Broadband 2 × 2 multimode interference coupler for mid-infrared wavelengths.
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2021
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Stirling, Callum J
Halir, Robert
Sánchez-Postigo, Alejandro
Qu, Zhibo
Reynolds, Jamie D
Penadés, Jordi Soler
Senthil Murugan, Ganapathy
Ortega-Moñux, Alejandro
Wangüemert-Pérez, J Gonzalo
Molina-Fernández, Íñigo
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Abstract
Beam splitters are core components of photonic integrated circuits and are often implemented with multimode interference couplers. While these devices offer high performance, their operational bandwidth is still restrictive for sensing applications in the mid-infrared wavelength range. Here we experimentally demonstrate a subwavelength-structured 2×2 multimode interference coupler with high performance in the 3.1-3.7µm range, doubling the bandwidth of a conventional device.