Waveguide Sensors with Periodic Structures.- Nano-structured Silicon Optical Sensors.- Resonant Waveguide Grating Biosensor for Microarrays.- Resonant Biochemical Sensors Based on Photonic Bandgap Waveguides and Fibers.- Nanophotonic and Subwavelength Structures for Sensing and Biosensing.- Optical-Fiber Sensors.- Fiber-Optic Chemical and Biosensors.- Applications of Fiber Gratings in Chemical and Biochemical Sensing.- Hollow-Optical Fiber Probes for Biomedical Spectroscopy.- Hollow-Waveguide and Micro-Resonator Sensors.- Liquid-Core Waveguide Sensors.- Capillary Waveguide Biosensor Platform.- Label-Free Optical Ring Resonator Bio/Chemical Sensors.- Terahertz Biosensing.- Terahertz-Biosensing Technology: Progress, Limitations, and Future Outlook.- Erratum.