An Extremely Pseudo‐Plastic, Organic Crystal‐Based Concentric‐Ring‐Resonator Coupled Optical Waveguide

• Published in: Advanced Physics Research Vol. 4; no. 1
• Main Authors: Kumar, Avulu Vinod, Manoharan, Deepak, Khapre, Ankur, Ghosh, Soumyajit, Chandrasekar, Rajadurai
• Format: Journal Article
• Language: English
• Published: Edinburgh John Wiley & Sons, Inc 01.01.2025; Wiley-VCH
• Subjects: atomic force microscopy; Chemical bonds; Crystals; Dibromophenol; Fabrication; Flexibility; Geometry; Hydrazines; Hydrogen bonding; interferometry; Lasers; Light; Mechanical properties; mechanophotonics; Microcrystals; Morphology; optical filter; Optical filters; optical waveguide cavity; Optical waveguides; Organic crystals; Photonics; pseudo‐plastic organic crystals; Resonators; Single crystals; Spectrum analysis; Wavelengths
• ISSN: 2751-1200; 2751-1200
• DOI: 10.1002/apxr.202400075

The precise shaping of optical waveguides is crucial for advancing photonic circuit technologies. In this study, the first fabrication of a resonator is introduced with coiled circular geometry(CCG) using pseudo‐plastic microcrystals of 6,6′‐((1E,1′E)‐hydrazine‐1,2‐diylidenebis(methaneylylidene))bis(2,4‐dibromophenol), HDBP. The molecular packing supported by type‐II inter‐molecular halogen bonding and hydrogen bonding provides an exceptional strain‐holding capacity for HDBP crystals. This property enables the creation of compact CCGs with three interconnected turns utilizing an atomic force microscopy cantilever tip‐based mechanophotonics technique. This CCG acts as a concentric ring‐resonator (CRR) that splits and routes light in clockwise and anticlockwise directions along circular turns, providing optical interference. Subsequently, an HDBP optical waveguide is integrated with the CRR, resulting in the development of the organic crystal‐based optical filter. The modulation observed in optical modes’ wavelengths and their intensities in the waveguide when coupled with CRR shows optical filter functionality. This fabricated device holds promise for applications in high‐fidelity sensing, precision micro‐measurements, and optical quantum processing technologies, showcasing the potential of organic crystals in advancing photonics. The fabrication of concentric ring resonators featuring coiled circular geometries is presented. These resonators are seamlessly integrated with straight waveguides, showcasing their application as efficient optical filters.