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Terahertz all-optical modulation in a silicon-polymer hybrid system

Hochberg, Michael and Baehr-Jones, Tom and Wang, Guangxi and Shearn, Michael and Harvard, Katherine and Luo, Jingdong and Chen, Baoquan and Shi, Zhengwei and Lawson, Rhys and Sullivan, Phil and Jen, Alex K. Y. and Dalton, Larry and Scherer, Axel (2006) Terahertz all-optical modulation in a silicon-polymer hybrid system. Nature Materials, 5 (9). pp. 703-709. ISSN 1476-1122. http://resolver.caltech.edu/CaltechAUTHORS:20150324-133535247

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Abstract

Although gigahertz-scale free-carrier modulators have been demonstrated in silicon, intensity modulators operating at terahertz speeds have not been reported because of silicon's weak ultrafast nonlinearity. We have demonstrated intensity modulation of light with light in a silicon–polymer waveguide device, based on the all-optical Kerr effect—the ultrafast effect used in four-wave mixing. Direct measurements of time-domain intensity modulation are made at speeds of 10 GHz. We showed experimentally that the mechanism of this modulation is ultrafast through spectral measurements, and that intensity modulation at frequencies in excess of 1 THz can be obtained. By integrating optical polymers through evanescent coupling to silicon waveguides, we greatly increase the effective nonlinearity of the waveguide, allowing operation at continuous-wave power levels compatible with telecommunication systems. These devices are a first step in the development of large-scale integrated ultrafast optical logic in silicon, and are two orders of magnitude faster than previously reported silicon devices.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1038/nmat1719 DOIArticle
http://www.nature.com/nmat/journal/v5/n9/full/nmat1719.htmlPublisherArticle
http://rdcu.be/coiWPublisherFree ReadCube access
Additional Information:© 2006 Nature Publishing Group. Received 9 February 2006; Accepted 20 July 2006; Published online 20 August 2006. We gratefully acknowledge research support from the National Science Foundation Center on Materials and Devices for Information Technology Research (CMDITR), through grant DMR-0120967 by the AFOSR under contract F49620-03-1-0418, and by Boeing under the SRDMA program. We also thank the Department of Homeland Security and the National Science Foundation for generous support through graduate research fellowships. Finally, we would like to thank the Kavli Nanoscience Institute, where the devices described in this work were fabricated. Competing interests statement: The authors declare no competing financial interests.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
NSFDMR-0120967
Air Force Office of Scientific Research (AFOSR)F49620-03-1-0418
Boeing SRDM ProgramUNSPECIFIED
Department of Homeland SecurityUNSPECIFIED
Record Number:CaltechAUTHORS:20150324-133535247
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150324-133535247
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56033
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Mar 2015 22:47
Last Modified:24 Mar 2015 22:47

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