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A magnetic non-reciprocal isolator for broadband terahertz operation
journal contribution
posted on 2023-06-08, 15:39 authored by M Shalaby, Marco Peccianti, Y Ozturk, R MorandottiA 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.
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Publication status
- Published
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- Published version
Journal
Nature CommunicationsISSN
2041-1723Publisher
Nature Publishing GroupExternal DOI
Volume
4Page range
1558Department affiliated with
- Physics and Astronomy Publications
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- No
Peer reviewed?
- Yes
Legacy Posted Date
2013-09-11First Compliant Deposit (FCD) Date
2013-09-11Usage metrics
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