Two-path solid-state interferometry using ultra-subwavelength two-dimensional plasmonic waves

Kitty Y.M. Yeung, Hosang Yoon, William Andress, Ken West, Loren Pfeiffer, Donhee Ham

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We report an on-chip solid-state Mach-Zehnder interferometer operating on two-dimensional (2D) plasmonic waves at microwave frequencies. Two plasmonic paths are defined with GaAs/AlGaAs 2D electron gas 80 nm below a metallic gate. The gated 2D plasmonic waves achieve a velocity of ∼c/300 (c: free-space light speed). Due to this ultra-subwavelength confinement, the resolution of the 2D plasmonic interferometer is two orders of magnitude higher than that of its electromagnetic counterpart at a given frequency. This gigahertz proof-of-concept at cryogenic temperatures can be scaled to the terahertz-infrared range for room temperature operation, while maintaining the benefits of ultra-subwavelength confinement.

Original languageEnglish (US)
Article number021104
JournalApplied Physics Letters
Issue number2
StatePublished - Jan 14 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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