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Narrow-core hollow optical waveguide with nanostructured SOI as ultra-low loss platform for efficient photodetection

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Abstract

A nanostructured hollow optical waveguide based on high-index contrast grating (HCG) embedded SOI is proposed. An ultra-low propagation loss of 1.22 dB/m even at narrow, 1-\(\upmu \)m thick, air-core is reported. A high-performance photodetection is realized by the introduction of hollow core in form of intrinsic region in the photodetection (PIN) layer within HCG-assisted narrow-core waveguide. A sufficiently high responsivity of 0.8 A/W and quantum efficiency of 64% are obtained at 1550-nm which is possible because of the presence of surface modes within HCG which get coupled in the photodetection layer leading to a strong optical confinement in that layer. High reflectivity, small penetration length and coupling of lateral surface modes in HCG make it possible to offer improved waveguiding and hence photodetection.

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Authors and Affiliations

  1. Optoelectronics Research Laboratory, Department of Electronics and Communication Engineering, Thapar University, Patiala, Punjab, 147004, India

    Varun Kumar & Harpinder Kaur

  2. Optoelectronic Nanodevice Research Laboratory, Indian Institute of Technology (IIT), Indore, India

    Mukesh Kumar

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  1. Varun Kumar
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  2. Harpinder Kaur
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  3. Mukesh Kumar
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Correspondence to Mukesh Kumar.

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Kumar, V., Kaur, H. & Kumar, M. Narrow-core hollow optical waveguide with nanostructured SOI as ultra-low loss platform for efficient photodetection. Photon Netw Commun 34, 241–247 (2017). https://doi.org/10.1007/s11107-017-0687-y

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  • DOI: https://doi.org/10.1007/s11107-017-0687-y

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