Waveguide-based photonic sensors provide a unique combination of high sensitivity, compact size and label-free, multiplexed operation. Interferometric configurations furthermore enable a simple, ...fixed-wavelength read-out making them particularly suitable for low-cost diagnostic and monitoring devices. Their limit of detection, i.e., the lowest analyte concentration that can be reliably observed, mainly depends on the sensors response to small refractive index changes, and the noise in the read-out system. While enhancements in the sensors response have been extensively studied, noise optimization has received much less attention. Here we show that order-of-magnitude enhancements in the limit of detection can be achieved through systematic noise reduction, and demonstrate a limit of detection of ∼ 10 - 8 RIU with a silicon nitride sensor operating at telecom wavelengths.
We are developing a silicon nitride photonic integrated circuit to replace dichroic mirrors, acousto-optic tunable filters and fiber switches inside a multi-color laser engine aimed towards ...fluorescent microscopy and flow cytometry. Both the application space and design aspects will be discussed.
Integrated photonic biosensors have demonstrated low bulk detection limits down to 10 −7 refractive index units. Nevertheless, most rely on expensive optical sources, such as DFB lasers. Here, we ...experimentally demonstrate that with adequate sensor design comparable detection limits are achievable with a low-cost Fabry-Perot laser.
Silicon photonics enables sensitive and label-free optical biosensors for the detection of chemical and biological substances. Different sensing architectures have been used to improve the limit of ...detection and increase the dynamic range response. Here, we show experimental limit of detection at state-of-the-art level using silicon nitride integrated Mach-Zehnder interferometers with coherent read-out. These preliminary results are concordant with theoretical results, showing that the proposed approach enables the use of simple read-out equipment using low-cost laser sources.
We report on our advances on the use of subwavelength metamaterials for silicon photonic devices, including narrowband filters, antennas, polarization handling, on-chip beam forming and sensing.
Subwavelength structures are enabling a host of high-performances devices in the silicon photonic platform. Here we review our progress in the field, with an emphasis on the auspicious anisotropic ...properties of these structures for applications ranging from broadband on-chip GRIN-lenses, to zero-birefringence waveguides and polarization splitters.
High performance silicon photonic devices based on practical metamaterials Halir, Robert; Luque-Gonzalez, Jose M.; Sanchez-Postigo, Alejandro ...
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC),
2019-July
Conference Proceeding
Odprti dostop
Subwavelength grating metamaterials are enabling a new generation of high-performance silicon photonic devices. Here we discuss the fundamental physics along with some of the latest advances in this ...rapidly expanding field.
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