Integrating Triply‐ and Singly‐Bent Highly Flexible Crystal Optical Waveguides for Organic Photonic Circuit with a Long‐Pass‐Filter Effect

Abstract

Fabrication of organic photonic integrated circuits (OPICs) greatly relies on crystalline materials with high mechanical flexibility and fluorescence (FL). Realizing an efficient OPIC with multiple photonic functions suitable for practical applications depends on creating complex circuit architectures. The mechanical and optical functions of crystals are susceptible to subtle differences in the molecular packing and, more importantly, the type of intermolecular interactions. Herein, an organic crystal (E)‐1‐(4‐(iodo)phenyl)iminomethyl‐2‐hydroxyl‐naphthalene (IPIN) exhibiting high flexibility under mechanical stress, bright green FL, and selective self‐absorbance of the blue part of its broadband FL signal is reported. IPIN microcrystal transduces its FL effectively even in its bent geometry. The significant crystal‐surface adhesion energy facilitates the micromechanical fabrication of a triply‐bent waveguide using a mechano(crystal)photonic approach, which is later integrated with a singly‐bent waveguide to create a unique OPIC. This futuristic OPIC delivers excitation position‐dependent and direction‐specific long‐pass‐filtered narrowband optical signals with different split ratios.

Low‐Dimensional Organic Crystals: From Precise Synthesis to Advanced Applications

“…[170][171][172] Recently, Chandrasekar et al proposed a mechanical micromanipulation approach for the construction of organic photonic integrated circuits from flexible crystals. As shown in Figure 10a, they used atomic force microscopy (AFM) to bend, cut, move, and slice the crystals, [173][174][175][176] ultimately combining multiple crystals and achieving the evolution from a single structure to a complex crystal structure; such a technique provides an ideal material basis for the construction of organic photonics circuits. Indeed, Chandrasekar et 10b).…”

Exploring Axial Organic Multiblock Heterostructure Nanowires: Advances in Molecular Design, Synthesis, and Functional Applications

“…Organic low‐dimensional nanomaterials [ 1–7 ] have attracted much attention in recent years because of their promising applications in the field of optoelectronics including organic light‐emitting devices, [ 8,9 ] organic solid‐state lasers, [ 10–12 ] organic field‐effect transitions, [ 13 ] perovskite solar cells, [ 14 ] optical filters and circuits. [ 15–20 ] Furthermore, their outstanding compatibility and easy processability enable a fine topological control of both composition and geometry, thereby exhibiting excellent physicochemical features. [ 21–23 ] Among the organic low‐dimensional nanomaterials, organic 1D nanowires are considered promising candidates for optoelectronic applications, due to their distinctive size‐dependent confinement effect for photons or electrons, [ 24–26 ] which could provide good charge transport properties and photonic performances.…”

Integrating Low‐Temperature‐Resistant Two‐Dimensional Elastic‐Bending and Reconfigurable Plastic‐Twisting Deformations into an Organic Crystal

“…Interestingly, mechanical‐stress‐induced rolling of naturally twisted crystals with elasticity has recently been used to rotate polarization light [29] . As compared to hard and brittle crystalline materials, the optical transmission path of elastically bendable crystals can be controlled to a certain curvature [37–41] . To improve the spatial controllability of crystalline optical waveguide outputs, 2D elastic‐bending capability is required for organic crystals.…”