All in One‐Chip, Electrolyte‐Gated Graphene Amplitude Modulator, Saturable Absorber Mirror and Metrological Frequency‐Tuner in the 2–5 THz Range
نویسندگان
چکیده
Layered 2D materials display unique optical and electrical properties that can enable manipulation, propagation, detection of electromagnetic waves over a broad spectral range, with high level control, offering the potential to activate different functionalities, by or means, in single chip. Here, compact optoelectronic device behaving as an amplitude modulator, saturable absorber mirror (SA mirror), frequency-tuner is conceived at terahertz (THz) frequencies. It comprises gate-tunable layer graphene (SLG), embedded quarter-wave cavity, operating 1–5 THz range. The use electrolyte ionic liquid gate ensures 40% modulation depth. Z-scan self-mixing interferometry reveals 60% reflectivity modulation, ≈4.5 W cm−2 saturation intensity. By integrating modulator/SA heterogeneous quantum cascade laser frequency comb, external cavity configuration, fine-tuning intermode beatnote also demonstrated. This opens intriguing perspectives for short pulse generation, phase-locking, tuning/chirping, phase metrological referencing, inter alia.
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ژورنال
عنوان ژورنال: Advanced Optical Materials
سال: 2022
ISSN: ['2195-1071']
DOI: https://doi.org/10.1002/adom.202200819