Compact Photonic SOI Sensors

Effect of Dispersion-Enhanced Sensitivity in a Two-Mode Optical Waveguide with an Asymmetric Diffraction Grating

“…Silicon photonics [ 1 , 2 , 3 , 4 , 5 , 6 ] are promising technologies with huge potential for the mass production of modern optical elements and functional systems based upon them. Optical sensors [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ] are among the most popular components of information technologies systems that are manufactured, among other things, on the basis of silicon photonics and nanotechnologies. For example, over the past 10 years, 20% of all publications on sensors have been based on silicon photonics technologies, and 20% of publications on silicon photonics are devoted to optical sensors [ 13 ].…”

“…The main factors influencing the scale of optical sensor application include the sensitivity (S), intrinsic limit of detection (iLOD), and manufacturability. Sensor research is conducted in the most developed countries, and, in recent years, various types of sensors with very high technical parameters have been developed using various design solutions and the highly advanced technologies [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. There is also a fundamental possibility of increasing optical sensor sensitivity by using two-mode optical waveguides in which bimodal interaction is implemented [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”

“…The current state of research on this issue has been analyzed in detail in many reviews [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. In particular, the optical properties of the waveguide mode depend on the refractive index of the surrounding medium n c , for example, a liquid, and its effective refractive index changes with a change in the wavelength, λ 0 , and the refractive index of the latter, N i = N i (n c , λ 0 ).…”

Numerical Simulation of Optical Sensing by the Far Field Pattern Radiated by Periodic Grating Strips Over Silica Buffer on the Silicon Wire Waveguide

“…These sensors utilize different arrangements [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ] for reading signals. Among them, a lot of optical sensors use wavelength interrogation based on high precision measuring of the shift in resonance wavelength in the photonic structure, and the value depends on the environment of the sensor element [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Wavelength interrogation can be accomplished using a tunable laser with a fine linewidth or by launching the optical beam into the waveguide, which contains a broad wavelength spectrum, say, from the super-luminescence diode, and measuring the transmitting signal by the optical spectrum analyzer (OSA).…”

“…Wavelength interrogation can be accomplished using a tunable laser with a fine linewidth or by launching the optical beam into the waveguide, which contains a broad wavelength spectrum, say, from the super-luminescence diode, and measuring the transmitting signal by the optical spectrum analyzer (OSA). Both these variants provide the possibility to develop advanced optical sensors [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ] with the sensitivity depending on the design of the optical element and the spectrum resolution of the tunable laser or the OSA. Both readout schemes are rather costly, which prevents the wide spread of these sensor technologies.…”