Recent Advances in Optical Biosensors for Sensing Applications: a Review

Recent advances of biosensors on microneedles

“…The optical biosensor utilizes optical signals to interpret data relating to an organism. 76 It employs a range of signals, such as fluorescence, reflected light, absorbed light, scattering, and interference. The different types of optical sensors include surface-enhanced Raman spectroscopy sensors, colorimetric sensors, and fluorescence sensors.…”

A theoretical approach for a new design of an ultrasensitive angular plasmonic chemical sensor using black phosphorus and aluminum oxide architecture

“…Meanwhile, SPR designs provide significant contributions through the detection and monitoring in many medical and chemical applications such as, bacteria, RNA, DNA, gases, medical diagnostics, and food technology. 1–4 In particular, SPR-based biosensors are versatile and highly sensitive sensors due to their label-free platform, and stable and real-time detection capabilities. 4 In most of the SPR sensors, a sample either in the solid or liquid state is examined directly without processing the sample further before examination based on the attenuated total reflection (ATR).…”

“…1–4 In particular, SPR-based biosensors are versatile and highly sensitive sensors due to their label-free platform, and stable and real-time detection capabilities. 4 In most of the SPR sensors, a sample either in the solid or liquid state is examined directly without processing the sample further before examination based on the attenuated total reflection (ATR). 5 In the ATR technique, the surface plasmon waves are stimulated along the interface between the metal and the dielectric layers of the structure due to collective oscillations of free electrons at their interfaces.…”

A surface plasmon resonance nanostructure containing graphene and BaTiO 3 layers for sensitive defection of organic compounds

“…It was shown that adding a graphene layer to the SPR sensor structure can improve the tuning range and sensitivity [19] as a protection layer to the plasmonic metal from oxidation and this can lead to more stability of the performance. Typically, two-dimensional/TMD heterostructures or Perovskite materials are employed in metal prism-based biosensors [20][21][22][23][24][25]. The twodimensional nanomaterial BaTiO 3 is a desirable option for thin-film electro-optic switches because it has substantial electro-optical coefficients [26].…”