Accession Number:

ADA592243

Title:

Beaming Circularly Polarized Photons from Quantum Dots Coupled with Plasmonic Spiral Antenna (Postprint)

Descriptive Note:

Interim rept. 5 Nov 2009-21 Jun 2012

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH FUNCTIONAL MATERIALS DIV

Report Date:

2014-01-01

Pagination or Media Count:

13.0

Abstract:

Coupling nanoscale emitters via optical antennas enables comprehensive control of photon emission in terms of intensity, directivity and polarization. In this work we report highly directional emission of circularly polarized photons from quantum dots coupled to a spiral optical antenna. The structural chirality of the spiral antenna imprints spin state to the emitted photons. Experimental results reveal that a circular polarization extinction ratio of 10 is obtainable. Furthermore, increasing the number of turns of the spiral gives rise to higher antenna gain and directivity, leading to higher field intensity and narrower angular width of emission pattern in the far field. For a five-turn Archimedes spiral antenna, field intensity increase up to 70-fold simultaneously with antenna directivity of 11.7 dB has been measured in the experiment. The highly directional circularly polarized photon emission from such optically coupled spiral antenna may find important applications in single molecule sensing, quantum optics information processing and integrated photonic circuits as a nanoscale spin photon source.

Subject Categories:

  • Electrical and Electronic Equipment
  • Nuclear Physics and Elementary Particle Physics
  • Plasma Physics and Magnetohydrodynamics
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE