Terahertz Faraday rotation in a magnetic liquid: High magneto-optical figure of merit and broadband operation in a ferrofluid

Shalaby, Mostafa; Peccianti, Marco; Öztürk, Yavuz; Clerici, Matteo; Al-Naib, Ibraheem; Razzari, Luca; Ozaki, T.; Mazhorova, Anna; Skorobogatiy, Maksim; Morandotti, Roberto

doi:10.1063/1.4729132

Cited by 56 publications

(29 citation statements)

References 18 publications

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“…Faraday rotation at terahertz frequencies has been demonstrated at room temperature in both solid3132 and liquid33 samples. However, in comparison, our PR has three main advantages towards the realization of an isolation device.…”

Section: Resultsmentioning

confidence: 99%

A magnetic non-reciprocal isolator for broadband terahertz operation

et al. 2013

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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.

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Section: Resultsmentioning

confidence: 99%

A magnetic non-reciprocal isolator for broadband terahertz operation

et al. 2013

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“…To date, THz magneto-optical phenomena have been mostly studied either in conducting materials without magnetic order or in magnetically ordered non-conducting materials. [8][9][10][11][12][13][14][15][16][17][18][19] Moreover, the majority of these works studied the Faraday rotation, while other magneto-optical effects, like magnetization dependent linear birefringence and dichroism, may be equally important for establishing a link between electronic transport properties and THz magneto-optics. Measurements on magnetically ordered and conducting samples were reported in Refs.…”

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Terahertz magneto-optics in the ferromagnetic semiconductor HgCdCr2Se4

Huisman

Mikhaylovskiy

Telegin

et al. 2015

Applied Physics Letters

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The magneto-optical response of the ferromagnetic semiconductor HgCdCr2Se4 at terahertz (THz) frequencies is studied using polarization sensitive THz time-domain spectroscopy. It is shown that the polarization state of broadband terahertz pulses, with a spectrum spanning from 0.2 THz to 2.2 THz, changes as an even function of the magnetization of the medium. Analysing the ellipticity and the rotation of the polarization of the THz radiation, we show that these effects originate from linear birefringence and dichroism, respectively, induced by the magnetic ordering. These effects are rather strong and reach 102 rad/m at an applied field of 1 kG which saturates the magnetization of the sample. Our observation serves as a proof-of-principle showing strong effects of the magnetic order on the response of a medium to electric fields at THz frequencies. These experiments also suggest the feasibility of spin-dependent transport measurements on a sub-picosecond timescale.

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“…Recently, magnetic fluids (MFs) as plain colloidal materials in magnetics get renewed and extensive interests in optics with the increasing development of optical communications, optical sensing and nanoscience and technology [30][31][32][33][34][35][36][37][38][39]. We have proposed to achieve the extremely large bandwidth and ultralow-dispersion slow light in PC waveguides with MFs as the background [40].…”

Section: Introductionmentioning

confidence: 99%

Tunable flat band slow light in reconfigurable photonic crystal waveguides based on magnetic fluids

Wang

et al. 2013

Optics Communications

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Terahertz Faraday rotation in a magnetic liquid: High magneto-optical figure of merit and broadband operation in a ferrofluid

Cited by 56 publications

References 18 publications

A magnetic non-reciprocal isolator for broadband terahertz operation

A magnetic non-reciprocal isolator for broadband terahertz operation

Terahertz magneto-optics in the ferromagnetic semiconductor HgCdCr2Se4

Tunable flat band slow light in reconfigurable photonic crystal waveguides based on magnetic fluids

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