Influence of refractive profile shape on the distribution of modal attenuation in planar structures with absorption cover

Applications of Gradient Index Multimode Interference Structures in the Technology of Optical Sensor

“…The expression on modal attenuation coefficient γ TE m of TE modes of the order m can be expressed by the equation [10,11]:…”

Planar Evanescent Wave Ammonia Sensor - Influence of Refractive Index Profile on Sensor Properties

“…Monomode planar uniform waveguides can be obtained with the application of plasma-enhanced vapour deposition (PECVD) [10], low-pressure chemical vapour deposition (LPCVD) [11], metal organic chemical vapour deposition (MOCVD) [12], pulsed laser deposition (PLD) [13] or sol-gel technology [3][4][5][6][7][8][14][15][16][17][18]. Planar waveguides of great modes quantity can be fabricated by ion exchange in glasses [19][20][21][22][23][24][25][26]. Such waveguides are particularly suitable for applications in technology of evanescent wave chemical sensors with amplitude modulation.…”

“…We widely discussed the influence of the refractive index shape on distribution of modal attenuation in ion-exchange waveguides with absorptive covers in Refs. [21][22][23][24][25][26].…”

Influence of the Heating Processes on the Modal Attenuation Distribution in Planar Gradient Waveguides

“…This effect occurs in mode's evanescent field interaction with the surroundings of an optical fibre. It could be considered in two ways: through the direct contact of waveguide's surroundings (change of its absorption) with the structure itself or in more indirect way through the absorption changes of the sensor layer covering the optical waveguide [1][2][3]. This kind of sensor structures can be constructed on optical fibres.…”