Four-Port Resonant Tunnelling Bottle Microresonator Device

Abstract

The phenomenon of resonant tunnelling has attracted significant interest due to its intriguing underlying physics and multidisciplinary applications in the theory of nuclear reactions [1], electron propagation through semiconductor devices, quantum wire and quantum dot structures [2, 3], as well as propagation of light through optical microresonators [4–6]. The applications of resonant tunnelling phenomenon in microresonator photonics is of special interest. The simplest photonic device exhibiting resonant tunnelling behaviour consists of an optical microresonator and two semi-infinite waveguides separated from the microresonator by effective potential barriers, which can be fabricated inside the photonic crystals. In order to observe a similar type of resonant tunnelling in a whispering gallery mode microresonator, the latter should be evanescently coupled to two microfibers, i.e., present a four-port device [5, 6].