Journal ArticleDOI
Design and Simulation of Compact Optical Modulators and Switches Based on Si–VO2 –Si Horizontal Slot Waveguides
TLDR
In this paper, a horizontal slot Si-VO2-Si optical waveguide is proposed and its optical properties are investigated, and it is shown that the effective index and the propagation loss of the proposed waveguide undergo substantial changes upon the VO2 transition from insulating to metallic phase.Abstract:
In this paper, a horizontal slot Si–VO2–Si optical waveguide is proposed and its optical properties are investigated. Numerical simulation results show that the effective index and the propagation loss of the proposed waveguide undergo substantial changes upon the VO2 transition from insulating to metallic phase. The effective index and the propagation loss variations of the proposed waveguide are then maximized by optimizing waveguide dimensions. It is shown that 0.226 change in the effective index (Δ n eff = 0.226) and 30 dB/ μ m change in the propagation loss (Δ l dB = 30 dB/μm) are achievable using the optimum dimensions. These extraordinary variations in waveguide properties recommend the proposed waveguide as an excellent candidate for optical active device realization. To investigate these applications, performance parameters of the proposed waveguide are further studied in terms of the transition speed and the power consumption. In these studies, the VO2 phase transition is assumed to be actuated by applying an electric field. Two examples of optical active devices based on the proposed waveguide are then presented: an electro-absorption modulator and a 1 × 2 directional coupler optical switch. Finite-difference time-domain simulation of the proposed devices shows very high extinction ratio of 21 dB along the ultrasmall propagation length of 1 μ m, for the proposed electro-absorption modulator, and high extinction ratios of ∼18.5 dB and ∼8.6 dB in off - and on -state of the proposed 1 × 2 switch, which has very small length of ∼6 μ m. Further simulations also show interesting properties of the proposed devices in terms of the power consumption, insertion loss, and bandwidth.read more
Citations
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Journal ArticleDOI
Optical phase change materials in integrated silicon photonic devices: review
TL;DR: In this paper, the potential of integrating optical phase change materials (O-PCMs) in integrated silicon photonic devices is explored for a variety of photonic applications due to the extraordinarily large changes in optical properties that occur during electronic and/or structural phase transitions.
Journal ArticleDOI
Silicon waveguide optical switch with embedded phase change material.
TL;DR: This work designs, fabricate, and characterize a hybrid Si-PCM optical switch, and achieves ~10 dB broadband optical contrast with a PCM length of 500 nm using thermal actuation by integrating vanadium dioxide within a Si photonic waveguide.
Journal ArticleDOI
Silicon waveguide modulator with embedded phase change material
TL;DR: In this article, a hybrid Si-PCM optical modulator was proposed by integrating vanadium dioxide (a PCM) within a Si photonic waveguide, in a non-resonant geometry.
Journal ArticleDOI
Mid-infrared hybrid Si/VO2 modulator electrically driven by graphene electrodes
TL;DR: An ultra-compact high-speed hybrid Si/VO2 modulator operating at a mid-IR wavelength of 3.8 μm is presented, and the thermal characteristics of graphene are employed to improve the response time of the VO2 phase transition through speed up heating and dissipation processes, thus enhancing the modulation speed.
Journal ArticleDOI
Ultra-wideband multi-level optical modulation in a Ge2Sb2Te5-based waveguide with low power consumption and small footprint
TL;DR: In this paper, a Ge2Sb2Te5 (GST)-based four-level pulse amplitude modulation (PAM4) scheme is proposed and its optical and electrical properties are studied.
References
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All-optical high-speed signal processing with silicon–organic hybrid slot waveguides
Christian Koos,Christian Koos,P. Vorreau,Thomas Vallaitis,Pieter Dumon,Wim Bogaerts,Roel Baets,Bweh Esembeson,Ivan Biaggio,Tsuyoshi Michinobu,François Diederich,Wolfgang Freude,Juerg Leuthold +12 more
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