Optical biosensor based on a cladding modulated grating waveguide

4-(Triethoxysilyl)butanoic acid as a self-assembled monolayer for surface modification of titanium dioxide

“…The resolution of the surface plasma resonance biosensor was 2.20 × 10 −6 RIU, and those of the dual-slot waveguide biosensor and slot-waveguide biosensor were 2.60 × 10 −6 RIU and 4.20 × 10 −5 RIU, respectively. 24,25 , 34 The resolution of the Mach–Zehnder interferometer biosensor was found to be 1.44 × 10 −6 RIU. 26 It can be seen that the resolution of the DGB proposed in this study is comparable to that of most optical biosensors.…”

Small Footprint and High Extinction Ratio Cladding-Modulated Bragg Grating Structure as a Wideband Bandstop Filter

“…As light traverses the waveguide, the orchestrated cladding modulation dynamically interacts with the core, exerting an influence on the effective refractive index experienced by guided modes. This intricate interplay engenders dynamic changes in the effective index, bestowing precise control over the Bragg condition and, consequently, the reflective properties of the grating [20]. This design innovation underscores the perpetual evolution of BG waveguides, highlighting their adaptability in addressing a myriad of optical engineering challenges [21].…”

“…The cladding-modulated BG waveguide stands as a pioneering advancement in the field of integrated optics, departing from the conventional structure of a core material enveloped by cladding layers [16][17][18]. In this innovative strategy, deliberate modulation of the cladding refractive index along the waveguide's length introduces a novel mechanism for precisely manipulating light within its confines [19,20]. As light traverses the waveguide, the orchestrated cladding modulation dynamically interacts with the core, exerting an influence on the effective refractive index experienced by guided modes.…”

“…In [20], a photonic biosensor featuring a grating waveguide with cladding modulation, composed of three channels on a silicon-on-insulator (SOI) platform, is proposed. The optical mode propagates in the central channel, while the remaining two channels engage with the lateral field.…”

Temperature-Insensitive Ferrofluid-Clad Microfiber Bragg Grating for Magnetic Field Sensing

“…Bragg gratings have been widely applied in the rapidly growing field of optical sensors [15][16][17][18]. As one of most popular sensing elements fiber Bragg grating (FBG) can measure a series of physical quantities including temperature [19], humidity [20], pressure [21], strain [22], etc.…”