Compact nanomechanical plasmonic phase modulators [Ultracompact nano-mechanical plasmonic phase modulators]
- Rutgers, the State Univ. of New Jersey, Piscataway, NJ (United States)
- Univ. of Colorado at Colorado Springs, Colorado, Springs, CO (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Highly confined optical energy in plasmonic devices is advancing miniaturization in photonics. However, for mode sizes approaching ≈10 nm, the energy increasingly shifts into the metal, raising losses and hindering active phase modulation. Here, we propose a nanoelectromechanical phase-modulation principle exploiting the extraordinarily strong dependence of the phase velocity of metal–insulator–metal gap plasmons on dynamically variable gap size. We experimentally demonstrate a 23-μm-long non-resonant modulator having a 1.5π rad range, with 1.7 dB excess loss at 780 nm. Analysis shows that by simultaneously decreasing the gap, length and width, an ultracompact-footprint π rad phase modulator can be realized. This is achieved without incurring the extra loss expected for plasmons confined in a decreasing gap, because the increasing phase-modulation strength from a narrowing gap offsets rising propagation losses. Here, such small, high-density electrically controllable components may find applications in optical switch fabrics and reconfigurable plasmonic optics.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Institute of Standards and Technology (NIST); Air Force Research Laboratory - Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1239326
- Journal Information:
- Nature Photonics, Journal Name: Nature Photonics Vol. 9; ISSN 1749-4885
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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