Modeling of optical modulator based on silicon by using germanium antimony telluride (GST) nanolayer in elliptical cylindrical waveguide structure.
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| Title: | Modeling of optical modulator based on silicon by using germanium antimony telluride (GST) nanolayer in elliptical cylindrical waveguide structure. |
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| Authors: | Abdolghaderi, Senour1 (AUTHOR) s.abdolghaderi@kashanu.ac.ir, Nikoufard, Mahmoud1,2 (AUTHOR) mnik@kashanu.ac.ir |
| Source: | Optical & Quantum Electronics. Jul2026, Vol. 58 Issue 7, p1-18. 18p. |
| Subjects: | Optical modulators, Antimony telluride, Reversible phase transitions, Optical interconnects, Optical waveguides, Integrated optics, Optoelectronics |
| Abstract: | This study introduces a high-performance silicon-based optical modulator that utilizes a germanium-antimony-telluride (GST) nanolayer within an elliptical cylindrical waveguide structure. By exploiting the phase-change dynamics of GST and engineered hybrid and mode confinement, the device achieves an ultralow insertion loss of 0.15 dB, a remarkably high extinction ratio of 30.28 dB at a wavelength of 1550 nm for the fundamental mode. The elliptical geometry enhances light-matter interaction through anisotropic mode confinement while improving thermal management, enabling a data bit rate of via sub- dual-voltage electrothermal actuation (4 V for crystallization, 10 V for amorphization). The switch maintains high energy efficiency, consuming and calculated across the entire device volume. Multiphysics simulations validate the design: the tuned GST thickness () balances the switching speed and optical contrast, while gold electrodes enable localized Joule heating with minimal optical loss (). These advancements position the proposed modulator as a promising candidate for high-speed optical interconnects and programmable photonic circuits, addressing the critical demands for low-loss, high-contrast, and robust integrated photonics. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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