Unidirectional-propagating surface magnetoplasmon based on remanence and its application for subwavelength isolators

Abstract

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Ultra-subwavelength focusing and giant magnetic-field enhancement in a low-loss one-way waveguide based on remanence

“…In the above analysis, we ignored the loss in the waveguide which should be a good approximation in calculating the dispersion relation [16,33,34] a waveguide, loss should be carefully studied. In the lossy YIG material (see chapter 9 in [15]), k and µ in Eq.…”

“…More recently, we proposed a high-quality subwavelength isolator based on remanence (We note that remanence has been widely used in industry [15]) and we theoretically investigated this one-way SMP [16]. The one-way feature of the SMP mode provides a promising way to realizing light focusing, because it suppresses the reflections.…”

“…Recently, it was reported that one-way SMPs can be used to build a zero-dimensional [12] cavity, which breaks the time-bandwidth limit [13], and the study by Mann et al demonstrates that for overcoming the time-bandwidth limit, time-varying systems or nonlinearities are required [14]. More recently, we proposed a high-quality subwavelength isolator based on remanence (we note that remanence has been widely used in industry [15]) and we theoretically investigated this one-way SMP [16]. The one-way feature of the SMP mode provides a promising way to realize light focusing, because it suppresses the reflections.…”

Nonreciprocal and Topological Plasmonics

“…These unidirectional surface plasmon-polariton modes on magnetized plasma-dielectric interfaces, known as surface magneto-plasmons, were first discovered several decades ago, and are just one example of the host of unidirectional surface modes existing on complex (anisotropic, chiral, nonreciprocal) plasmonic materials. Such plasmonic platforms combine the advantages of subwavelength light confinement and enhancement offered by plasmonics with the backscattering-immune transport characteristics of unidirectional waves, and they are being increasingly investigated for novel or enhanced functionalities, such as compact Faraday rotation, isolation, and circulation [7][8][9][10] and extreme light-matter interactions, field enhancement, and giant nonlinear effects [11][12][13][14], to name a few. In this article, we review the rich physics of unidirectional surface modes on complex plasmonic materials, relating them to the properties of the bulk modes, and distinguishing between various classes of surface waves based on the concepts of reciprocity and topology.…”

Unidirectional and robust propagating surface magnetoplasmon in magneto-optical coaxial waveguides

“…To achieve the one-way transmission and break reciprocity, the strong external magnetic biasing field is commonly employed to influence the optical properties of magnetooptic (MO) materials, which gives rise to MO effects. [3][4][5][6][7][8] Researchers have shown several schemes for the realization of the one-way transmission mode by integrating MO materials with photonic crystals 3,4,[9][10][11] and spoof surface plasmons, 6,8,[12][13][14] respectively. Generally speaking, surface magnetoplasmons (SMPs) 15,16) are a simple and efficient way.…”