The influence of molecular vibrations on circularly polarized luminescence (CPL) in double helicenes DPC and DNH is reported by Tadashi Mori in a Research Article (e202319702). Specifically, in DPC ...(structure depicted in the picture), the study clarifies how structural changes during electronic transitions shape CPL spectra and dissymmetry (g) factor values, and it underscores the noteworthy contribution of Herzberg–Teller effects in enhancing CPL responses.
A witch with a racemic pair of our nanohoops, TB6CPPs, chants words shown in the font of a magical world. This magic is that the chirality of Troger′s base forces paraphenylenes to become part of a ...circularly polarized luminescence chromophore. The spiral light bands coming out to the space indicate CPL and give the impression that our research contributes to the development of CPL chromophores, for example, of a 3D display in the near future. More information can be found in the Research Article by Y. Yoshigoe and co‐workers (DOI: 10.1002/chem.202304059).
Metasurface is a momentous periodic or aperiodic microstructure which has capabilities in controlling polarization of electromagnetic waves. To realize polarization controlling, many microstructures ...have been designed to achieve the function. However, multi‐band linear to dual‐circular polarization converter is rarely proposed and designed in the last few years. Here, a quad‐band dual‐circular transmissive metasurface (QCT‐MS) is proposed to manipulate polarization of transmissive wave. QCT‐MS is designed as a three‐layer microstructure, with substrate in the middle and two metal patches in the shape of bi‐symmetrical arrow on both sides. The proposed microstructure manipulates linear polarization waves to dual‐circular polarization waves in different frequency bands with x‐polarized or y‐polarized incident waves. The experimental and simulated results reveal that left‐hand circularly polarized waves can be realized in 3.14–3.32, 4.41–4.46, and 14.82–16.05 GHz while the right‐hand circularly polarized waves can be achieved from 9.45 to 10.12 GHz for QCT‐MS with x‐polarized incidences. Moreover, the simulated results also demonstrate its characteristics of wide‐angle transmission and periodic changes. The proposed transmissive metasurface can be utilized in multiband communication and multifunctional dual‐circularly polarized antenna systems.
A quad‐band dual‐circular transmissive metasurface is proposed to manipulate polarization of transmissive wave. The metasurface converts linear polarization wave to dual‐circular polarization wave in different frequency bands with different polarized incidences and has application in multiband communication and multifunctional dual‐circularly polarized antenna systems.
A versatile modular synthetic platform was developed to generate chiral D2‐symmetric figure‐eight shaped macrocycles exhibiting excellent circularly polarized luminescence, as reported by Yasuchika ...Hasegawa, Junpei Yuasa, and Hiroki Oguri et al. in their Research Article (e202318548). A preorganized C2‐symmetric scaffold was designed based on natural products such as chimonanthine, isolated from Chimonanthus praecox, to rapidly generate a diverse range of chiral macrocycles, spanning from 14‐ to 66‐membered rings, eliminating the need for optical resolution.
Zwei umschlungene rechte Hände werden für den Bau von “La Cathédrale” von Auguste Rodin benötigt. Zwei rechtshändige helikale Liganden sind notwendig, um CPL‐emittierende Komplexe vom Rubin‐Typ zu ...entwerfen, wie Juan‐Ramón Jiménez, Claude Piguet et al. in ihrem Forschungsartikel auf S. 10183 berichten.
Dual Circularly Polarized Millimeter-Wave Transmitarray Merlos-Juarez, Diana K.; Rodriguez-Cuevas, Jorge; Martynyuk, Alexander E.
IEEE transactions on antennas and propagation,
03/2024, Letnik:
72, Številka:
3
Journal Article
Recenzirano
This communication reports the dual circularly polarized high-aperture-efficiency transmitarrays (Tas) capable of forming patterns with two independent beams for the right-hand circularly-polarized ...wave (RHCPW) and left-hand circularly-polarized wave (LHCPW) at the same frequency. The five-layer TA elements contain a ring-slot resonator loaded by interdigital capacitors in each layer. The TA element was optimized as a three-bit phase shifter that adds two independent phase shifts to the transmitted RHCPW and LHCPW. The geometry of the TA element was validated by designing two 500-element TAs. At 36.5 GHz, these two TAs form RHCP beams in the directions <inline-formula> <tex-math notation="LaTeX">(\theta =20^{\circ}, \phi =0^{\circ}) </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">(\theta =40^{\circ}, \phi =0^{\circ}) </tex-math></inline-formula>, respectively, and the LHCP beams point in the direction <inline-formula> <tex-math notation="LaTeX">(\theta =0^{\circ}, \phi =0^{\circ}) </tex-math></inline-formula> in both TAs. These two TAs were fabricated and tested. For the first TA, the measured gains were 27.7 and 27.6 dBi for the RHCP and LHCP radiation patterns, respectively, with overall aperture efficiencies <inline-formula> <tex-math notation="LaTeX">\eta _{s} </tex-math></inline-formula> of 0.46 and 0.45. The second TA demonstrated the measured gains of 27.0 and 28.5 dBi for the RHCPW and LHCPW, respectively, with <inline-formula> <tex-math notation="LaTeX">\eta _{s} </tex-math></inline-formula> equal to 0.39 and 0.55. The measured cross-polarization levels in the direction of pattern maximums were −21.1, −24.4 dB for the first TA, and −15.0, −31.2 dB for the second TA, considering RHCPW and LHCPW beams, respectively.
Vortex beam carrying orbital angular momentum (OAM) has been widely explored in optical and microwave regions attributed to its potential characteristics in communication systems. For circular ...polarization incidence, Pancharatnam–Berry (PB) phase is a direct resource to generate phase gradient along the azimuthal direction required by specific OAM mode. The main drawback of PB phase is that it only affects cross‐polarized fields and keeps the copolarized part unmodulated. Here, a paradigm‐shift perspective of noninterleaved metasurfaces is proposed, which can simultaneously generate separate multiple integer and fractional OAM modes occupying both copolarized and cross‐polarized output channels. The scheme is validated by a series of experimental demonstrations in the microwave regime. By adjusting the polarization states of both input and receiving ends, different integer and fractional OAM modes are demonstrated in the full transmission channels. The results offer a unique recipe to enhance information capacity of metasurfaces and trigger versatile electromagnetic (EM) wave function integrations for advanced compact systems. A variety of applications can be readily expected in spin‐selective optics, spin‐Hall metadevices, and multitask metasurfaces operating in both reflection and transmission modes.
A general scheme is proposed to construct noninterleaved metasurface for generating multiple integer and fractional orbital angular momentum modes through altering the polarization state of the input and output ends. The co‐ and cross‐polarized output channels are completely utilized based on geometric and propagation phase modulations, and the transmitted energy is fully applied to implement five distinct vortex wavefronts.
In this paper, a novel dual‐band dual‐polarized leaky‐wave antenna (LWA) with polarization diversity is proposed using half mode substrate‐integrated waveguide (HMSIW)‐based technology. HMSIW LWAs ...are generally single band. In this work, by etching simple spiral type slots on the HMSIW cavity, a novel dual‐band dual‐polarized LWA is designed. The proposed antenna resonates at 5.6 and 8.5 GHz. Moreover, the antenna radiates the linearly polarized wave in the lower band and circularly polarized (CP) wave in the higher operating band. Also, in the higher operating band between 8.7 and 9.3 GHz, the proposed overall antenna exhibits both right‐hand circular polarization as well as the left‐hand circular polarization in the near main beam direction. The −10 dB impedance bandwidth of the proposed antenna at the lower and the higher operating bands are 27% (4.86‐6.4 GHz) and 25% (7.4‐9.6 GHz), respectively. In the higher band, the 3‐dB axial ratio bandwidth of 6.6% (8.7‐9.3 GHz) is achieved. The main beam of the antenna can be steered from 19° to 69° in the forward direction in the lower operating band. In the higher operating band, the antenna can steer the CP beam between −17° and −32°. In both the lower bands, the realized peak gain is observed around 13.3 dBi, whereas in the higher band, the realized peak gain is observed around 14 dBi.