9550-12-1-0024) and used facilities supported by the DOE 'Light-Material Interactions in Energy Conversion' Energy Frontier Research Center under grant DE-SC0001293 and the Kavli Nanoscience Institute (KNI) at Caltech. H.W.L. acknowledges the Croucher Foundation of Hong Kong. G.P. and S.P.B. acknowledge the National Science Foundation. A.K. and U.P. acknowledge funding of the German Research Foundation (DFG) through the Cluster of Excellence Engineering of Advanced Materials (EAM) and the Erlangen Graduate School in Advanced Optical Technologies (SAOT).

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