Journal
NANO LETTERS
Volume 13, Issue 1, Pages 142-147Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl303689c
Keywords
Optical nanoantenna; circuit theory; three-dimensional nanocircuit; plasmonics; metatronics; high-precision lithography
Categories
Funding
- Robert A. Welch Foundation [C-1220, C-1222]
- National Security Science and Engineering Faculty Fellowship (NSSEFF) [N00244-09-1-0067]
- K. Bala Texas Instruments Visiting Professorship in Electrical and Computer Engineering at Rice University
- U.S. Army Research Office [W911NF-11-1-0447]
- Office of Naval Research [N00014-10-1-0989, N00014-10-1-0942]
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Nanoantennas are key optical components that bridge nanometer-scale optical signals to far-field, free-space radiation. In analogy to radio frequency antennas where tuning and impedance-matching are accomplished with lumped circuit elements, one could envision nanoantenna properties controlled by nanoscale, optical frequency circuit elements in which circuit operations are based on photons rather than electrons. A recent investigation of the infrared nanocircuits has demonstrated the filtering functionality using dielectric gratings. However, these two-dimensional prototypes have limited applicability in real-life devices. Here we experimentally demonstrate the first optical nanoscale circuits with fully three-dimensional lumped elements, which we use to tune and impedance-match a single optical dimer nanoantenna. We control the antenna resonance and impedance bandwidth using suitably designed loads with combinations of basic circuit elements: nanoscale capacitors, inductors, and resistors. Our results pave the way toward extending conventional circuit concepts into the visible domain for applications in data storage, wireless optical links, and related venues.
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