Review
Chemistry, Multidisciplinary
Anyi Zheng, Tonghan Zhao, Xue Jin, Wangen Miao, Pengfei Duan
Summary: Circularly polarized luminescence (CPL)-active materials have attracted attention for their wide applications, but there is a trade-off between the luminescence dissymmetry factor and luminescence quantum yield. Chiral porous crystalline nanomaterials (PCNMs) have shown potential for solving this problem and achieving functional CPL-active materials.
Article
Multidisciplinary Sciences
Inho Song, Jaeyong Ahn, Hyungju Ahn, Sang Hyuk Lee, Jianguo Mei, Nicholas A. Kotov, Joon Hak Oh
Summary: In this study, a simple and powerful method was used to fabricate chiroptical flexible layers through supramolecular helical ordering of conjugated polymer chains. The multiscale chirality and optical activity of these layers can be varied across a broad spectral range by chiral templating. After template removal, chromophores remain in one-dimensional helical nanofibrils, producing a homogeneous chiroptical layer with drastically enhanced polarization-dependent absorbance, enabling well-resolved detection and visualization of the spin angular momentum (SAM) of photons. This study provides a scalable path towards on-chip detection of the spin degree of freedom of photons necessary for encoded quantum information processing and high-resolution polarization imaging.
Article
Optics
Jui-Tse Tsai, Chi-Ti Hsieh, Chao-Chieh Cheng, Min-Hsiung Shih, Shu-Wei Chang
Summary: In this work, a compact circularly-polarized (CP) light source for chirality-based applications at the chip level is proposed. The device scheme utilizes an in-plane submicron phase shifter instead of a traditional quarter-wave plate to generate CP light. By combining the vertical radiations from two phase-shifted light sources, compact circularly-polarized lasers are demonstrated without the need for extrinsic materials, large-area auxiliary structures, or specialized operation conditions critical for CP radiation. The fabricated devices exhibit a high degree of circular polarization, reaching up to 74%.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Eigo Shimaoka, Masaki Kunihiro, Masahiro Funahashi
Summary: Oligo(p-phenylenevinylene)-based chiral nematic liquid crystals were synthesized and showed tunable reflection band for circularly polarized fluorescence. The glassy chiral nematic films exhibited left-handed circularly polarized light at room temperature.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Junjie Hao, Fenghuan Zhao, Qiushi Wang, Jiaying Lin, Peixian Chen, Junzi Li, Dongxiang Zhang, Meijuan Chen, Peizhao Liu, Marie-Helene Delville, Tingchao He, Jiaji Cheng, Yiwen Li
Summary: This study investigates the induced chirality and circularly polarized luminescence (CPL) as a function of the CdS shell growth in CdSe/CdS nanoplatelets (NPLs) capped with chiral ligands. The formation of island-like and full coating CdS shell has a direct relationship with the chiroptical response, showing a clear signal evolution. It is found that the island-like shell gives birth to the CPL signal, while the full coating shell decreases the induced chirality.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Physical
Daniele Toffoli, Andrea Russi, Giovanna Fronzoni, Emanuele Coccia, Mauro Stener, Luca Sementa, Alessandro Fortunelli
Summary: The study reveals that the suppressed dichroic response in two-dimensional chiral nanowires is due to destructive interference of nearly degenerate components with opposite signs, while a giant dichroic response is predicted for three-dimensional helical coiling nanowires.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Subhangi Subedi, Avinash K. Rella, Le Gia Trung, Vineet Kumar, Shin-Woong Kang
Summary: This study reports the synthesis of anisometric carbon quantum dots (CQDs) and the macroscopic control of their uniaxial orientation, resulting in linearly polarized photoluminescence (LP-PL). The as-synthesized CQDs exhibit a high PL quantum yield. The elongated CQDs can be directionally switched using the electrical responsiveness of the CQDs and the liquid crystal host. The anisometric CQDs have been successfully adopted for the fabrication of polarization-sensitive and electrically switchable PL devices.
Article
Engineering, Electrical & Electronic
Debidas Kundu, Aparna Parameswaran, Hrishikesh Shashikant Sonalikar, Dhrubajyoti Bhattacharya, Shulabh Gupta
Summary: A low-radar cross section circularly polarized reflectarray antenna with a linearly polarized feed is designed, which reduces the out-of-band RCS by using an absorptive frequency selective reflector (AFSR). The design of the AFSR is expedited by a systematic methodology based on the synthesis of the equivalent circuit model. The proposed design achieves improved performance in terms of reduced RCS and maintained gain compared to a conventional reflectarray.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Bin Zheng, Yong Fan, Yu Jian Cheng
Summary: A wideband high-efficiency transmitarray antenna with linear-to-circular polarization transformation is presented using the low-loss element design method. It consists of a linearly polarized U-slot patch antenna and a circularly polarized single-arm Archimedean spiral antenna, offering low insertion loss and good incident angle stability over a wide frequency band. The fabricated transmitarray, with 1613 elements and a thickness of 0.14-?(0), achieves a measured peak gain of 31.8 dBi and an aperture efficiency of 60.2%. The measured 1 dB gain bandwidth is 15.2% from 18.25 to 21.25 GHz. The antenna's simple structure, high performance, and low complexity make it a cost-effective and high-gain circularly polarized antenna.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Stefan S. Warthegau, Andreas E. Hillers-Bendtsen, Stephan K. Pedersen, Cecilie Rindom, Christoffer Braestrup, Jeppe S. Jensen, Ole Hammerich, Maria S. Thomsen, Fadhil S. Kamounah, Patrick Norman, Kurt V. Mikkelsen, Theis Brock-Nannestad, Michael Pittelkow
Summary: This paper describes a concise synthetic strategy for the preparation of heterocyclic [9]helicenes and a simple preparative-scale protocol for the optical resolution of the resulting M- and P-enantiomers. The helicenes were characterized using single-crystal X-ray diffraction and a range of spectroscopic and computational techniques. A fluorescence quantum yield of up to 65% was observed, and the chiroptical properties of both M- and P-helicenes revealed large dissymmetry factors. The circularly polarized luminescence brightness reaches up to 17 M-1 cm-1, as measured experimentally and verified computationally, which makes this the highest circularly polarized luminescence brightness among heterocyclic helicenes.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Zhanxiang Chen, Manli Huang, Cheng Zhong, Shaolong Gong, Veaceslav Coropceanu, Jean-Luc Bredas, Chuluo Yang
Summary: It is a challenge to achieve high luminescence dissymmetry factor (g) in circularly polarized luminescence (CPL) materials. In this study, we investigated the role of molecular structure on CPL and found that delocalized transition density and optimized chromophore twisting are crucial for obtaining large g-factors. These findings provide molecular-level insights into CPL of organic emitters and have potential applications in the design of chiroptical materials and systems with strong CPL effects.
Article
Engineering, Electrical & Electronic
Pan-Pan Zhang, Xi-Cheng Zhu, Yun Hu, Zhang-Cheng Hao, Guo-Qing Luo
Summary: This letter presents the design and implementation of a wideband circularly polarized folded reflectarray antenna (CPFRA) with a linearly polarized (LP) feed antenna. The CPFRA utilizes a polarization-sensitive frequency selective surface (FSS) and sequential rotation technique to achieve wideband operation and enhanced axial ratio (AR) bandwidth.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Masoud Kazem-Rostami, Angel Orte, Ana M. Ortuno, Arthur H. G. David, Indranil Roy, Delia Miguel, Amine Garci, Carlos M. Cruz, Charlotte L. Stern, Juan M. Cuerva, J. Fraser Stoddart
Summary: In this study, the chirality transfer from a chiral host to an encapsulated achiral fluorophore has been achieved, resulting in specific photophysical and chiroptical properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Tianwen Fan, Bangyi Zhou, Hongyu Guo, Fafu Yang
Summary: The study revealed that shorter alkyl chains resulted in stronger CPL emission for non-liquid crystalline systems, in contrast to the results of liquid crystalline molecules, providing a new direction for the design of chiroptical materials based on non-liquid crystalline molecules.
Review
Materials Science, Multidisciplinary
Yadong Zhang, Shu Yu, Bing Han, Yunlong Zhou, Xiuwen Zhang, Xiaoqing Gao, Zhiyong Tang
Summary: Due to their magnetic photophysical properties, circularly polarized luminescence (CPL) materials have attracted significant interest. This review provides a comprehensive overview of this field, including theory, experiments, and categorization of CPL-active materials. It also discusses the factors influencing the dissymmetry factor and luminescence efficiency, as well as the opportunities and challenges for enhancing both factors.
