Tunable and asymmetric transmission of light in visible spectrum

Özer, Ahmet; Yilmaz, Nazmi; Bagci, Fehim Taha; Koçer, Hasan; Kurt, Hamza

doi:10.1117/12.2520961

Cited by 2 publications

(3 citation statements)

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“…Tunability, i.e. spectral shift, of the transmission asymmetry onset by changing the pitch of the structure has been previously observed [34], albeit with no explanation why this occurs, -although also in this work transmission is calculated within a semi-infinite substrate, which means the spectral location of the transmission asymmetry onset has been incorrectly identified for the same reason as in Ref. 32.…”

Section: On the Role Of The Pitch And Incorporating Structural Elemen...mentioning

confidence: 64%

“…Specifically, an observed transmission asymmetry has been attributed to having structural elements of a different lateral periodicity [30], to a different number of diffraction orders at each side of the structure [31], or to the Raleigh-Wood anomaly [32] with dependence on the substrate's dielectric, suggesting the excitation of surface waves as the key mechanism [33]. Other works [34,35] allude to the periodic pitch being the crucial controlling parameter but with no or true explanation on how the periodic pitch relates to the cause of transmission symmetry breaking. Additionally, the observed transmission-asymmetry onset for the case of normally incident light was correlated to the emergence of two first-order Bragg diffracted beams in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Breaking Transmission Symmetry Without Breaking Reciprocity in Linear All-Dielectric Polarization-Preserving Metagratings

Foteinopoulou

2022

Phys. Rev. Applied

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Transmission asymmetry in reciprocal systems offers an appealing alternative to bulkier non-reciprocal implementations for certain applications. Common reciprocal routes to transmission asymmetry of linearly polarized light involve a rotation of its polarization. Here, we explore a different route with a linear all-dielectric metagrating that preserves polarization, while lacking inversion symmetry along the surface-normal direction. Our all-angle transmission calculations reveal an abrupt transition from a symmetric to an asymmetric transmission response that traces the Bragg critical wavelength of higher-order beam emergence as a function of the incident angle. By adopting an analogy between scattering from a multi-port network and the metagrating paradigm we establish why the only necessary condition for transmission symmetry breaking in this class of systems, is the emergence of any higher-order Bragg diffracted beam. We further show how such a transmission symmetry breaking is consistent with reciprocity and also demonstrate the underpinning symmetry-breaking mechanism with a first-principle numerical experiment. Finally, we elucidate on some previous misconceptions regarding transmission symmetry breaking related to the role of the substrate or need for change of diffraction order number at each interface. Our proposed metagrating can exhibit a strong transmission asymmetry, with contrast that can be as high as ∼ 75%, thus underlining its potential as a blueprint for passive asymmetric or non-linear self-biasing non-reciprocal metasurfaces relevant to integrated and active photonics.

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Section: On the Role Of The Pitch And Incorporating Structural Elemen...mentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Breaking Transmission Symmetry Without Breaking Reciprocity in Linear All-Dielectric Polarization-Preserving Metagratings

Foteinopoulou

2022

Phys. Rev. Applied

View full text Add to dashboard Cite

show abstract

“…This concept of asymmetric light transmission is known as the Woods-Rayleigh anomaly, and was first discovered and quantified in the early 20 th century [14][15]. More recently this effect was investigated numerically for a number of nanostructured interfaces [16][17][18][19][20]. A recent work, relevant to the study discussed in this paper, is by Ozer et al [18] who showed asymmetric light transmission for normal incidence…”

Section: Introductionmentioning

confidence: 97%