Article
Optics
Jose Angel Picazo-Bueno, Alvaro Barroso, Steffi Ketelhut, Juergen Schnekenburger, Vicente Mico, Bjoern Kemper
Summary: We present a novel single capture approach for simultaneous incoherent bright field (BF) and laser-based quantitative phase imaging (QPI). By implementing common-path digital holographic microscopy (DHM) in parallel with BF imaging within the optical path of a commercial optical microscope, we achieve spatially multiplexed recording of white light images and digital off-axis holograms, which are subsequently numerically demultiplexed. The performance of this multimodal concept is evaluated using microspheres and demonstrated for label-free dual-mode QPI and BF imaging of living pancreatic tumor cells.
Article
Optics
Guillaume Blanquer, Vivien Loo, Nancy Rahbany, Christophe Couteau, Sylvain Blaize, Rafael Salas-Montiel, Yannick de Wilde, Valentina Krachmalnicoff
Summary: The study focuses on the characterization of a hybrid dielectric/plasmonic waveguide and experimentally demonstrates the strong directionality of the device. It also highlights the ability of the plasmonic antenna to generate powerful coupling between a single emitter and the waveguide through numerical simulations.
Article
Optics
Peihang Li, Peng Yu, Jiachen Sun, Zhimin Jing, Jiang Wu, Lucas V. Besteiro, Roberto Caputo, Arup Neogi, Hongxing Xu, Zhiming Wang
Summary: This paper presents a method of coupling nanowire-based quantum dot emitters with plasmonic nanoantennas to improve the efficiency of single-photon sources. By designing a linear array of nanowire-based quantum dot emitters coupled with plasmonic antennas at specific distances, the directionality and emission rate of single-photon emitters can be enhanced. Finite element modeling is used to design compact structures with high quantum efficiencies and directionality, while retaining the advantages of nanowire-based quantum dots.
PHOTONICS RESEARCH
(2022)
Article
Physics, Applied
Ning Ding, Qingyu Ma, Yuzhi Li, Gepu Guo, Juan Tu, Dong Zhang
Summary: OA-AV beams can be constructed by introducing phase delays to traditional transducer arrays for contactless manipulations, showing a linear trajectory. The axial and cross-sectional profiles of the acoustic-vortex beams can be adjusted based on the order and radial offset.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Jialong Peng, Hyeon-Ho Jeong, Michael Smith, Rohit Chikkaraddy, Qianqi Lin, Hsin-Ling Liang, Michael F. L. De Volder, Silvia Vignolini, Sohini Kar-Narayan, Jeremy J. Baumberg
Summary: This study introduces flexible active plasmonic metafilms constructed by printing electrochromic nanoparticles onto ultrathin metal films (<15 nm), providing low-power electrically driven color switching, and opening up potential for fully printed electrochromic devices. Differences in plasmonic mode excitation between nanoparticles and ultrathin metal films result in directional optical effects and dynamics where perceived upward and downward colorations can differ.
Article
Optics
Xiaofei Wang, Hui Yu, Qiang Zhang, Zhilei Fu, Penghui Xia, Qikai Huang, Nannan Ning, Zhujun Wei, Yuehai Wang, Xiaoqing Jiang, Jianyi Yang
Summary: This study investigates the use of asymmetrical directional couplers with subwave-length sidewall corrugations to achieve ultra-compact silicon mode (de)multiplexers at C-band. It demonstrates the design of three (de)multiplexers with ultra-short coupling lengths and their cascading to build a four-channel mode-division-multiplexing (MDM) link. The results show low insertion losses and good cross-talk suppression performance of the multiplexers.
Editorial Material
Optics
Albert Liu
Summary: The article discusses the applications and unintuitive imaging characteristics of using off-axis parabolic mirrors to focus beams of light. These considerations have direct applications in implementing non-collinear optical geometries.
Article
Optics
Jianing Liu, Hao Wang, Leonard C. Kogos, Yuyu Li, Yunzhe Li, Lei Tian, Roberto Paiella
Summary: Photonics offers a promising approach for image processing through spatial filtering, providing faster speeds and lower power consumption compared to electronic digital solutions. A new method based on pixel arrays of plasmonic directional image sensors is presented, allowing selective detection of light along a small set of geometrically adjustable directions. The resulting imaging systems serve as optical spatial filters without external filtering elements, enabling extreme size miniaturization and the ability to perform multiple filtering operations simultaneously. Rigorous theoretical models and experimental demonstrations showcase the image processing capabilities of these devices, with potential applications in biomedicine and computer vision.
Article
Chemistry, Physical
Dongda Wu, Yi Wang, Jiamin Xiao, Jiang Hu, Xuchao Zhao, Yuhao Gao, Jiazhi Yuan, Wenxin Wang
Summary: In this study, an Al nanocone array in a honeycomb arrangement was used to achieve directional and polarized enhanced spontaneous emission of R6G. The research results showed that a 140-fold enhancement effect could be observed under specific pump power density. Additionally, the study found that the modification of the iso-frequency properties was influenced by the surface lattice resonance mode.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Dongda Wu, Yi Wang, Jiamin Xiao, Jiang Hu, Xuchao Zhao, Yuhao Gao, Jiazhi Yuan, Wenxin Wang
Summary: In this study, an Al nanocone array in a honeycomb arrangement was used to achieve the directional and polarized amplified spontaneous emission (ASE) of R6G. The interaction between the degenerated surface lattice resonance (SLR) mode and the emission of gain media resulted in 140-fold enhanced ASE. This research provides insights into the generation of nanolasing with directional emission and lays a foundation for the development of plasmonic devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Leeju Singh, Nicolo Maccaferri, Denis Garoli, Yuri Gorodetski
Summary: The coupling between light and surface plasmon polaritons can lead to Fano-like resonance lineshapes when a single scattering object is present on a metallic surface. By using a chiral nanotip, the excitation of surface plasmons with a strong spin-dependent azimuthal variation was investigated in this study, demonstrating the modification of a complex coupling factor through symmetry breaking of the nanostructure.
Article
Nanoscience & Nanotechnology
Yanyan Cheng, Shunfei Qiang, Jiaqi Li, Wenbo Wei, Yanmin Kuang, Wenkai Zhang, Xiaomin Fang, Tao Ding, Lijun Guo, Yujie Chen, Xudong Chen
Summary: Through coupling with a plasmonic nanopatch antenna, a bright and ultrafast emission of red-emissive carbon dots has been achieved, showing great potential for various applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Astronomy & Astrophysics
A. C. Caligula do E. S. Pedreira, N. Fraija, A. Galvan-Gamez, B. Betancourt Kamenetskaia, P. Veres, M. G. Dainotti, S. Dichiara, R. L. Becerra
Summary: As we study gamma-ray bursts (GRBs) in more depth, through theoretical models and observational tools, new options are opening up to explore their physical properties. GRBs are dominated by synchrotron radiation, which should exhibit some degree of polarization. However, observing this polarization is challenging, especially for short GRBs. Nonetheless, it is crucial to lay the groundwork for the future abundance of data. In this study, we present a polarization model linked to an off-axis spreading top-hat jet synchrotron scenario in a stratified environment with varying density profiles and apply it to predict polarization in GRBs emitting off-axis afterglow.
ASTROPHYSICAL JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Dongda Wu, Yi Wang, Yujun Liu, Junqiao La, Shijia He, Fanzhou Lv, Wenxin Wang
Summary: The interplay between light and matter at the nanoscale can be enhanced by Bloch surface plasmon polariton (Bloch-SPP) on the plasmonic lattice. An Ag nanohole array arranged in a hexagonal formation acted as an optical cavity to achieve directional and polarized amplified spontaneous emission (ASE) of R6G molecules. A 100-fold enhancement of ASE was observed at a 15-degree emission angle under TM polarization when the pump power density exceeded a threshold of 198 W/cm2 based on degenerated high state density modes. Additionally, the Bloch-SPP modes modulated a specific polarization dependence of ASE, with the degree of polarization increasing from 1.3 to 2.1 when the pump power density exceeded the ASE threshold. This work elucidates the interaction between gain media and plasmonic systems, providing a foundation for the design of plasmonic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Astronomy & Astrophysics
N. Fraija, M. G. Dainotti, D. Levine, B. Betancourt Kamenetskaia, A. Galvan-Gamez
Summary: Gamma-ray bursts (GRBs) are important events for studying multiwavelength observations. This study extends the closure relations of synchrotron self-Compton (SSC) emission from an on-axis scenario to an off-axis scenario, and investigates the spectral and temporal index evolution of GRBs reported in the Second Gamma-ray Burst Catalog (2FLGC).
ASTROPHYSICAL JOURNAL
(2023)
Article
Optics
Ibrahim Issah, Tuomas Pihlava, Alireza Rahimi Rashed, Humeyra Caglayan
Summary: This article introduces a polymer-based hyperbolic metamaterial structure and demonstrates its unique potential in loss compensation, quantum applications, and sub-wavelength imaging techniques through experimental investigation and comparison of the dynamics of different emitters within the structure, as well as compensation of metallic losses by introducing gain materials with emission wavelengths close to the epsilon-near-zero region of the metamaterial.
Article
Multidisciplinary Sciences
Rakesh Dhama, Ali Panahpour, Tuomas Pihlava, Dipa Ghindani, Humeyra Caglayan
Summary: The authors demonstrate a method of modulating the amplitude of incident signals by controlling the plasmon-induced enhancement of the index of refraction. This approach does not require gain materials or nonlinear processes and can potentially improve the modulation strength of optical modulators and switches.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Mohsin Habib, Ibrahim Issah, Esteban Bermudez-Urena, Humeyra Caglayan
Summary: Study on the fabrication of ENZ multilayer metamaterials using a self-rolling technique, investigating their dispersion and optical characteristics, and demonstrating their potential for supporting ENZ waveguides. This platform can be used for dispersion engineering and unique applications.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Dipa Ghindani, Ibrahim Issah, Semyon Chervinskii, Markus Lahikainen, Kim Kuntze, Arri Priimagi, Humeyra Caglayan
Summary: This research demonstrates the active tuning of photoluminescence by changing the ambient humidity, providing opportunities for developing tunable photonic devices.
Article
Physics, Applied
Jinlin Song, Lei Chen, Lin Jin, Lei Yao, Humeyra Caglayan, Run Hu
Summary: Near-field radiative heat transfer in many-body systems has great potential for various applications. This study investigates the enhancement and regulation of heat transfer between two monolayer graphene sheets by introducing an hBN plate. It is found that the addition of the hBN plate greatly enhances the heat transfer, and the shift frequency of hBN can be adjusted to achieve remarkable thermal regulation.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Dipa Ghindani, Tuomas Pihlava, Humeyra Caglayan
Summary: A polarization-independent plasmonic structure with nanoantennas on an ENZ substrate is designed to reduce the sensitivity of resonance wavelength to geometrical perturbations.
Correction
Multidisciplinary Sciences
Rakesh Dhama, Ali Panahpour, Tuomas Pihlava, Dipa Ghindani, Humeyra Caglayan
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Faisal Ahmed, Carlos Rodriguez-Fernandez, Henry A. Fernandez, Yi Zhang, Abde Mayeen Shafi, Md Gius Uddin, Xiaoqi Cui, Hoon Hahn Yoon, Naveed Mehmood, Andreas C. Liapis, Lide Yao, Humeyra Caglayan, Zhipei Sun, Harri Lipsanen
Summary: Developing selective and coherent polymorphic crystals at the nanoscale can be used to design integrated architectures for photonic and optoelectronic applications. In this study, a direct optical writing approach is demonstrated to create polymorphic 2D materials. The polymorphic-engineered MoTe2 shows strong optical contrast and enhanced third harmonic generation intensity, making it suitable for various applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
G. Krishnamurthy Grandhi, Rakesh Dhama, Noolu Srinivasa Manikanta Viswanath, Ekaterina S. Lisitsyna, Basheer Al-Anesi, Jayanta Dana, Vipinraj Sugathan, Humeyra Caglayan, Paola Vivo
Summary: The perovskite-inspired Cu2AgBiI6 (CABI) absorber holds potential for low toxicity indoor photovoltaics. However, the self-trapping of carriers in CABI reduces its photovoltaic performance. Through the analysis of the excited-state dynamics of CABI, it is found that photoexcitation in CABI leads to the formation and luminescence of self-trapped states. The understanding of this self-trapping phenomenon is crucial for optimizing the optoelectronic properties of CABI and can be achieved through compositional engineering.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Rakesh Dhama, Mohsin Habib, Alireza R. Rashed, Humeyra Caglayan
Summary: Conventional plasmonic nanoantennas cannot fully exploit their scattering and absorption features simultaneously due to their overlap in the same wavelength region. However, hyperbolic meta-antennas (HMA) with spectrally separated scattering and absorption bands enable enhanced hot-electron generation and prolonged relaxation dynamics of hot carriers. By extending the plasmon-modulated photoluminescence spectrum towards longer wavelengths and controlling the tunable absorption band, HMA offers improved excitation efficiency and broader utilization of visible/NIR spectrum compared to nanodisk antennas (NDA). Therefore, rational heterostructures designed with plasmonic and adsorbate/dielectric layers in such dynamics can optimize and engineer the utilization of plasmon-induced hot carriers.
Article
Nanoscience & Nanotechnology
Michael Lobet, Nathaniel Kinsey, Inigo Liberal, Humeyra Caglayan, Paloma A. Huidobro, Emanuele Galiffi, Jorge Ricardo Mejia-Salazar, Giovanna Palermo, Zubin Jacob, Nicolo Maccaferri
Summary: This Perspective provides an overview of the state of the art and challenges in emerging research areas where near-zero refractive index and hyperbolic metamaterials are pivotal, including light and thermal emission, nonlinear optics, sensing applications, and time-varying photonics.
Article
Nanoscience & Nanotechnology
Ipek Anil Atalay Appak, Erdem Sahin, Christine Guillemot, Humeyra Caglayan
Summary: Conventional microscopy systems have limited depth of field. To address this challenge, a computational extended depth of field (EDOF) microscope combining learned optics and a deblurring neural network is proposed. A systematic design methodology based on the specific sample visualization requirements is presented, showing that metasurface optics provides superior EDOF performance.
Article
Optics
Ibrahim Issah, Jesse Pietila, Tommi Kujala, Matias Koivurova, Humeyra Caglayan, Marco Ornigotti
Summary: This work proposes epsilon-near-zero (ENZ) nanoparticles composed of metal and dielectric bilayers, and uses the effective-medium approach to study their optical response. By varying the radii of the bilayer nanospheres, a passive tunable ENZ region ranging from visible to near IR is obtained. Additionally, the absorption and scattering cross section of ENZ nanoparticles are presented using open-source transfer-matrix-based software (STRATIFY). The proposed ENZ nanoparticle is expected to be experimentally realized using chemical synthesis techniques.
