Taming the flow of light via active magneto-optical impurities

Ramezani, Hamidreza; Lin, Zin; Kalish, Samuel; Kovanis, Vassilios; Vitebskiy, Ilya

doi:10.1364/oe.20.026200

Cited by 22 publications

(32 citation statements)

References 22 publications

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“…Although originally the interest on PT -symmetric systems was driven by a mathematical curiosity [1], during the last five years the field has blossomed and many applications in areas of physics, ranging from optics [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], matter waves [19,20] and magnonics [21,22] to acoustics [23][24][25] and electronics [26][27][28], have been proposed and experimentally demonstrated [4, 9, 10, 12-14, 17, 18, 24-26]. Importantly, the existence of the PT phase transition and specifically of the EP singularity played a prominent role in many of these studies, and subsequent technological applications.…”

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confidence: 99%

Experimental Realization of Floquet PT -Symmetric Systems

2017

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We provide an experimental framework where periodically driven PT -symmetric systems can be investigated. The set-up, consisting of two UHF oscillators coupled by a time-dependent capacitance, demonstrates a cascade of PT -symmetric broken domains bounded by exceptional point degeneracies. These domains are analyzed and understood using an equivalent Floquet frequency lattice with local PT -symmetry. Management of these PT -phase transition domains is achieved through the amplitude and frequency of the drive.PACS numbers: 42.25.Bs, 11.30.Er Introduction -Non-Hermitian Hamiltonians H which commute with the joint parity-time (PT ) symmetry might have real spectrum when some parameter γ, that controls the degree of non-hermiticity, is below a critical value γ PT [1]. In this parameter domain, termed exact PT -phase the eigenfunctions of H are also eigenfunctions of the PT -symmetric operator. In the opposite limit, coined the broken PT -phase, the spectrum consists (partially or completely) of pairs of complex conjugate eigenvalues while the eigenfunctions cease to be eigenfunctions of the PT operator. The transition point γ = γ PT shows all the characteristic features of an exceptional point (EP) singularity where both eigenfunctions and eigenvalues coalesce.Although originally the interest on PT -symmetric systems was driven by a mathematical curiosity [1], during the last five years the field has blossomed and many applications in areas of physics, ranging from optics [2-18], matter waves [19,20] and magnonics [21,22] [4, 9, 10, 12-14, 17, 18, 24-26]. Importantly, the existence of the PT phase transition and specifically of the EP singularity played a prominent role in many of these studies, and subsequent technological applications.Though the exploitation of PT -symmetric systems has been prolific, most of the attention has been devoted to static (i.e. time-independent) potentials. Recently, however, a parallel activity associated with time-dependent PT -symmetric systems has started to attract increasing attention [29][30][31][32][33][34][35][36][37][38][39]. The excitement for this line of research stems from two reasons: the first one is fundamental and it is associated with the expectation that new pathways in the PT -arena can lead to new exciting phenomena. This expectation is further supported by the fact that the investigation of time-dependent Hermitian counterparts led to a plethora of novel phenomena-examples include Rabi oscillations [40], Autler-Townes splitting [41], dynamical localization [42], dynamical Anderson localization [43], and coherent destruction of tunneling [44,45] (for a review see [46]). The second reason is technological and it is associated with the possibility to use driving schemes as a flexible experimental knob to realize new forms of reconfigurable synthetic matter [47,48]. Specif-

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confidence: 99%

Experimental Realization of Floquet PT -Symmetric Systems

2017

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“…The field of optical metamaterials has also offered opportunities for boosting the non-reciprocal response of magneto-optical materials by means of large field enhancement and localization. Two recent examples are plasmonic-enhanced Faraday rotation 19 and isolation enabled by parity-time symmetry 20 .…”

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Giant non-reciprocity at the subwavelength scale using angular momentum-biased metamaterials

2013

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Breaking time-reversal symmetry enables the realization of non-reciprocal devices, such as isolators and circulators, of fundamental importance in microwave and photonic communication systems. This effect is almost exclusively achieved today through magneto-optical phenomena, which are incompatible with integrated technology because of the required large magnetic bias. However, this is not the only option to break reciprocity. The Onsager-Casimir principle states that any odd vector under time reversal, such as electric current and linear momentum, can also produce a non-reciprocal response. These recently analysed alternatives typically work over a limited portion of the electromagnetic spectrum and/or are often characterized by weak effects, requiring large volumes of operation. Here we show that these limitations may be overcome by angular momentum-biased metamaterials, in which a properly tailored spatiotemporal modulation is azimuthally applied to subwavelength Fano-resonant inclusions, producing largely enhanced non-reciprocal response at the subwavelength scale, in principle applicable from radio to optical frequencies.

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“…The dispersion relation ω( k) for the infinite periodic stack of Fig. 1 can be calculated numerically using a standard transfer matrix approach [8,10]. We find that ω( k) displays asymmetry with respect to the Bloch wave vector k. For a given structural geometry, the degree of the spectral asymmetry depends on the magnitude of nonreciprocal circular birefringence of the magnetic layer and linear birefringence of the misaligned dielectric layers.…”

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confidence: 94%

Unidirectional lasing emerging from frozen light in nonreciprocal cavities

Ramezani

Vitebskiy

2014

Active Photonic Materials VI

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We introduce a class of unidirectional lasing modes associated with the frozen mode regime of non-reciprocal slow-wave structures. Such asymmetric modes can only exist in cavities with broken time-reversal and space inversion symmetries. Their lasing frequency coincides with a spectral stationary inflection point of the underlying passive structure and is virtually independent of its size. These unidirectional lasers can be indispensable components of photonic integrated circuitry.

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Taming the flow of light via active magneto-optical impurities

Cited by 22 publications

References 22 publications

Experimental Realization of Floquet PT -Symmetric Systems

Experimental Realization of Floquet PT -Symmetric Systems

Giant non-reciprocity at the subwavelength scale using angular momentum-biased metamaterials

Unidirectional lasing emerging from frozen light in nonreciprocal cavities

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