Article
Chemistry, Physical
Mahdi Javidnasab, Saeid Khesali Azadi, Majid Ahmadpouri Legha, Hamid Naghshara
Summary: The optical properties of novel binary gold nanohole arrays were investigated theoretically, with the optical response of the system being engineered by adjusting the contribution ratio of surface plasmon polariton (SPP) to localized surface plasmon resonance (LSPR); changes in the topology of this nanohole array affected both the intensity and wavelength of transmission peaks; the designed structure is a promising candidate for a polarization-independent optical label-free sensor.
Article
Optics
Artem I. I. Kashapov, Evgeni A. A. Bezus, Dmitry A. A. Bykov, Leonid L. L. Doskolovich
Summary: We investigate the transformation of spatiotemporal optical signals using the generalized Kretschmann setup. We demonstrate the generation of reflected optical pulses containing spatiotemporal optical vortices, which is not possible in the conventional Kretschmann configuration. Rigorous numerical simulations confirm the high-quality generation of spatiotemporal optical vortices using the investigated structure. These results have potential applications in analog optical computing and optical information processing systems.
Article
Engineering, Electrical & Electronic
Tashfiq Ahmed, A. K. M. Naziul Haque, Muhammad Anisuzzaman Talukder
Summary: Gold nanohole array-based biosensors have attracted considerable attention recently for their sensitivity, label-free biosensing, and simultaneous multiple analyte detection capabilities. However, traditional sensing methods using these biosensors lack the resolution of surface plasmon resonance sensors. This study presents numerical methods that utilize the transmission spectra of these biosensors to achieve higher sensitivity and lower detection limits, outperforming traditional techniques.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jakub Chylek, Petra Maniakova, Petr Hlubina, Jaroslav Sobota, Dusan Pudis
Summary: In this paper, simple and highly sensitive plasmonic structures are analyzed both theoretically and experimentally. The sensitivity and figure of merit of the structures are improved by increasing the thickness of the silicon dioxide overlayer. The designed structures show advantages in terms of durability and repeatability compared to commonly used structures for aqueous analyte sensing.
Article
Chemistry, Multidisciplinary
Nabarun Polley, Peter Werner, Ruth F. Balderas-Valadez, Claudia Pacholski
Summary: Attractive label-free plasmonic optical fiber sensors can be developed by cleverly choosing the arrangement of plasmonic nanostructures and other building blocks. The final response depends on the alignment and position of the individual elements. Three different types of fiber optic sensing geometries are presented in this work, fabricated by simple layer-by-layer stacking. The optical response to temperature of these sensors is investigated.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Ruth F. Balderas-Valadez, Claudia Pacholski
Summary: By combining two porous materials, namely porous silicon and plasmonic nanohole arrays, the hybrid sensor achieves increased sensitivity and dual-mode sensing capabilities. The combination of porous silicon and plasmonic nanohole arrays results in higher reflectance and improved sensitivity, making it suitable for high-sensitivity sensing applications. The hybrid sensor demonstrates significant enhancement in sensitivity and ability to perform simultaneous and independent dual-mode sensing.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Bryson Krause, Minh T. Pham, Hoang M. Luong, Tho D. Nguyen, Thang B. Hoang
Summary: Nanohole arrays can enhance the lasing emission of organic dye liquid gain medium and accelerate the decay rate of CdSe quantum dots. They are simple to fabricate, exhibit excellent optical responses, and have great potential in various emerging technologies such as gas sensing, biomedical imaging, and ultrafast on-chip coherent light sources.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Bryson Krause, Minh T. Pham, Hoang M. Luong, Tho D. Nguyen, Thang B. Hoang
Summary: Periodic arrays of air nanoholes in thin metal films can enhance light-matter interactions at the nanoscale. A simple technique of fabricating hexagonal nanohole arrays is employed, which offers excellent optical responses and can be used for enhanced lasing and spontaneous emission of novel nanomaterials.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Emilija Petronijevic, Ramin Ghahri, Concita Sibilia
Summary: This study introduces a method of coupling emitting layers with plasmonic elliptical nanohole arrays to achieve circularly dependent near-infrared and visible emission, showcasing the chiral absorption and emission properties of the design.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Cheng Hung Chu, Gu Yu Lin, Pin Chieh Wu, Wei-Yang Chou, Sy-Hann Chen, Hsing-Chih Liang, Hai -Pang Chiang
Summary: This study proposes an innovative plasmonic sensing method using MIM nanohole arrays and AgNPs to measure refractive index changes in the surrounding medium. The hybrid substrates prepared using a combination of NSL, reactive ion etching, and plasmonic site-selective photocatalytic reaction show potentials for optical sensing applications.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
Artur Movsesyan, Alina Muravitskaya, Marion Castilla, Sergei Kostcheev, Julien Proust, Jerome Plain, Anne-Laure Baudrion, Remi Vincent, Pierre-Michel Adam
Summary: In this study, the substrate-induced hybridization of plasmonic modes of a silver nanocylinder was experimentally and numerically investigated. The applications of plasmonic nanoparticles rely on their mode spectral position and near-field distribution, but introducing them into a sensing system can result in changes in mode nature and hybridization or dehybridization effects.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Lun Wang, Boyu Ji, Yang Xu, Peng Lang, Xiaowei Song, Jingquan Lin
Summary: Measuring and regulating the dephasing time of bonding and anti-bonding modes in nanosystems is crucial for the application of localized surface plasmon (LSP) devices. In this study, the modulation of the dephasing time of hybridization modes in an asymmetric nanorod dimer was investigated. The results show that the dephasing time of the antibonding mode can be as long as 10.55 fs, which is 30% longer than the dephasing time of the quadrupole mode supported by an isolated long rod. The study also demonstrates the selective modulation of dephasing times by changing the gap size or rod length in the dimer and reveals a significant difference between the peak frequencies obtained from direct measurement and from quasi-normal mode fitting.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Chemistry, Physical
Shilin Mu, Hongxu Chen, Chenyu Shi, Junhu Zhang, Bai Yang
Summary: Gold nanoring arrays with tunable plasmonic resonances can be prepared using colloidal lithography, allowing for flexible control over the dimensions of the nanorings. The plasmonic resonance spectra of the nanoring arrays can be obtained using Fourier transform near-infrared (FT-NIR) absorption spectroscopy. The prepared gold nanoring arrays exhibit a strong MR or IR plasmonic resonance which can be tuned by varying the nanoring dimensions, with potential applications in surface-enhanced spectroscopy or plasmonic sensing.
Article
Chemistry, Multidisciplinary
Hyunwoo Kim, Seunghyun Moon, Jongwoo Kim, Sang Hwan Nam, Dong Hwan Kim, Jeong Seop Lee, Kyoung-Ho Kim, Evan S. H. Kang, Kwang Jun Ahn, Taewan Kim, ChaeHo Shin, Yung Doug Suh
Summary: The study investigated photoluminescence enhancement from few-layer MoS2 transferred on Au nanostructure arrays with controlled localized surface plasmon resonance (LSPR) spectral positions. Two distinctive regimes in LSPR mode-dependent PL enhancement were revealed, with a maximum enhancement of around 40-fold at zero detuning and a modest enhancement of around 10-fold with red-shift detuned LSPR, attributed to LSPR-induced optical field enhancement and the Purcell effect, respectively.
Article
Chemistry, Multidisciplinary
Hao Tang, Guozheng Shao, Bruce J. Hinds
Summary: The study demonstrates a plasmonic flow reactor utilizing thin gold film at exits of monolithic anodized aluminum oxide membranes under LED illumination. By controlling residence time with flow rate and pore geometry, the system achieves high efficiency for peroxide activation and restricts reactions to single oxidation. The mechanism primarily involves hot electron generation from gold plasmonic response.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Sanjit Varma, Somia Sharma, Merbin John, Richa Bharadwaj, Anuj Dhawan, Shiban K. Koul
Summary: This paper introduces two compact textile-based planar dipole and loop antennas for wearable communication applications, designed and tested through simulations and experiments to consider the impact of human body positions. The antennas perform well in free space and on-body scenarios, providing return loss below -10 dB in all cases with resonant frequency close to 2.4 GHz. Observations show that the presence of the human body influences the antenna radiation pattern, making it more directive and increasing the front-to-back ratio.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
(2021)
Article
Optics
Nitin Gupta, Anuj Dhawan
Summary: A plasmonic device combining Yagi-Uda nanoantenna and bowtie nanoantenna is proposed to enhance light-matter interaction processes. Numerical simulations show significant electric field enhancements and electromagnetic enhancements, especially at near-infrared wavelengths. Both nanoantennas need to resonate at a specific wavelength to achieve maximum electric field enhancement.
Article
Chemistry, Multidisciplinary
Ajay Kumar Agrawal, Akanksha Ninawe, Anuj Dhawan
Summary: A theoretical analysis is presented for nanostructured plasmonic sensor chips, using plasmonic nanostructures on thin films for highly sensitive localized sensing. Different nanostructures are compared in terms of sensitivity and performance, with the potential for detecting multiple biomolecules simultaneously. The proposed sensors exhibit high surface sensitivity and differential reflectance for detecting thin layers of biomolecules.
Article
Energy & Fuels
Kamal Kumar, Abhijit Das, Uttam Kumar Kumawat, Anuj Dhawan
Summary: A triple-junction tandem organic solar cell with polymer active materials was presented, showing improved performance by introducing plasmonic nanospheres over the top electrode. Aluminum nanospheres were found to enhance light trapping, leading to a 14% improvement in overall short circuit current density.
ENERGY SCIENCE & ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Ajay Kumar Agrawal, Akanksha Ninawe, Anuj Dhawan
Summary: This paper reports a significantly improved sensing response of a plasmonic sensor based on a nanopillar array separated from a thin film, operated using the Kretschmann configuration. The sensor shows high sensitivity and figure of merit for both localized and bulk sensing responses. It can be easily fabricated and has great potential for biosensing applications.
IEEE SENSORS JOURNAL
(2022)
Article
Optics
Yashna Sharma, Anuj Dhawan
Summary: This study proposes active near-field plasmonic switches based on a Sierpinski-fractal contour-bowtie plasmonic nanoantenna on top of a VO2 thin film. The near-field intensity of the switch can be controlled by the phase change of VO2, leading to a switch from an OFF state to an ON state. The intensity switching ratio (ISR) of the switch can be quantified, and simulations show that higher fractal orders of the nanoantenna result in higher ISR values.
Article
Engineering, Electrical & Electronic
Abhijit Das, Ajay Kumar Agrawal, Nitin Gupta, Anuj Dhawan
Summary: In this paper, a fabrication method for LSPR sensor chips consisting of crystalline gold nanoparticles is demonstrated. The crystalline AuNPs are grown on a heated silica substrate through thermal evaporation, and nanoparticles with thickness up to 40 nm are successfully formed. This new fabrication method provides a greater potential for the performance of LSPR sensors.
IEEE SENSORS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Rajib Ratan Ghosh, Anuji Dhawan
Summary: Programmable integrated photonics is an emerging research field that utilizes phase change materials (PCMs) with non-volatile properties as the active layer for programmable photonics. In this work, hybrid device architectures utilizing the non-volatile properties of PCMs on a Si3N4 platform are investigated, and non-volatile reconfigurable reflector switches and 1x2 mode converter switches are proposed. These optical switches offer advantages such as low loss, small size, broadband operation, and low cross talk, making them suitable for applications in optical communication systems and nanophotonics.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Akanksha Ninawe, Anuj Dhawan
Summary: This paper presents the numerical investigation of several complex plasmonic nanostructures for SEIRA spectroscopy-based substrates. The proposed nanostructures exhibit substantially large SEIRA enhancement factor compared to previously reported enhancement factor values. The plasmonic properties of the proposed nanostructures have been studied and the highest SEIRA enhancement occurs at a wavelength of 6800 nm.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
Rajib Ratan Ghosh, Anuj Dhawan
Summary: In this paper, novel architectures for non-volatile directed logic circuits are presented. These circuits demonstrate low insertion losses, high extinction ratios, as well as multi-bit and broadband operations. The non-volatile switching operations are performed using a non-volatile phase change material, controlled by electro-thermal switching. The study provides a practical technique to design future high-speed nanoscale non-volatile photonic integrated circuits for logic computing applications.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2023)
Article
Optics
Yashna Sharma, Enes Dakmak, Hsiang-Kuo Yuan, Roberto Garcia, Dale Batchelor, Tuan Vo-dinh, Tushar Ghosh, Anuj Dhawan
Summary: We describe voltage-controlled surface-enhanced Raman scattering (SERS) substrates that can actively modulate SERS signals by applying voltage. These substrates employ a dielectric electroactive polymer (D-EAP) membrane with electrically-actuated active regions. Activation of these regions induces contractile strain in the SERS dye-coated nanoparticle areas of the D-EAP, resulting in enhanced SERS signals.
Article
Chemistry, Multidisciplinary
Abhijit Das, Nitin Gupta, Ajay Kumar Agrawal, Anuj Dhawan
Summary: This paper presents a method for fabricating plasmonic nanostructures over a large area for use as SERS substrates, with batch processes that can produce large numbers of substrates in a single run. The effects of different process parameters were studied to optimize sensitivity for molecule detection as low as 100 nM. The fabricated SERS substrates were also evaluated for uniformity and reproducibility, and successfully applied for label-free detection of organophosphorous pesticides.
Article
Materials Science, Multidisciplinary
Ajay Kumar Agrawal, Abhijit Das, Nitin Gupta, Kamal Kumar, Anuj Dhawan
Summary: This paper presents plasmonic switches based on vanadium dioxide (VO2) and gold nanoparticles (Au NPs) that exhibit enhanced switching of optical transmission as the temperature increases. The operating wavelength of the switch can be tuned between 650 and 1000 nm using the localized surface plasmon resonance properties of the Au NPs.
ADVANCED PHOTONICS RESEARCH
(2022)
Article
Optics
Rajib Ratan Ghosh, Anuj Dhawan
Summary: This paper demonstrates a significant enhancement of optical electromagnetic fields by combining plasmonic nanoantennas with bull's eye structures, resulting in high field enhancement and optical energy coupling through subwavelength apertures. Geometrical parameters were optimized to achieve the highest near-field enhancement, with the resonance wavelength tunable by adjusting the periodicity of the bull's eye structures. The proposed hybrid nanostructure shows great potential in various fields such as surface-enhanced Raman scattering, plasmon-enhanced fluorescence, optical trapping, and nonlinear optics.
Article
Computer Science, Information Systems
Ajay Kumar Agrawal, Akanksha Ninawe, Anuj Dhawan
Summary: A surface plasmon resonance sensing and imaging platform based on plasmonic non-uniform nano-gratings with narrow groove is proposed, showing high sensitivity and ease of fabrication.
