2D Optical Waveguides Based on Hierarchical Organic Semiconductor Single Crystals

Abstract

Toward the evolution of integrated optoelectronic circuits, it is vital matter to realize 2D optical waveguide at micro/nanoscale. However, due to the waveguiding principle of the traditional dielectric waveguide, the transverse and longitudinal dimensions cannot be greatly reduced, thus the size of photonic apparatus is far from reaching the size level for the microelectronic device. Therefore, it is difficult to achieve a high‐level hybrid integration of integrated optical path and microelectronic circuit. However, the organic crystals with polygonal structure and hierarchical structure as the medium also can form optical waveguide by confining photons/electrons at the micro/nanoscale along different directions, and these organic microcrystals can be well applied into the ultracompact optoelectronic devices. Herein, the fabrication of organic crystals as the medium of 2D optical waveguide is briefly introduced, as well as the 2D optical waveguide phenomenon existing in these polygonal and hierarchical microcrystals. Moreover, a conclusion is drawn and expectations are expressed for the 2D optical waveguide based on organic microstructure in the near future.

New insights into structure/optical waveguide behavior relationships in linear bisethynylbenzenes

“…Over the last decade, several organic structures have been widely studied and reported in the literature. [26][27][28][29][30][31] In recent years, research in this field has focused on new challenges, aiming at improving the transmission information and achieving the implementation in real devices. For this reason, new structures with improved properties have been described, among which it is worth mentioning homo/heterostructures, 32,33 core/ shell structures, 34 architectures combining the active/passive waveguide behavior, 35 branched nanowire heterostructures (BNwHs), 36 an integrated optoelectronic device called organic field-effect waveguide (OFEW), 37 and structures with promising properties such as flexibility, 38 anisotropy 39,40 and chirality.…”

Two-Dimensional Hybrid Perovskitoid Micro/nanosheets: Colorful Ultralong Phosphorescence, Delayed Fluorescence, and Anisotropic Optical Waveguide

“…To the best of our knowledge, the 2D geometry of the micro/nanosheets could confine the light to propagate at the micro/nanoscale along different directions. 51 To verify the 2D optical waveguide behavior, spatially resolved PL imaging was performed along different directions within the 2D microsheet. As shown in the images (Figure S18), with the propagation distance increase, the luminous intensity of the excited point remained unchanged, while the luminous intensity decreased gradually at the tips, which can be assigned to the activated waveguides.…”

“…Under the condition of dark field, spatially resolved PL imaging associated with the selected region can be captured through gradually changing irradiation point of the excitation light by the laser beam (375 nm). To the best of our knowledge, the 2D geometry of the micro/nanosheets could confine the light to propagate at the micro/nanoscale along different directions . To verify the 2D optical waveguide behavior, spatially resolved PL imaging was performed along different directions within the 2D microsheet.…”

Recent Development of Photoresponsive Liposomes Based on Organic Photosensitizers, Au Nanoparticles, and Azobenzene Derivatives for Nanomedicine

“…Under the irradiation of NIR-II at 1064 nm, the temperature of the liposome solution increased to 50 °C and the photothermal effect showed good controllability under four cycles of intermittent illumination. Use of photoresponsive liposomes with composite response capability and composite systems of various photoresponsive materials. − More response ability could make liposomes have wider adaptability. Especially in the content related to Au nanoparticle liposomes, the emergence of alloy and composite materials − is a trend that could not be ignored. For instance, electrostatically bonded complexes of Au nanoparticles and organic photosensitizers could exponentially increase ROS yields. , Ag nanoparticles also have certain antibacterial and photothermal effects.…”