23 August 2017 An ultra-high contrast optical modulator with 30 dB isolation at 1.55 μm with 25 THz bandwidth
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Abstract
This paper presents a high-contrast electro-optical modulator with record-breaking amplitude modulation index of 27 dB and forward loss of < 3 dB at 1.5 μm. The high contrast is achieved by utilizing slit and surface plasmon polariton resonances in an array of gold lines filled with a phase change material (Germanium Telluride-GeTe). Stacking multiple layers of the phase change plasmonic grating enabled development of the high-index modulator in chip scale dimensions at telecommunication wavelength. Coupling the optical modes of multiple layers results in such a high contrast when GeTe goes through crystallographic phase transition. Phase transition through joule-heating is achieved by employing a matching circuit.
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Mohsen Jafari, Mina Rais-Zadeh, "An ultra-high contrast optical modulator with 30 dB isolation at 1.55 μm with 25 THz bandwidth", Proc. SPIE 10382, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI, 1038211 (23 August 2017); doi: 10.1117/12.2278918; https://doi.org/10.1117/12.2278918
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