Race‐Track Type Resonator Integrated Active Add‐Drop Filter from Flexible Organic Crystals: Experiments and Numerical Calculations

The success of silicon photonics stems from the ability to design, simulate, and construct optical components and their optical performance simultaneously. However, poor mechanical compliance of Si‐based materials demands alternative photonic materials. The recent development of mechanically flexible organic waveguides as reliable photonic material platform is quite promising. Herein, the design and fabrication of a race‐track type resonator based add‐drop filter (ADF) from elastically bendable 9,10‐dibromoanthracene (DBA) crystals are reported. The elastic DBA microcrystals exhibit pseudo‐plasticity on a substrate facilitating the fabrication of race‐track type resonator and ADF via mechanophotonics technique. Photonic investigations of the circuit reveal its spectral filtering ability. These experimental observations confirmed by FDTD modelling support the unique abilities of organic optical elements for photonic device applications. Mechanical manipulation of single crystals provides an organic race‐track type resonator integrated add‐drop filter. The circuit transmits a mixed mode corresponding to individual optical elements with the intensity modulation, and also a few new modes as output signals. Finite difference time domain calculations offer deeper insight into the coupling between the optical elements at different crystal edge contacts.