A magnetic non-reciprocal isolator for broadband terahertz operation

Shalaby, M, Peccianti, M, Ozturk, Y and Morandotti, R (2013) A magnetic non-reciprocal isolator for broadband terahertz operation. Nature Communications, 4. p. 1558. ISSN 2041-1723

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Abstract

A Faraday isolator is an electromagnetic non-reciprocal device, a key element in photonics. It
is required to shield electromagnetic sources against the effect of back-reflected light, as well
as to limit the detrimental effect of back-propagating spontaneous emissions. A common isolator variant, the circulator, is widely used to obtain a complete separation between forward- and backward-propagating waves, thus enabling the realization of a desired transfer
function in reflection only. Here we demonstrate a non-reciprocal terahertz Faraday isolator, operating on a bandwidth exceeding one decade of frequency, a necessary requirement to achieve isolation with the (few-cycle) pulses generated by broadband sources. The exploited medium allows a broadband rotation, up to 194�/T, obtained using a SrFe12O19 terahertz transparent permanent magnet. This in turn enables the design of a stand-alone complete terahertz isolator without resorting to an external magnetic field bias, as opposed to all the optical isolators realized so far.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0350 Optics. Light
T Technology > TA Engineering (General). Civil engineering (General) > TA1501 Applied optics. Photonics
Depositing User: Marco Peccianti
Date Deposited: 11 Sep 2013 13:13
Last Modified: 13 Mar 2017 11:02
URI: http://sro.sussex.ac.uk/id/eprint/46114

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