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• W3014459579 abstract "We propose a reconfigurable and non-volatile Bragg grating in the telecommunication C-band based on the combination of novel low-loss phase-change materials (specifically Ge 2 Sb 2 Se 4 Te 1 and Sb 2 S 3 ) with a silicon nitride platform. The Bragg grating is formed by arrayed cells of phase-change material, whose crystallisation fraction modifies the Bragg wavelength and extinction ratio. These devices could be used in integrated photonic circuits for optical communications applications in smart filters and Bragg mirrors and could also find use in tuneable ring resonators, Mach–Zehnder interferometers or frequency selectors for future laser on chip applications. In the case of Ge 2 Sb 2 Se 4 Te 1 , crystallisation produces a Bragg resonance shift up to ∼ 15 nm, accompanied with a large amplitude modulation (insertion loss of 22 dB). Using Sb 2 S 3 , low losses are presented in both states of the phase change material, obtaining a ∼ 7 nm red-shift in the Bragg wavelength. The gratings are evaluated for two period numbers, 100 and 200 periods. The number of periods determines the bandwidth and extinction ratio of the filters. Increasing the number of periods increases the extinction ratio and reflected power, also narrowing the bandwidth. This results in a trade-off between device size and performance. Finally, we combine both phase-change materials in a single Bragg grating to provide both frequency and amplitude modulation. A defect is introduced in the Sb 2 S 3 Bragg grating, producing a high quality factor resonance ( Q ∼ 10 4 ) which can be shifted by 7 nm via crystallisation. A GSST cell is then placed in the defect which can modulate the transmission amplitude from low loss to below -16 dB." @default.
• W3014459579 created "2020-04-10" @default.
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• W3014459579 date "2020-05-15" @default.
• W3014459579 modified "2023-10-16" @default.
• W3014459579 title "On-chip sub-wavelength Bragg grating design based on novel low loss phase-change materials" @default.
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• W3014459579 doi "https://doi.org/10.1364/oe.389598" @default.
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