Article
Engineering, Electrical & Electronic
Hao Sun, Bruno Taglietti, Yue Wang, Lawrence R. Chen
Summary: Bragg gratings (BGs) are widely used in microwave photonic signal processing and systems due to their customizable amplitude and phase responses. Waveguide BGs (WBGs) are compact and easily integrated with other components to build MWP systems. Subwavelength grating (SWG) waveguides and passive devices in silicon-on-insulator (SOI) have enabled the development of breakthrough devices based on anisotropic metamaterials.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Stefan Kefer, Dominik Pape, Gian-Luca Roth, Steffen Hessler, Bernhard Schmauss, Ralf Hellmann
Summary: This study demonstrates a novel approach for the fabrication and rapid prototyping of monolithic photonic platforms with integrated sensing structures. By utilizing injection-molded substrates and UV radiation to modify the refractive index, the platform is equipped with high-sensitivity temperature and refractive index measurement capabilities. The integration of Bragg grating and Fabry-Perot cavity during micromilling process opens up new possibilities for optical sensing applications.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Engineering, Electrical & Electronic
Rui Cheng, Lukas Chrostowski
Summary: This tutorial discusses the development of Integrated Bragg gratings (IBGs) on the silicon-on-insulator (SOI) platform and their potential applications in optical telecommunications and signal processing. The design methodology for SOI-based IBGs is described, along with examples of advanced optical devices.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Haonan Ling, Arnab Manna, Jialiang Shen, Ho-Ting Tung, David Sharp, Johannes Froch, Siyuan Dai, Arka Majumdar, Artur R. Davoyan
Summary: This study investigates the interaction between light and matter in van der Waals MoS2 nanophotonic devices and demonstrates deep subwavelength optical field confinement in nanostructures, which has the potential to significantly reduce the size of integrated photonic devices and opto-electronic circuits.
Article
Engineering, Electrical & Electronic
Mathias J. Weisen, James C. Gates, Corin B. E. Gawith, Peter G. R. Smith, Peter Horak
Summary: The study proposes the use of bi-directional propagation of light in silica integrated coupled waveguide structures for linear optical processing, implementing linear operations using symmetric and unitary matrices. It demonstrates the realization of an arbitrary 4x4 coupler through a linear sequence of more fundamental 2x2 couplers, and discusses the implementation in a silica integrated platform utilizing direct UV-written waveguides and grating couplers for optimized coupling efficiency.
IEEE PHOTONICS JOURNAL
(2021)
Review
Chemistry, Physical
Kaili Chang, Zenghui Li, Yuzong Gu, Kaihui Liu, Ke Chen
Summary: Graphene-integrated waveguides (GIWGs) have shown great potential for next-generation datacom technology due to their compactness and compatibility with traditional optical waveguides. However, the commercial scalability of GIWGs' fabrication techniques is still a challenge. This article discusses recent developments in GIWGs in two-dimensional optoelectronics, focusing on their properties, wave-matter interaction mechanisms, and fabrication techniques. The advantages and potential applications of GIWGs in telecom networks are highlighted, along with major challenges and development trends to bridge the gap between concept demonstrations and practical applications.
Article
Chemistry, Multidisciplinary
Ali Emre Kaplan, Valerio Vitali, Valeria Demontis, Francesco Rossella, Andrea Fontana, Samuele Cornia, Periklis Petropoulos, Vittorio Bellani, Cosimo Lacava, Ilaria Cristiani
Summary: In this work, we present the design of a silicon photonic-based polarization converting device integrating semiconductor InP nanowires on the silicon photonic platform. A comprehensive numerical analysis shows that the device can achieve full polarization conversion with minimal power loss in small footprints. This approach can pave the way for complex and reconfigurable photonic processors based on the manipulation of polarization state of guided light beams.
Article
Chemistry, Analytical
Georgios Syriopoulos, Ioannis Poulopoulos, Charalampos Zervos, Evrydiki Kyriazi, Aggelos Poulimenos, Michal Szaj, Jeroen Missinne, Geert van Steenberge, Hercules Avramopoulos
Summary: The use of composite materials in the aerospace industry has been widely adopted due to their favorable mechanical characteristics. However, in order to fully utilize these materials, the out-of-autoclave production processes need to be optimized. Photonic Integrated Circuits (PICs) can provide sensing solutions that meet the requirements for composite material production using carbon fibers.
Article
Optics
Yunus Denizhan Sirmaci, Angela Barreda Gomez, Thomas Pertsch, Jens H. Schmid, Pavel Cheben, Isabelle Staude
Summary: The paper proposes and demonstrates a novel silicon nanophotonic waveguide consisting of a chain of resonantly forward scattering nanoparticles with spectrally overlapping electric and magnetic dipolar Mie-type resonances. The propagation loss of the meta-waveguides in the telecom spectral range is as low as 0.4 dB mm(-1), surpassing the current record for Mie-resonant waveguides by more than an order of magnitude. The meta-waveguides also support a negative group index over a broad spectral range and exhibit regions of vanishing and anomalous dispersion within the transmission band. Furthermore, compact resonance-protected waveguide bends and efficient splitters can be implemented within just 320 nm propagation length.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Stefan Kefer, Gian-Luca Roth, Julian Zettl, Bernhard Schmauss, Ralf Hellmann
Summary: This study demonstrates the generation of photonic crystal waveguides within bulk planar sapphire substrates. The refractive index in a hexagonal pattern around the waveguide core is modified using a femtosecond laser, resulting in single-mode behavior and adjustable mode-field diameter. Bragg gratings are also generated within the waveguide core, exhibiting two distinct wavelengths of main reflection that can be selectively adjusted by exciting the birefringent waveguide with appropriately polarized light.
Article
Optics
Yuhan Yao, Yuhe Zhao, Yanxian Wei, Feng Zhou, Daigao Chen, Yuguang Zhang, Xi Xiao, Ming Li, Jianji Dong, Shaohua Yu, Xinliang Zhang
Summary: This article presents a highly integrated dual-modality microwave frequency identification system on a single chip, which can identify different types of microwave signals and discriminate instantaneous frequency variation among the frequency-modulated signals. This technology can meet the requirements of reduction in size, weight, and power for future advanced microwave photonic processors.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Yue Dong, Yu Liu, Yin Xu, Bo Zhang
Summary: This paper introduces a multistage Bragg grating design for a reflection-based TM-pass/TE-stop polarizer. The design increases the working bandwidth of the polarizer and allows for an extended wavelength range without compromising its performance.
Article
Optics
Cameron M. Naraine, Jocelyn N. Westwood-Bachman, Cameron Horvath, Mirwais Aktary, Andrew P. Knights, Jens H. Schmid, Pavel Cheben, Jonathan D. B. Bradley
Summary: Subwavelength grating (SWG) metamaterial waveguides and ring resonators on a silicon nitride platform are proposed and demonstrated. The SWG waveguide achieves a large overlap (53%) of the Bloch mode with the top cladding material, showing great potential for evanescent field sensing and light amplification. Fabricated using a commercial rapid turn-around silicon nitride prototyping foundry process, the devices have critical dimensions greater than 100 nm. Experimental characterization reveals excellent internal quality factor (2.11 x 10(5)) and low propagation loss (approximately 1.5 dB cm(-1)) in the C-band, surpassing silicon-based SWG ring resonators. These results demonstrate the promising prospects of SWG metamaterial structures for silicon nitride based photonic integrated circuits.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Alexander Chen, Amir Begovic, Stephen Anderson, Zhaoran Rena Huang
Summary: Si photonic foundry fabricated cascaded and continuous spiral shaped silicon nitride waveguides with Bragg grating structures to achieve on-chip true-time delay line. Time-domain measurement method was used to characterize the delay time, and the highest group index extracted from cascaded SiN grating waveguides is 19.7, while the continuous spiral SiN grating waveguide produces a delay time of 3.78 ns.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Jonathan Cauchon, Jean-Michel Vallee, Jonathan St-Yves, Wei Shi
Summary: The study introduces a deep learning model for reconstructing physical designs of complex coupled photonic systems from their spectral responses, enabling inverse design and fabrication diagnosis. The model demonstrates high efficiency and accuracy in device reconstruction and fabricated device evaluation, showcasing great potential for data-driven processes required by Industry 4.0.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Physics, Applied
M. Theuer, A. J. Shutler, S. Sree Harsha, R. Beigang, D. Grischkowsky
APPLIED PHYSICS LETTERS
(2011)
Review
Chemistry, Physical
Michael Theuer, Srikantaiah Sree Harsha, Daniel Molter, Garik Torosyan, Rene Beigang
Article
Physics, Applied
Michael Theuer, S. Sree Harsha, D. Grischkowsky
JOURNAL OF APPLIED PHYSICS
(2010)
Article
Physics, Applied
S. Sree Harsha, Joseph. S. Melinger, S. B. Qadri, D. Grischkowsky
JOURNAL OF APPLIED PHYSICS
(2012)
Article
Chemistry, Analytical
Yuping Yang, S. Sree Harsha, Alisha J. Shutler, Daniel R. Grischkowsky
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2012)
Article
Optics
Joseph S. Melinger, S. Sree Harsha, N. Laman, D. Grischkowsky
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2009)
Article
Optics
N. Laman, S. Sree Harsha, D. Grischkowsky, Joseph S. Melinger
Article
Optics
Joseph S. Melinger, S. Sree Harsha, N. Laman, D. Grischkowsky
Article
Physics, Fluids & Plasmas
Nagaraju Guthikonda, Elle Manikanta, Leela Chelikani, S. Sai Shiva, S. Sree Harsha, V. R. Ikkurthi, P. Prem Kiran
PHYSICS OF PLASMAS
(2020)
Article
Optics
Rajendhar Junjuri, Samuel Anurag Nalam, E. Manikanta, S. Sree Harsha, P. Prem Kiran, Manoj Kumar Gundawar
Summary: The spatial and temporal characteristics of copper (Cu) plasma generated by femtosecond laser filaments were investigated. It was found that the center of the filament is the best position to obtain maximum signal intensity and persistence time, which can enhance the application of this technique in various fields.
Article
Optics
M. M. Neethish, V. V. Ravi Kanth Kumar, Samuel Anurag Nalam, S. Sree Harsha, P. Prem Kiran
Summary: Enhanced supercontinuum generation is reported from a rare-earth (Pr3+) doped low bandgap zinc borate glass when excited with 60 fs pulses from a Ti-sapphire laser. The emission associated with the absorption bands due to Pr3+ doping (around 420-500 and 580-600 nm) is observed to assist the enhanced SCG.
Article
Optics
Samuel Anurag Nalam, S. Sree Harsha, P. Prem Kiran
Summary: Filamentation of femtosecond laser pulses in atmosphere is influenced by input laser, focusing optics, and medium characteristics. Different optical elements used for focusing the laser pulses can induce aberrations, leading to variations in filament structure and emissions. Systematic study is needed to select suitable optical elements for specific filamentation regimes of femtosecond pulses.
Article
Physics, Fluids & Plasmas
D. P. S. L. Kameswari, Nagaraju Guthikonda, S. Sai Shiva, E. Manikanta, S. Sree Harsha, V. R. Ikkurthi, P. Prem Kiran
Summary: The research focused on the interaction and evolution of two counterpropagating shockwaves generated by collinear laser induced air plasmas of equal and unequal energies. Distinct differences were observed in the hardness of the stagnation layer formed during interactions of equal energy sources and energy propagation in interactions of unequal energy sources.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Applied
Alan B. Samuel, M. M. Neethish, V. V. Ravi Kanth Kumar, Samuel Anurag Nalam, S. Sree Harsha, P. Prem Kiran
Summary: Supercontinuum generation from alkali antimony zinc borate glasses was studied using a femtosecond laser. The optical bandgap values were determined for all glass samples. Enhanced SC generation was observed in sodium-doped glass, despite its lowest bandgap among the samples. The physical and structural parameters of the glasses were analyzed and discussed, along with the observed shift in binding energies of metal cations and oxygen anions using XPS analysis. These observations provide insight into the anomaly in the enhanced SC generation from the low bandgap sodium-doped glass.
JOURNAL OF APPLIED PHYSICS
(2023)
