Article
Physics, Applied
Ashutosh Patri, Kevin G. Cognee, Louis Haeberle, Vinod Menon, Christophe Caloz, Stephane Kena-Cohen
Summary: Optical antennas made of low-loss dielectrics, known as photonic gap antennas (PGAs), exhibit high quantum efficiency and intensity enhancement due to their unique configuration with high-index pillar structures and low-index gap materials. By optimizing the position of the gap, PGAs can provide unidirectional out-of-plane radiation and enhance spontaneous emission rates by a factor of approximately 1000 for air gaps and approximately 400 for CYTOP gaps across a spectral bandwidth of about 300 nm at a wavelength of 1.25 μm. As receivers, PGAs can also lead to a near-field intensity enhancement by a factor of about 3000 for air gaps and approximately 1200 for CYTOP gaps.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Applied
Alexander Shurinov, Ivan Dyakonov, Sergei Kulik, Stanislav Straupe
Summary: This paper presents a heuristic mathematical model to explain the relationship between the geometry of a photonic crystal waveguide and the Purcell-enhancement factor at a specific wavelength of interest. It also proposes approaches to design a photonic crystal waveguide that maximizes the Purcell enhancement at a target wavelength.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Hisaya Oda, Youhei Hosokawa, Kazuki Hayashi, Nobuhiko Ozaki, Naoki Ikeda, Yoshimasa Sugimoto
Summary: We achieved wide-band wavelength conversion through four-wave mixing in W3-type AlGaAs photonic crystal waveguides. The large third-order nonlinearity of AlGaAs and its large bandgap in the 1550 nm range enabled us to avoid two-photon absorption. We obtained a four-wave mixing efficiency of -7 dB for a pump peak power of 7 W, and a conversion bandwidth greater than 38 nm with a conversion efficiency of -22 dB by utilizing the two even guided bands of the W3-type photonic crystal waveguide.
APPLIED PHYSICS EXPRESS
(2023)
Article
Optics
Gian-Luca Roth, Stefan Kefer, Steffen Hessler, Cemal Esen, Ralf Hellmann
Summary: The study presents the fabrication of integrated photonic crystal waveguides inside transparent polymers using femtosecond lasers. By generating hexagonal photonic lattice-like waveguides, the limitations caused by minor refractive index changes are overcome, allowing for light confinement and transmission.
LASER & PHOTONICS REVIEWS
(2021)
Article
Physics, Multidisciplinary
Guo-An Yan, Hua Lu
Summary: This study proposes a quantum routing scheme for a chiral quantum system by coupling an emitter to two chiral waveguides. The scheme allows arbitrary transfer of quantum information between input and output ports with high efficiency.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Liang Fang, Jian Wang
Summary: This paper proposes a method to broaden the bandwidth of chiral coupling using fork-type inversely tapered nanowire waveguides, and designs and simulates two device models based on different cladding materials to demonstrate the feasibility of this approach, achieving a bandwidth of 70 nm under high directionality.
Article
Nanoscience & Nanotechnology
Sanghyeok Park, Dongha Kim, Min-Kyo Seo
Summary: Interlayer excitons in van der Waals heterostructures of two-dimensional transition-metal dichalcogenides have shown potential applications in quantum many-body effects, long-range interactions, and optovalleytronic devices. However, further development is needed to improve the long-lived character of interlayer excitons. The proposed plasmonic photonic crystal mirror can significantly increase the radiative lifetime of interlayer excitons and offer new possibilities for realizing long-lived interlayer exciton-based nanodevices.
Article
Optics
Jie Li, Shi Zhao, Jingye Chen, Yaocheng Shi
Summary: A low-loss ridge waveguide is proposed and demonstrated with a novel bound state in the continuum (BIC)-based structure on the silicon-on-insulator (SOI) platform. The waveguide suppresses TM-mode leakage and has a low propagation loss of approximately 0.0027 dB/cm at 1550 nm. Experimental results show an average loss suppression of about 30 dB in the wavelength range from 1530 nm to 1600 nm. The novel ridge waveguide structure can also be applied to narrowband optical filters, such as the fabricated Bragg grating filter with a narrow bandwidth of approximately 1 nm and an extinction ratio of about 14.8 dB.
Article
Materials Science, Multidisciplinary
S. Sudha Maria Lis, K. Rajasimha, Kapil Debnath, V. Krishna Chaitanya, B. N. Shivakiran Bhaktha
Summary: In this study, the sol-gel fabrication and characterization of SiO2-TiO2 one-dimensional photonic crystal (1DPhC) waveguides embedded with a low-index defect layer are presented. Femtosecond laser micromachining was used for microfabrication on multilayer structures, and the waveguiding characteristics of the fabricated structures were studied. The results show that the fabricated 1DPhC channel waveguides have efficient light guiding properties and are suitable for applications in optical integrated circuits.
Article
Materials Science, Multidisciplinary
Julian M. Bopp, Matthias Plock, Tim Turan, Gregor Pieplow, Sven Burger, Tim Schroeder
Summary: Photon loss is a major challenge in photonic quantum applications. This work introduces a waveguide-integrated 'Sawfish' photonic crystal cavity that efficiently couples light from a quantum emitter to a single-mode fiber, reducing resource requirements in quantum communication. Machine learning is used to estimate sensitivities to fabrication tolerances.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Pei-Lin Wang, Li-Ming Zhao, Yun-Song Zhou
Summary: In this study, a new method is proposed to dynamically generate localized defect states (LDS) in multichannel photonic crystal waveguides by modulating the position, polarization, and phase of multiple dipole sources. A general theory is proposed to obtain the localization conditions for generating LDS. Unlike traditional LDS, the size and position of the LDS can be adjusted by controlling the dipole sources, and the conversion between LDS and waveguide mode can be easily realized by modulating the dipole sources.
Article
Optics
Zi-Wen Zhang, Chao-Hai Du, Yu-Lu Lei, Juan-Feng Zhu, Pu-Kun Liu
Summary: This article presents an approach to construct plasmonic bound states in the continuum (BICs) for emitting intense radiation over a broad spectral range. The proposed method achieves broadband tunability and potential improvement in radiation intensity. The experimental validation of constructing BIC using plasmonic antennas is also demonstrated.
PHOTONICS RESEARCH
(2023)
Article
Quantum Science & Technology
Massimo Gurioli
Summary: This study investigates the spectral and spatial dependence of the resonant Lamb shift of an exciton inside a photonic vacuum field landscape, which can predict an optical dipole potential generated via virtual photons quantum fluctuations. The trapping potential can be utilized for exciton self-positioning at the nanoscale in electric field hotspots, aiming to observe quantum electrodynamics effects. By decomposing the electromagnetic Green tensor in terms of quasi-normal modes, the resonant part of the Lamb shift is expressed as Fano profile interconnected with the Purcell enhancement of exciton radiative lifetime, providing insights on tailoring the depth of the vacuum photonic potential in various scenarios.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Physics, Multidisciplinary
Xin-Tong Zhang
Summary: By engineering the group velocity of LiNbO3 ridge waveguides on LiTaO3 substrates, efficient and broadband second harmonic generation is achieved with acceptance bandwidth over 20 nm at telecom-band, and a high conversion efficiency of > 25 %W-1 . cm(-2).
Article
Engineering, Multidisciplinary
Sanna Monkola, Joona Raty
Summary: Discrete exterior calculus is a promising discretization method for photonic crystal waveguides, offering efficient handling of nonhomogeneous computational domains and curved surfaces. In this study, we present a two-dimensional discretization method for photonic crystal waveguides using discrete exterior calculus and demonstrate its advantages through numerical experiments.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
