A magnetic non-reciprocal isolator for broadband terahertz operation

Mostafa Shalaby, Marco Peccianti, Yavuz Ozturk and Roberto Morandotti ()
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Mostafa Shalaby: INRS-EMT
Marco Peccianti: Institute for Complex Systems-CNR
Yavuz Ozturk: INRS-EMT
Roberto Morandotti: INRS-EMT

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: 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.

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2572

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DOI: 10.1038/ncomms2572

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