Abstract
Matching circuits for waveguide-nanoantenna connections are difficult to implement. However, if the waveguide permits only one-way propagation, the matching issue disappears since back-reflections cannot take place; the feed signal is converted to radiation at high efficiency. Hence, a terminated one-way waveguide may serve as an assembly consisting of a waveguide, a matching mechanism, and an antenna. Since one-way structures are inherently non-reciprocal, this antenna possesses different transmit and receive patterns. We test and demonstrate this concept on a recently suggested new class of one-way plasmonic waveguides and present an additional significant dynamic beam scanning functionality.
Highlights
Antenna theory in the radio-frequency (RF) regime is a well-established discipline, whose overwhelming practical success can be attributed mainly to its conceptually modular nature
Received 6 Sep 2012; revised 8 Nov 2012; accepted 8 Nov 2012; published 30 Nov 2012 14 January 2013 / Vol 21, No S1 / OPTICS EXPRESS A78 matching is not studied directly, in [20] it can be inferred indirectly through the ratio between the emission and the waveguide input
We concentrate in the one-way lower band [23]
Summary
Antenna theory in the radio-frequency (RF) regime is a well-established discipline, whose overwhelming practical success can be attributed mainly to its conceptually modular nature. We suggest a new concept for waveguide-nanoantenna assembly that, not modular, encapsulates all the three important components in a matched and natural way. Consider a guided mode that propagates, say, in the +zdirection, in a conventional waveguide of finite length When it hits the termination most of its energy is reflected back into the waveguide. If it is a one-way waveguide these back reflections cannot take place so the guided mode is converted to radiation at high efficiency. This conversion takes place only in a limited region near the end that plays the role of a local antenna. Since one-way structures are inherently non-reciprocal, the antenna possesses opposite transmitting and receiving patterns, and a dynamic scanning functionality
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