Article
Materials Science, Multidisciplinary
Avulu Vinod Kumar, Rajadurai Chandrasekar
Summary: The study demonstrates the design and synthesis of an extremely flexible organic crystal and its application in a novel interferometer. The crystal exhibits bending geometry-dependent optical properties, making it useful for manufacturing miniature photonics devices beyond traditional fabrication methods.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jada Ravi, Avulu Vinod Kumar, Mari Annadhasan, Rajadurai Chandrasekar
Summary: Photon-based data communication technologies provide safe and efficient data transfer. However, conventional silicon-based photonic circuits have drawbacks such as mechanical rigidity. In this study, a flexible organic photonic integrated circuit (FOPIC) is fabricated using mechanically compliant and optically dissimilar organic crystals, enabling precise control of output light at different angles. The circuit allows selective routing of six bandwidth-engineered signals in 2D, utilizing active/passive light-guiding principles and energy-transfer mechanisms. This reconfigurable photonic circuit concept is advantageous for programmable circuits, navigable detectors, and intelligent sensors.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Avulu Vinod Kumar, Evgeniy Mamonov, Tatiana Murzina, Rajadurai Chandrasekar
Summary: The success of silicon photonics lies in the ability to simultaneously design, simulate, and construct optical components and their performance. However, the poor mechanical compliance of Si-based materials requires alternative photonic materials. The recent development of mechanically flexible organic waveguides as reliable platforms for photonic materials shows great promise. In this study, a race-track type resonator based add-drop filter (ADF) was designed and fabricated using elastically bendable 9,10-dibromoanthracene (DBA) crystals. The elastic DBA microcrystals, exhibiting pseudo-plasticity on a substrate, facilitated the fabrication of the race-track type resonator and ADF through mechanophotonics technique. Photonic investigations of the circuit demonstrated its spectral filtering ability. Experimental observations, supported by FDTD modelling, confirmed the unique capabilities of organic optical elements for photonic device applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jada Ravi, Mari Annadhasan, Avulu Vinod Kumar, Rajadurai Chandrasekar
Summary: This study demonstrates the fabrication of microscale organic photonic integrated circuits from two electronically different flexible crystals using a mechanophotonics approach. Mechanical micromanipulation of the crystals with atomic force cantilever tip results in reconfigurable geometries, including three mu-OPICs. These circuits operate through passive- and active-waveguiding mechanisms, depending on the crystal's electronic nature, providing direction-specific optical outputs.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Rajadurai Chandrasekar
Summary: The emergence of molecular crystals as smart nanophotonic components has attracted the attention of scientists, with the development of mechanically flexible crystals requiring challenging micromanipulation methods. The rise of atomic force microscopy has expanded the scope of mechanophotonics and led to the advancement of crystal-based microscale organic photonic integrated circuits. The ability of OPICs to guide, split, couple, and modulate visible electromagnetic radiation using various mechanisms is discussed, with examples from recent literature.
Article
Chemistry, Physical
Mari Annadhasan, Vuppu Vinay Pradeep, Avulu Vinod Kumar, Jada Ravi, Rajadurai Chandrasekar
Summary: Fabrication of organic photonic integrated circuits relies on highly flexible and fluorescent crystalline materials, as well as complex circuit architectures. The IPIN crystal exhibits high mechanical flexibility, bright green fluorescence, and selective self-absorbance of blue light, enabling effective fluorescence conversion. A multi-functional OPIC created using mechano(crystal)photonic approach delivers position-dependent and direction-specific optical signals.
Review
Optics
Guo-Jing Tang, Xin-Tao He, Fu-Long Shi, Jian-Wei Liu, Xiao-Dong Chen, Jian-Wen Dong
Summary: Recent research in topological photonics has made significant progress in proposing and realizing novel topological phenomena, designing and fabricating high-performance photonic devices. Photonic crystals, as a powerful platform for controlling the flow of light, have been widely used to reveal different topological phases of light and demonstrate topological photonic functionalities. Furthermore, topological photonic crystals have found applications in both passive and active photonics.
LASER & PHOTONICS REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
Jada Ravi, Torvid Feiler, Amit Mondal, Adam A. L. Michalchuk, C. Malla Reddy, Biswajit Bhattacharya, Franziska Emmerling, Rajadurai Chandrasekar
Summary: Fluorescent plastically bendable crystals are promising for fabricating photonic integrated circuits due to their optical attributes and mechanical compliance. These crystals can act as active and passive waveguides in various geometries, allowing for input-selective and direction-specific signal transduction.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Avulu Vinod Kumar, Mallesham Godumala, Jada Ravi, Rajadurai Chandrasekar
Summary: We present the construction of an organic crystal multiplexer using three chemically and optically different acicular, flexible organic crystals for broadband visible light signal transportation. By mechanically integrating the crystals, a hybrid single-crystal multiplexer is formed, which effectively transduces three optical signals to a composite output signal within a specific wavelength range, demonstrating the potential of organic flexible crystal waveguides for visible light communication technologies.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Analytical
Zhaolong Wang, Yangfan Gao, Yaru Wang, Jun Yan, Bin Liu, Yunlin Chen
Summary: By using 3-dimensional photonics crystals (3-D PCs) based on bimetallic materials of institute lavoisier frameworks-127 (MIL-127, Fe2M, M = Fe, Ni, Co, Zn), efficient detection of chloroalkanes is achieved.
ANALYTICA CHIMICA ACTA
(2023)
Article
Multidisciplinary Sciences
Alex Dikopoltsev, Yonatan Sharabi, Mark Lyubarov, Yaakov Lumer, Shai Tsesses, Eran Lustig, Ido Kaminer, Mordechai Segev
Summary: Photonic time-crystals are spatially homogeneous media that exhibit periodic variations in their electromagnetic susceptibility, leading to temporal reflections and refractions of propagating waves. Free electrons in these crystals spontaneously emit radiation, with a significantly amplified emission process when associated with momentum-gap modes. Quantum interference between spontaneous emission and electron emission into the band modes suppresses the interdependent emission. Therefore, the study of free-electron physics in photonic time-crystals offers a platform to explore various exciting phenomena.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Nikolaos Farmakidis, Hao Yu, June Sang Lee, Johannes Feldmann, Mengyun Wang, Yuhan He, Samarth Aggarwal, Bowei Dong, Wolfram H. P. Pernice, Harish Bhaskaran
Summary: Integrated photonic circuits (PICs) have gained significant attention and commercial success in the past decade. However, the spectral characteristics of high-quality resonances in PICs are sensitive to small variations in fabrication and material constants, limiting their applicability. In this study, we propose a scalable solution using existing lithography tools to permanently modulate the waveguide's effective index by exploiting the volume shrinkage exhibited by certain polymers during the semiconductor fabrication process. This technique enables broadband and lossless tuning, making it suitable for various applications in optical computing, telecommunications, and free-space optics.
Review
Physics, Multidisciplinary
Jian-Wei Liu, Fu-Long Shi, Xin-Tao He, Guo-Jing Tang, Wen-Jie Chen, Xiao-Dong Chen, Jian-Wen Dong
Summary: Topological photonics is a burgeoning field with unique methods to engineer light flow and protect surface modes. Valley photonic crystals, as a type of topological photonic system, not only support protected surface modes but also are friendly to micro-nano fabrication, showing promise in constructing high-performance photonic devices and integrated circuits.
ADVANCES IN PHYSICS-X
(2021)
Article
Optics
Zi-Xuan Gao, Jing-Zun Liao, Fu-Long Shi, Ke Shen, Fei Ma, Min Chen, Xiao-Dong Chen, Jian-Wen Dong
Summary: This article demonstrates unidirectional bulk modes and robust edge modes in triangular photonic crystals. By changing the phase vortex of an input chiral source, dynamic unidirectional propagation of bulk modes at different valleys is observed. Unidirectional edge modes are also shown on the domain wall between two distinct triangular photonic crystals. In addition, robust edge modes around sharp corners are experimentally confirmed. This work paves the way for the realization of dynamic unidirectional photonic transport and robust valley transport in photonic crystals.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Keisuke Watanabe, Hsin-Yu Wu, Jolly Xavier, Lovleen Tina Joshi, Frank Vollmer
Summary: On-chip silicon microcavity sensors have advantages in virus and biomolecule detection due to their compactness and enhanced light-matter interaction. This study proposes and demonstrates label-free single virus detection using silicon photonic crystal random cavities. The method does not require pre-fabricated defect cavities or optical couplers.