@misc{10481/69610,
year = {2017},
url = {http://hdl.handle.net/10481/69610},
abstract = {Since   the   pioneering   work   of   Heinrich   Hertz,
perfect-electric  conductor  (PEC)  loop  antennas  for  RF  appli-
cations   have   been   studied  extensively.   Meanwhile,  nanoloops
are  promising  in  the  optical  regime  for  their  applications  in  a
wide  range  of  emerging  technologies.  Unfortunately,  analytical
expressions for the radiation properties of conducting loops have
not  been  extended  to  the  optical  regime.  This  paper  presents
closed-form   expressions   for   the   electric   fields,  total   radiated
power, directivity, and gain for thin-wire nanoloops operating in
the terahertz, infrared and optical regimes. This is accomplished
by  extending  the  formulation   for  PEC  loops  to  include  the
effects  of  dispersion  and  loss.  The  expressions  derived  for  a
gold  nanoloop  are  implemented  and  the  results  agree  well  with
full-wave  computational  simulations,  but  with  a  speed  increase
of  more  than  300
×
.  This  allows  the  scientist  or  engineer  to
quickly  prototype   designs   and   gain   a   deeper   understanding
of  the  underlying  physics.  Moreover,  through  rapid  numerical
experimentation, these closed-form expressions made possible the
discovery  that  broadband  superdirectivity  occurs  naturally  for
nanoloops of a specific size and material composition. This is an
unexpected  and  potentially  transformative  result  that  does  not
occur  for  PEC  loops.  Additionally,  the  Appendices  give  useful
guidelines on  how to efficiently compute the required integrals.},
organization = {Spanish Ministry of Education through the Commission Fulbright Program “Salvador de Madariaga” under Grant PR X14/00320},
organization = {Spanish and Andalusian Research Programs under Grant TEC2013-48414-C3-01 and Grant P12-TIC-1442},
organization = {Center for Nanoscale Science, NSF Materials Research Science a nd Engineering Center, under Award DMR-1420620},
publisher = {IEEE},
keywords = {Antenna theory},
keywords = {Loop antennas},
keywords = {Nanotechnology},
keywords = {Submillimeter wave technology},
title = {Closed-Form Expressions for the Radiation Properties of Nanoloops in the Terahertz, Infrared and Optical Regimes},
doi = {10.1109/TAP.2016.2624150},
author = {Lu, B. Q. and Nagar, J. and Yue, T. and Fernández Pantoja, Mario Alberto and Werner, Douglas H.},
}