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2 results

  • 1 - Introduction

  • Lukas Novotny, Eidgenössische Technische Hochschule Zürich, Bert Hecht, Julius-Maximilians-Universität Würzburg, Germany
  • Book:
    Principles of Nano-Optics
    Published online:
    31 October 2025
    Print publication:
    13 November 2025, pp 1-12

  • Summary

    This introductory chapter sets the stage for the research field of nano-optics. It introduces the fundamental concept of localizing light beyond the diffraction limit through the superposition of propagating and evanescent waves, emphasizing the critical role of evanescent waves. Additionally, it provides a historical overview of the key developments that have shaped nano-optics, and outlines the scope of the book.

  • 13 - Observational Methods

  • from Part I - Stellar Properties
  • Stan Owocki, University of Delaware
  • Book:
    Fundamentals of Astrophysics
    Published online:
    08 October 2021
    Print publication:
    03 June 2021, pp 82-88

  • Summary

    This chapter gives a brief overview of observational astronomy, using optical instruments and other wavelengths. We present a general formula for the increase in the limiting magnitude resulting from an increased telescope aperture. For light of particular wavelength, the diffraction from a telescope with a specific diameter sets a fundamental limit to the smallest possible angular separation that can be resolved.