Ultrahigh-contrast-ratio silicon Fano diode

Ding, Weiqiang; Luk’yanchuk, Boris; Qiu, Cheng‐Wei

doi:10.1103/physreva.85.025806

Cited by 68 publications

(47 citation statements)

References 53 publications

(59 reference statements)

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“…One of the proposals was the optical isolator based on the Faraday effect in magneto-optical crystals, 1 but such magneto-optical component needs a strong external pump, the volume of which is so huge that it hinders the applications in the integrated photonic systems. Since then, various schemes with different principles or materials were proposed to achieve high integration, as well as the high nonreciprocal transmission ratio, such as using optoacoustic effect, 2 second-harmonic generation, 3 absorbing multilayer system, 4 asymmetric nonlinear absorption, 5 ring resonator structures, 6-8 Fano effect, 9,10 micro-optomechanical devices with flexible Fabry-Perot, 11 left-hand materials, 12 photonic crystal structures, 13,14 parity-time system, 15 and Bragg grating structures. 16 However, majority of these works neglect the shape of the optical field, which plays a critical role in optical light processing with information after propagating through the devices.…”

Section: Introductionmentioning

confidence: 99%

Discrete soliton diode induced by synthetic gauge phase

Huang

Zhu

et al. 2017

J. Nonlinear Optic. Phys. Mat.

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We demonstrate the nonreciprocal dynamics of discrete solitons (DSs) induced by a uniform synthetic gauge phase (SGP) in one-dimensional waveguide array. The SGP is embedded into the coupling constant between the waveguides, which provides a directional momentum to the propagating fields and creates a nonreciprocal for the system. When a kicked Gaussian wave packet propagates through the waveguide arrays, diode effects are formed. Dependence between the diode effect and the SGP is studied. We found that the threshold of the reverse breakdown of this optical diode exhibits a perfect linear dependence against the SGP, and an extremely high diode quality can be achieved when the initial phase tilt exactly compensates the initial momentum provided by the SGP. Moreover, the direction of the diode can be switched by the direction of the SGP, which brings additional freedom to control the one-way propagation of the DSs. Our finding may have potential application to realizing new devices in high-speed all-optical communications.

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Section: Introductionmentioning

confidence: 99%

Discrete soliton diode induced by synthetic gauge phase

Huang

Zhu

et al. 2017

J. Nonlinear Optic. Phys. Mat.

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“…Conventional methods were based on the Faraday effect in magneto-optical crystals [1], but such magneto-optical components hinder the applications in integrated photonic systems. Since then, the research on optical diodes became very intense, and many compact schemes were proposed, using opto-acoustic effect [2], second-harmonic generation [3], absorbing multilayer system [4], asymmetric nonlinear absorption [5], ring-resonator structures [6,7], Fano effect [8,9], micro-optomechanical devices with flexible FabryPerot [10], left-hand materials [11], and photonic crystal structures [12][13][14][15][16]. While the majority of these work concentrated on high nonreciprocal transmission ratio [7,15], the shape of the optical field after propagating through the devices was neglected.…”

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confidence: 99%

Slow-light all-optical soliton diode based on tailored Bragg-grating structure

Deng

Huang

et al. 2015

Opt. Lett.

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An all optical soliton diode (AOSD) is proposed based on a sandwich nonlinear Bragg-grating structure: a linearly chirped Bragg-grating linked to a uniform Bragg-grating and again to a chirped Bragg-grating. The nonreciprocity is achieved by introducing two spatially asymmetric chirped Bragg-gratings with optical nonlinearity. High transmission ratio up to 150 is obtained when launching a picosecond Gaussian pulse into the setting. We find that such pulses in a form of solitons propagate at a rather small velocity (< 0.03c) when pulse wavelength is selected in the vicinity of photonic bandgap. Optical diode, a nonreciprocal device that transmits light only in one direction and blocks that in the opposite direction, is a key enabler for optical information processing. To realize the optical diode, breaking the symmetry of wave propagation is necessary but it is still a challenge problem. Many schemes have been proposed to solve such a problem. Conventional methods were based on the Faraday effect in magneto-optical crystals [1], but such magneto-optical component hinders the applications in integrated photonic systems. Since then, the research on optical diodes became very intense, and many compact schemes were proposed, using opto-acoustic effect [12][13][14][15][16]. While majorities of these work concentrated on high nonreciprocal transmission ratio [7, 15], the shape of the optical field after propagating through the devices was neglected.In addition to those attempts, an important candidate for the generation of optical diodes is based on periodic grating structures due to their tunability and cascadability. Using the edge of photonic bandgap [17], as well as the consideration of optical nonlinearity, the optical diode was first put forward in a one-dimensional photonic material with spatial gradation in the refractive index. Later, an all-optical diode was demonstrated in a periodically LiNbO 3 channel waveguide using quasiphase matching [18]. Non-reciprocal transmission of circular polarized light at the photonic-bandgap regions based on electro-tunable liquid-crystal hetero-junctions was demonstrated experimentally and theoretically [19].Similarly to [19], we propose a sandwich structure based on nonlinear Bragg gratings: a linearly chirped Bragg-grating (CBG) [20] linked through a uniform * Electronic address: Corresponding author: yongyaoli@gmail.com Bragg-graitng (UBG), and again to a CBG. Using this setting, a hight-Q and slow-light all-optical soliton diode (AOSD) is achieved. It was demonstrated that, by introducing a CBG cascaded a UBG structure [21, 22], strong retardation of optical pulses, as well as the creation of standing stable pulses were realized. These pulses can preserve its shape while propagating along the gratings, as a results of the balance between optical induced nonlinearity and pulse dispersion, which can be termed as a BG soliton [23][24][25][26][27][28][29][30][31]. In our setting, it is possible to break the reciprocity by introducing such two spatially asymmetric CBG struct...

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“…Since the magneto-optical isolator requires a strong external pump, it hinders the applications in a highly integrated photonic systems. Other schemes were also reported with different principles or materials such as using optoacoustic effect [2], second-harmonic generation [3], absorbing multilayer system [4], asymmetric nonlinear absorption [5], ring-resonator structures [6][7][8], Fano effect [9,10], micro-optomechanical devices with flexible Fabry-Perot [11], left-hand materials [12], photonic crystal structures [13,14] and parity-time system [15]. We note that although high nonreciprocal transmission ratio could be achieved using these schemes, the shape of the light field after propagating through the devices is usually neglected.…”

mentioning

confidence: 99%

Femtosecond soliton diode on heterojunction Bragg-grating structure

Deng

Lin

et al. 2016

Applied Physics Letters

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We numerically propose a scheme for realizing an all-optical femtosecond soliton diode based on a tailored heterojunction Bragg grating, which is designed by two spatially asymmetric chirped cholesteric liquid crystals. Our simulations demonstrate that with the consideration of optical nonlinearity, not only the femtosecond diode effect with nonreciprocal transmission ratio up to 120 can be achieved, but also the optical pulse evolving into soliton which maintains its shape during propagation through the sample is observed. Further, the influence of pulse width and the carrier wavelength to the femtosecond diode effect is also discussed in detail. Our demonstrations might suggest a new direction for experimentally realizing the femtosecond soliton diode based on the cholesteric liquid crystals.Diode, which allows the nonreciprocal transportation of electric current, is one of the most important electronic devices in the integrated circuit. In optics, the nonreciprocal effect also plays a significant role in the modern information processing as well as in optically integrated devices. However, optical light beam is usually reciprocal and therefore how to transmit optical signal only in one direction and block that in the opposite direction remains a challenging issue.In the past decades, many schemes were proposed to solve this problem. The most significant proposal was based on the optical isolator realized by the Faraday effect in magneto-optical crystals [1]. Since the magneto-optical isolator requires a strong external pump, it hinders the applications in a highly integrated photonic systems. Other schemes were also reported with different principles or materials such as using optoacoustic effect [ [13,14] and parity-time system [15]. We note that although high nonreciprocal transmission ratio could be achieved using these schemes, the shape of the light field after propagating through the devices is usually neglected. Due to diffraction/dispersion as well as the interaction with materials, the light beam might cannot maintain its profile, which would limit the application in optical processing. Recently, linearly-coupled waveguide system in which the unidirectional propagation are expected in the nonlinear regime [16] was reported. Based on the fiber Bragg grating (FBG), a sandwich structure was proposed to realize optical nonreciprocal effect [17]. * Electronic address: yongyaoli@gmail.comWe should mention that with the consideration of optical nonlinearity, these optical waves [16,17] could maintain their profiles during propagation through the nonlinear devices. Indeed, the light wave propagating though these nonlinear systems is in a form of solitons which can preserve its shape during propagation [18][19][20][21][22][23][24][25].In this Letter, we extend the concept of optical diode from picosecond [17] to femtosecond (fs) domain for the first time, which is of particular interest in the ultrafast data processing. However, the realization of fs diode becomes more difficult than that realized in the pic...

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Ultrahigh-contrast-ratio silicon Fano diode

Cited by 68 publications

References 53 publications

Discrete soliton diode induced by synthetic gauge phase

Discrete soliton diode induced by synthetic gauge phase

Slow-light all-optical soliton diode based on tailored Bragg-grating structure

Femtosecond soliton diode on heterojunction Bragg-grating structure

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