Comb-like optical transmission spectrum resulting from a four-cornered two-waveguide-connected network

Yang, Xiangbo; Song, Huanhuan; Liu, Timon Chengyi

doi:10.1016/j.physleta.2013.09.026

Cited by 19 publications

(8 citation statements)

References 21 publications

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“…Three unit cells exist in the proposed DROWN. Previous studies on OWNs proved that the more unit cells an OWN possesses, the deeper the transmission valley will be . It seems that the number of unit cells can be increased to greatly improve the switching efficiency/transmission ratio.…”

Section: Extraordinary Switching Propertiesmentioning

confidence: 99%

“…Optical waveguide networks (OWNs), composed of 1D waveguide segments, are a type of artificial PBG structures, which have been studied intensively in the last two decades . Compared to PCs and other types of PBG materials/structures used in all‐optical switching, OWNs are capable of producing ultrastrong photonic localizations by introducing defects into the system .…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Design of a Pump‐Free Ultrahigh Efficiency All‐Optical Switching Based on a Defect Ring Optical Waveguide Network

Yang

2019

Annalen der Physik

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A theoretical design of a defect ring optical waveguide network is proposed to construct a pump-free ultrahigh efficiency all-optical switch. This switch creates ultrastrong photonic localization and causes the nonlinear dielectric in the defect waveguide to intensely respond. At its ON state, this material defect without Kerr response helps to produce a pair of sharp pass bands in the transmission spectrum to form the dual channel of the all-optical switch. When it is switched to its OFF state, the strong Kerr response induced refractive index change in the high nonlinear defect waveguide strongly alters the spectrum, leading to a collapse of the dual channels. Network equation and generalized eigenfunction method are used to numerically calculate the optical properties of the switch and obtain a threshold control energy of about 2.90 zJ, which is eight orders of magnitude lower than previously reported. The switching efficiency/transmission ratio exceeds 3×10 11 , which is six orders of magnitude larger than previously reported. The state transition time is nearly 108 fs, which is approximately two orders of magnitude faster than the previously reported shortest time. Furthermore, the switch size can be much smaller than 2.6 µm and will be suitable for integration.

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Section: Extraordinary Switching Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical Design of a Pump‐Free Ultrahigh Efficiency All‐Optical Switching Based on a Defect Ring Optical Waveguide Network

Yang

2019

Annalen der Physik

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“…Compared with the former, the structure symmetry of the latter is much more flexible [20,22,23], and the phase and amplitude measurements of the EM wave in the latter are also much more convenient [20,23]. It is found that optical waveguide networks can produce rich photonic attenuation mode [24], interesting comb-like optical transmission spectrum [25,26], extreme wide PBG [22,27,28], ultrastrong photonic localization [29][30][31][32], and so on.…”

Section: Introductionmentioning

confidence: 99%

Extraordinary characteristics for one-dimensional parity-time-symmetric periodic ring optical waveguide networks

Zhi

Yang

et al. 2018

Photon. Res.

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In this paper, we design a one-dimensional (1D) parity-time-symmetric periodic ring optical waveguide network (PTSPROWN) and investigate its extraordinary optical characteristics. It is found that quite different from traditional vacuum/dielectric optical waveguide networks, 1D PTSPROWN cannot produce a photonic ordinary propagation mode, but can generate simultaneously two kinds of photonic nonpropagation modes: attenuation propagation mode and gain propagation mode. It creates neither passband nor stopband and possesses no photonic band structure. This makes 1D PTSPROWN possess richer spontaneous PT-symmetric breaking points and causes interesting extremum spontaneous PT-symmetric breaking points to appear, where electromagnetic waves can create ultrastrong extraordinary transmission, reflection, and localization, and the maximum can arrive at 6.6556 × 10 12 and is more than 7 orders of magnitude larger than the results reported previously. 1D PTSPROWN may possess potential in designing high-efficiency optical energy saver devices, optical amplifiers, optical switches with ultrahigh monochromaticity, and so on.

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“…This artificial optical system has also aroused great interest [15][16][17][18][19][20] due to several extraordinary phenomena such as flat broadband light transport, [16] chiral mode conversion, [17] and ultra-strong transmission and reflection, [18] non-Hermitian particle-hole symmetry, [15,19] coherent switch. [20] In 1998, optical waveguide networks [21][22][23][24][25][26][27][28][29][30][31][32][33][34] were proposed as a new kind of photonic bandgap (PBG) structure. Compared with photonic crystals, it exhibits excellent characteristics such as higher flexibility in structural symmetry, [21,23,24] and great convenience in measuring the phase and amplitude of EM waves.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with photonic crystals, it exhibits excellent characteristics such as higher flexibility in structural symmetry, [21,23,24] and great convenience in measuring the phase and amplitude of EM waves. [21,23] Consequently, several interesting optical features and phenomena have been demonstrated in waveguide networks, such as extremely wide PBG, [24,25] comb-like optical transmission spectrum, [27,28] and ultra-strong photonic localization. [32,33] So far, there has been no report that involves a combination of optical waveguide network and anti-PT symmetry.…”

Section: Introductionmentioning

confidence: 99%

Extraordinary propagation characteristics of electromagnetic waves in one-dimensional anti-PT-symmetric ring optical waveguide network*

Xu¹,

Yang²,

Chen³

et al. 2020

Chinese Phys. B

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In this paper, we design a one-dimensional anti-PT-symmetric ring optical waveguide network (1D APTSPROWN). Using the three-material network equation and the generalized Floquet–Bloch theorem, we investigate its photonic mode distribution, and observe weak extremum spontaneous anti-PT-symmetric breaking points (WBPs) and strong extremum spontaneous anti-PT-symmetric breaking points (SBPs). Then the transmission spectrum is obtained by using the three-material network equation and the generalized eigenfunction method. The 1D APTSPROWN is found to generate ultra-strong transmission near SBPs and ultra-weak transmission near WBPs and SBPs, with the maximal and minimal transmissions being 4.08× 1012 and 7.08× 10−52, respectively. The maximal transmission has the same order of magnitude as the best-reported result. It is not only because the distribution of photonic modes generated by the 1D APTSROWN results in the coupling resonance and anti-resonance, but also because the 1D APTSROWN composed of materials whose real parts of refractive indices are positive and negative has two kinds of phase effects, which results in the resonance and anti-resonance effects in the same kind of photonic modes. This demonstrates that the anti-PT-symmetric and PT-symmetric optical waveguide networks are quite different, which leads to a more in-depth understanding of anti-PT-symmetric and PT-symmetric structures. This work has the potential for paving a new approach to designing single photon emitters, optical amplifiers, and high-efficiency optical energy saver devices.

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Comb-like optical transmission spectrum resulting from a four-cornered two-waveguide-connected network

Cited by 19 publications

References 21 publications

Theoretical Design of a Pump‐Free Ultrahigh Efficiency All‐Optical Switching Based on a Defect Ring Optical Waveguide Network

Theoretical Design of a Pump‐Free Ultrahigh Efficiency All‐Optical Switching Based on a Defect Ring Optical Waveguide Network

Extraordinary characteristics for one-dimensional parity-time-symmetric periodic ring optical waveguide networks

Extraordinary propagation characteristics of electromagnetic waves in one-dimensional anti-PT-symmetric ring optical waveguide network*

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