TY - UNPB
T1 - The physics of angular momentum radio
AU - Thidé, Bo
AU - Tamburini, F.
AU - Then, H.
AU - Someda, C. G.
AU - Ravanelli, R.~A.
PY - 2014/10/16
Y1 - 2014/10/16
N2 - Wireless communications, radio astronomy and other radio science
applications are predominantly implemented with techniques built on top
of the electromagnetic linear momentum (Poynting vector) physical layer.
As a supplement and/or alternative to this conventional approach,
techniques rooted in the electromagnetic angular momentum physical layer
have been advocated, and promising results from proof-of-concept radio
communication experiments using angular momentum were recently
published. This sparingly exploited physical observable describes the
rotational (spinning and orbiting) physical properties of the
electromagnetic fields and the rotational dynamics of the pertinent
charge and current densities. In order to facilitate the exploitation of
angular momentum techniques in real-world implementations, we present a
systematic, comprehensive theoretical review of the fundamental physical
properties of electromagnetic angular momentum observable. Starting from
an overview that puts it into its physical context among the other
Poincar\'e invariants of the electromagnetic field, we describe the
multi-mode quantized character and other physical properties that sets
electromagnetic angular momentum apart from the electromagnetic linear
momentum. These properties allow, among other things, a more flexible
and efficient utilization of the radio frequency spectrum.
Implementation aspects are discussed and illustrated by examples based
on analytic and numerical solutions.
AB - Wireless communications, radio astronomy and other radio science
applications are predominantly implemented with techniques built on top
of the electromagnetic linear momentum (Poynting vector) physical layer.
As a supplement and/or alternative to this conventional approach,
techniques rooted in the electromagnetic angular momentum physical layer
have been advocated, and promising results from proof-of-concept radio
communication experiments using angular momentum were recently
published. This sparingly exploited physical observable describes the
rotational (spinning and orbiting) physical properties of the
electromagnetic fields and the rotational dynamics of the pertinent
charge and current densities. In order to facilitate the exploitation of
angular momentum techniques in real-world implementations, we present a
systematic, comprehensive theoretical review of the fundamental physical
properties of electromagnetic angular momentum observable. Starting from
an overview that puts it into its physical context among the other
Poincar\'e invariants of the electromagnetic field, we describe the
multi-mode quantized character and other physical properties that sets
electromagnetic angular momentum apart from the electromagnetic linear
momentum. These properties allow, among other things, a more flexible
and efficient utilization of the radio frequency spectrum.
Implementation aspects are discussed and illustrated by examples based
on analytic and numerical solutions.
KW - Physics - Optics
KW - Physics - Classical Physics
UR - https://arxiv.org/abs/1410.4268
M3 - Working paper
BT - The physics of angular momentum radio
ER -