[Show abstract][Hide abstract] ABSTRACT: Optical field distributions around individually fabricated subwavelength scatterers mapped with a photon scanning tunneling microscope are presented. The photonic structures are produced from ridge waveguides using focused-ion-beam milling. This flexible technique allows us to make single holes and slits of sizes down to 30 nm. A quantitative analysis of the observed optical pattern due to interference between incoming and reflected light yields insight about subwavelength scatterers in waveguides. We conclude that light scattering into high-loss modes of the waveguide occurs.
[Show abstract][Hide abstract] ABSTRACT: Summary form only given. We present an investigation of local optical field distributions inside low-dimensional photonic crystals with a scanning tunnelling microscope (STM). Channel waveguides form the basis for our photonic crystals. We have modified the waveguides by means of focused ion beam sputtering.
[Show abstract][Hide abstract] ABSTRACT: In periodic structures photons can be made to behave like electrons. This results in the opening of a so called "photonic stop gap", a range of forbiddden optical frequencies that cannot exist inside the material. To investigate such photonic materials on the nanoscale we will use state-of-the art scanning probe technologies. This allows us to map the optical field distribution and the phase of the light simultaneously with the topographical information of the structure. Such measurements on photonic materials will complement standard investigation methods, such as in/output measurements. Our ultimate goal is to find out what happens to an excited individual molecule located inside the photonic materials, when it "wants" to fluoresce at a forbidden frequency in the gap. Will it emit a photon, yes or no?