Measurement of guided light-mode intensity: An alternative waveguide sensing principle

Abstract

An alternative transduction mechanism for planar optical waveguide sensors is reported. Based on a simple measurement of the mode intensity, the presented transduction is an interesting alternative to the conventional mode-angle transduction, because the expensive, high-precision angular rotation usually employed may be avoided.

Nonlinear planar asymmetrical optical waveguides for sensing applications

“…Horvath et al [7,11,12] index of the aqueous cladding is higher than that of the substrate material. The reverse symmetry waveguide has been tested for bacterial and cell detection and it showed a considerably high sensitivity compared with the conventional waveguide sensor.…”

Sensitivity enhancement of metal clad planar waveguide sensor using metamaterial layer as a guiding layer

“…Currently, biosensors are paramount tools in the investigation of biological phenomenon and have importance in many areas, such as disease diagnostics, environmental monitoring and food safety [1][2][3][4][5][6][7][8][9][10][11]. Optical fiber based biosensors are the epicenter of an extensive research work in the past few years [6,[12][13][14].…”

Vertical input transverse resonant cavity device structure for surface refractive index variation sensor

“…In our scheme a resonant cavity is used to further enhance the sensitivity. A resonant waveguide grating [5][6][7][8] is another technology that does not require precious metal for surface refractive index measurement. The input-output ports are in the vertical direction enabling easy access to the device.…”