Non-volatile Optical Switch Based on a GST-Loaded Directional Coupler

Zhang, Hanyu; Zhou, Linjie; Lu, Liangjun; Chen, Jianping; Rahman, B. M. A.

doi:10.1109/ogc.2018.8529888

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Therefore, GST provides a real tunable structure with switching capability under circumstances, explained in the following. Moreover, the refractive index of GST is almost constant in the range of 1400 to 1900 nm [33,34], which helps the reliability of our simulation results.…”

Section: Structure Design Simulation Results and Discussionsupporting

confidence: 62%

Sensing and switching capabilities of a tunable GST-based perfect absorber in near-infrared region

Nejat

Nozhat

2020

J. Phys. D: Appl. Phys.

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In this paper a GST-based perfect absorber is investigated for sensing applications. The simulation results show the high sensitivity and figure of merit of 900 nm per refractive index unit (RIU) and 15 RIU−1, respectively. The sensing parameters are also studied for different biomedical applications such as detection of glucose in water, malaria infection, bacillus bacteria, and cancer cells. The phase change material GST makes the structure tunable and switchable by changing the phase through different annealing temperatures. By changing temperature, the optical characteristics of GST are altered and so the perfect absorption can be tuned at different near-infrared wavelengths. Moreover, the sweep between the amorphous and crystalline states of GST results in switching capability with the high extinction ratio of 13.97 dB at λ = 1724 nm. Therefore, the perfect tunable absorber supports our new idea of multi-application plasmonic devices with two capabilities of sensing and switching, simultaneously. Also, the E-field distributions and analytical method of equivalent circuit model are utilized to verify the simulation results and demonstrate a better insight of the proposed structure performance. The polarization independency of the proposed structure, tunability, good sensing and switching performances are some other benefits of our proposed structure, which can pave the way for development of new investigations about the phase change material applications in plasmonic studies.

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Section: Structure Design Simulation Results and Discussionsupporting

confidence: 62%

Sensing and switching capabilities of a tunable GST-based perfect absorber in near-infrared region

Nejat

Nozhat

2020

J. Phys. D: Appl. Phys.

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Wideband polarization-independent plasmonic switch based on GST phase-change material

Heidari

Nozhat

2022

Appl. Opt.

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Chalcogenide phase-change materials such as germanium-antimony-tellurium (GST) are suitable materials for use in tunable plasmonic devices. In this paper, a wideband plasmonic switch consists of gold cross-shaped resonators has been designed and simulated in the near-infrared region. The phase-change material GST makes the structure tunable, and by changing the temperature and switching between amorphous and crystalline states, the best extinction ratio of 14 dB and response time of 46 fs have been obtained at the wavelength of 1228 nm. The equivalent circuit model of the suggested structure has been extracted to verify the numerical results. Moreover, the effects of polarization and incident angles and geometric parameters on the structure performance have been evaluated. The proposed tunable and wideband switch with good switching capability can be used in various optical devices such as modulators, logic gates, and optical integrated circuits.

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Non-volatile Optical Switch Based on a GST-Loaded Directional Coupler

Cited by 2 publications

References 9 publications

Sensing and switching capabilities of a tunable GST-based perfect absorber in near-infrared region

Sensing and switching capabilities of a tunable GST-based perfect absorber in near-infrared region

Wideband polarization-independent plasmonic switch based on GST phase-change material

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