The book "Progress in Nano-Electro-Optics I" offers a comprehensive examination of the fundamental aspects of nano-electro-optics. It begins with a detailed analysis of fiber samples and related devices used for the efficient and high-resolution generation and detection of the optical near field. The discussion then moves on to the modulation of an electron beam by optical near fields. Additional topics include fluorescence spectroscopy, where molecules are excited by the evanescent surface plasmon field near metallic surfaces, as well as spatially resolved near-field photoluminescence spectroscopy of semiconductor quantum dots, which will be central to future electro-optical devices and systems. Finally, the quantum mechanics of the optical near field is discussed, addressing all essential features of the interaction between optical near fields and nanomaterials, atoms, and molecules. This book serves as a valuable resource for engineers and scientists working in the field of nano-electro-optics.