Article
Nanoscience & Nanotechnology
Pei-Yuan Wu, Yun-Chorng Chang, Chen-Bin Huang
Summary: This paper demonstrates the implementation of plasmonic half-subtractor and demultiplexer circuits based on transmission lines, without the need for cascading, using the unique polarization selectivity of surface plasmon modal behaviors. The circuits can be operated using a single laser beam with predefined linear polarizations.
Article
Chemistry, Multidisciplinary
Xinghui Liu, Mengfei Xue, Jianing Chen
Summary: An on-chip integrated mid-infrared Fabry-Perot polariton resonator with broadband optical response and multi-field tunability has been achieved using surface plasmons in InAs TSL nanowires. The F-P plasmonic resonance of the nanowires was studied using a scattering-type near-field optical microscope and nano Fourier transform infrared spectroscopy. The Q factor of the resonances was found to be 5-10, indicating their potential for integrated nanophotonic circuits.
Review
Optics
Yihua Bai, Jiadian Yan, Haoran Lv, Yuanjie Yang
Summary: This review summarizes the fundamental concepts of plasmonic vortices and highlights recent advances in the generation and applications of plasmonic vortices at lightwave, microwave, and Terahertz frequencies.
Article
Physics, Multidisciplinary
Jianfei Han, Shu Zhen, Weihua Wang, Kui Han, Haipeng Li, Lei Zhao, Xiaopeng Shen
Summary: This paper introduces a broadband and highly efficient plasmonic circulator, which has been verified through simulations and experiments to have low insertion loss and high isolation in the frequency range. Additionally, an equivalent circuit model has been proposed to explain its operating mechanism.
Article
Optics
Yichen Ye, Tingting Song, Yiyuan Xie, Chuandong Li
Summary: In this paper, a novel plasmonic all-optical half-subtractor and full-subtractor are designed for optical computing. The states of the plasmonic resonators can be controlled by the pump intensity of a pump beam focused on the graphene layer, enabling the construction of all-optical switches and optical logic devices. Simulation results show that the proposed plasmonic devices can achieve half-subtraction and full-subtraction with a small feature size and fast response time.
Article
Engineering, Electrical & Electronic
Amrindra Pal, Mohammed Zaheer Ahmed, Sandip Swarnakar
Summary: All-optical logic gates have great potential in ultra-high-speed Boolean operation and logical computation. This study proposes XOR, OR, and NOT gates using metal-insulator-metal waveguides with a smaller footprint than previously reported. The device's performance is analyzed using the finite-difference time-domain method (FDTD) and verified through MATLAB simulation, with an extinction ratio of 27.80 dB. These logic gates can serve as key components in optical communication and pave the way for new designs in plasmonic integrated circuits.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Optics
L. Avalos, A. K. Gonzalez-Alcalde, E. Chaikina, E. E. Garcia-Guerrero, A. A. Maradudin, E. R. Mendez
Summary: The study investigates the optical properties of metallic lamellar gratings with sub-wavelength period as a function of groove depth and width. Anomalies are observed under p-polarized illumination due to the excitation of surface plasmon polaritons (SPPs) and their interaction with plasmonic and photonic modes. The propagation constant of SPPs is affected by the presence of corrugations, with new resonances appearing for grooves deeper than half a wavelength.
OPTICS COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Mengchao Guo, Xiaokun Wang, Haiyan Zhuang, Dongming Tang, Baoshan Zhang, Yi Yang
Summary: In this paper, high-contrast gratings based spoof surface plasmon polaritons (HCG-based SSPPs) are used to enhance the bandwidth of all-dielectric metamaterial absorbers (ADMMAs). A carbon black composite is used to design a broadband ADMMA, which consists of a cylinder array structure. Simulation results show that a broadband absorption from 6.1 GHz to 18 GHz is achieved with three absorption peaks under a total thickness of 3.9 mm. The first peak is attributed to HCG-based SSPPs, while the other two are attributed to diffraction effects. The improved impedance matching characteristic in a wide band also contributes to the enhancement. Experimental results roughly agree with the simulations. Moreover, the designed structure is not a standard HCG, indicating the potential universality of HCG-based SSPPs in ADMMAs. It is believed that this work will stimulate further research on the applications of HCG-based SSPPs in ADMMAs.
Article
Chemistry, Multidisciplinary
Junxiong Guo, Yu Liu, Lin Lin, Shangdong Li, Ji Cai, Jianbo Chen, Wen Huang, Yuan Lin, Jun Xu
Summary: This study presents a novel optical synapse based on surface plasmon resonance polarizer for implementing convolutional filters and optical convolutional neural networks. The synapse consists of nanoscale crossed gold arrays that strongly respond to the polarization angle of incident light. The experimental results show that the presented synapse achieved excellent performance in classifying the MNIST handwritten digit data set, with a classification accuracy of over 98% after training on 1,000 images and testing on a separate set of 10,000 images. This research provides a promising approach for designing artificial neural networks with efficient hardware and energy consumption, low cost, and scalable fabrication.
Article
Optics
Lokendra Singh, Reshu Saxena, Guo Zho, Chinmoy Saha, Prakash Pareek
Summary: The one-to-one mapping in reversible logic gates prevents information loss and shows potential applications in various fields. The proposed all-optical compact circuit utilizes an MIM waveguide-based MZI to function Feynman reversible and NOR logic gates.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Chuangye Zhang, Changjun Min, Yuquan Zhang, Yanan Fu, Ling Li, Yulong Wang, Xiaocong Yuan
Summary: We propose and theoretically study a chiral plasmonic lens structure for the detection of cylindrical vector beams (CVBs). The structure can generate a single plasmonic focus, whose position depends on the incident angle and polarization order of the CVB. The incident CVB can be detected based on the focal position and incident angle, with the use of a coupling waveguide to avoid imaging of the entire plasmonic field. This structure shows great potential in applications such as CVB-multiplexing integrated communication systems.
CHINESE OPTICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jie Xu, Yamei Luo, Sanshui Xiao, Fengwen Kang, Kosmas L. Tsakmakidis
Summary: This study proposes an all-optical digital logical system based on unidirectional modes in the microwave regime, which can achieve continuous broadband operation for basic logic gates. Utilizing the concept of negative logic, the system exhibits low-loss, broadband, and robust characteristics, and has the potential for multi-input and/or multi-output logical functionalities, making it promising for parallel computation. The numerical simulations and theoretical analyses support the feasibility of this system.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Martin Thomaschewski, Vladimir A. Zenin, Saskia Fiedler, Christian Wolff, Sergey I. Bozhevolnyi
Summary: This study utilizes plasmonics to achieve the most efficient lithium niobate Mach-Zehnder modulator (MZM) to date. By guiding plasmonic modes and controlling their relative optical phase delay with electrical signals, efficient electro-optic modulation is achieved. The proposed MZM operates near its quadrature point to ensure high linearity.
Article
Materials Science, Multidisciplinary
Xinxin Gao, Bao Jie Chen, Kam-Man Shum, Qian Ma, Wen Yi Cui, Tie Jun Cui, Chi Hou Chan
Summary: The next-generation wireless communications and intrachip and interchip communications require high-speed terahertz (THz) interconnects, which can be achieved using spoof surface plasmon polaritons (SSPPs). This study proposes and experimentally demonstrates planar multifunctional THz plasmonic devices based on the interaction between SSPPs and spoof localized surface plasmon (SLSPs). These devices enable pass-through transmission, multifrequency resonances, and phase shift in THz plasmonic systems, making them promising for on-chip integrations, wireless communications, and sensing systems.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Nanoscience & Nanotechnology
Ayanna Shorter, Md Golam Rabbani Chowdhury, Sangeeta Rout, Mikhail A. A. Noginov
Summary: We studied the reflection spectra of dye-doped and undoped polymers on Ag and Au substrates and found anomalous dips in the UV range. The dips observed on Ag substrates were close to singularities in the refractive indexes of SPPs at the Ag-polymer interface. The dips observed on Au substrates were more pronounced, broader, and shifted to shorter wavelengths, and their spectral positions had large standard deviations compared to those on Ag substrates.
Article
Nanoscience & Nanotechnology
Ching-Han Mao, Abhishek Dubey, Fang-Jing Lee, Chun-Yen Chen, Shin-Yi Tang, Ashok Ranjan, Ming-Yen Lu, Yu-Lun Chueh, Shangjr Gwo, Ta-Jen Yen
Summary: This study proposes an approach to enhance 2D MoS2 photosensing by combining plasmonic nanostructures and physical suspension, resulting in a hybrid structure with high responsivity and large active area. The gateless responsivity of the hybrid structure reaches 402.4 A/W at a wavelength of 532 nm, representing the highest value reported for gateless plasmonic MoS2 photodetectors. The exceptional detectivity of 2.34 x 10(12) Jones highlights the potential of this approach for designing high-performance 2D TMDC-based optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Chun-Yuan Wang, Yungang Sang, Xinyue Yang, Soniya S. Raja, Chang-Wei Cheng, Haozhi Li, Yufeng Ding, Shuoyan Sun, Hyeyoung Ahn, Chih-Kang Shih, Shangjr Gwo, Jinwei Shi
Summary: This study demonstrates a strong coupling system achieved by coupling localized surface plasmon modes. Under specific conditions, a root N scaling of Rabi splitting energy is observed, along with a confirmed giant Rabi splitting in the visible spectral range. Additionally, the coupling strength reaches the ultrastrong coupling regime in some cases, representing about 10% of the mode energy.
Article
Nanoscience & Nanotechnology
Chang-Wei Cheng, Soniya S. Raja, Ching-Wen Chang, Xin-Quan Zhang, Po-Yen Liu, Yi-Hsien Lee, Chih-Kang Shih, Shangjr Gwo
Summary: Aluminum has emerged as a promising alternative plasmonic material due to its unique optical properties and material advantages. Epitaxial growth technique enables high-fidelity nanofabrication and wafer-scale system integration, with controllable aluminum film thickness down to a few atomic monolayers.
Article
Chemistry, Multidisciplinary
Yungang Sang, Chun-Yuan Wang, Soniya S. Raja, Chang-Wei Cheng, Chiao-Tzu Huang, Chun-An Chen, Xin-Quan Zhang, Hyeyoung Ahn, Chih-Kang Shih, Yi-Hsien Lee, Jinwei Shi, Shangjr Gwo
Summary: The study introduces a diffraction-unlimited approach using tunable plasmonic resonance and coupling strength, which can be applied in non-Hermitian photonics with features like seamless integration of two-dimensional materials, broadband tuning, and operation at room temperature.
Article
Chemistry, Physical
Ragini Mishra, Ching-Wen Chang, Abhishek Dubey, Zong-Yi Chiao, Ta-Jen Yen, Ho Wai Howard Lee, Yu-Jung Lu, Shangjr Gwo
Summary: Titanium nitride (TiN) is an emerging material with excellent optical properties and high-temperature mechanical hardness. Recently, TiN plasmonic metasurfaces have shown promising applications as absorbers and thermal emitters, demonstrating high absorptivity and thermal stability when grown by nitrogen-plasma-assisted molecular beam epitaxy.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Khant Minn, Aleksei Anopchenko, Ching-Wen Chang, Ragini Mishra, Jinmin Kim, Zhenrong Zhang, Yu-Jung Lu, Shangjr Gwo, Ho Wai Howard Lee
Summary: Room-temperature photoluminescence enhancement of molybdenum disulfide monolayers on epitaxial titanium nitride thin films is observed, with stronger enhancement as titanium nitride becomes more metallic, especially at excitation wavelengths equal to or longer than the titanium nitride's epsilon-near-zero (ENZ) wavelength. The enhancement is attributed to increased excitation field in molybdenum disulfide at titanium nitride's ENZ wavelength and interference effects for thick spacers that separate molybdenum disulfide flakes from titanium nitride films in the metallic regime.
Article
Chemistry, Multidisciplinary
Abhishek Dubey, Ragini Mishra, Chang-Wei Cheng, Yu-Ping Kuang, Shangjr Gwo, Ta-Jen Yen
Summary: In the field of life science, rapid mutation detection in oligonucleotides is crucial for genomic and medical screening. Utilizing an epitaxial aluminum deep-UV SERRS substrate, researchers have successfully obtained SERRS spectra for all bases of oligonucleotides for the first time, demonstrating significant enhancements in Raman signals and the ability to quantify single-base mutations in ss-DNA.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
I. Hong Ho, Ching-Wen Chang, Yen-Lin Chen, Wan-Yu Chang, Ting-Jui Kuo, Yu-Jung Lu, Shangjr Gwo, Hyeyoung Ahn
Summary: This study successfully grows ultrathin TiN films with excellent surface morphology and high optical transparency using nitrogen plasma-assisted molecular-beam epitaxy (MBE) method. The films exhibit good dielectric properties and electrical conductivity, making them suitable for robust, low cost, and large-area transparent conductive electrodes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Le Thi Quynh, Chang-Wei Cheng, Chiao-Tzu Huang, Soniya Suganthi Raja, Ragini Mishra, Meng-Ju Yu, Yu-Jung Lu, Shangjr Gwo
Summary: This article demonstrates the growth of aluminum (Al), copper (Cu), gold (Au), and silver (Ag) epitaxial films on two-dimensional muscovite mica substrates using van der Waals heteroepitaxy. The resulting plasmonic metal films on mica offer the ability to design and fabricate controlled plasmonic nanostructures with tunable surface plasmon resonances. The use of these films enables the development of plasmonic sensors and plasmonic color filters with high performance.
Article
Nanoscience & Nanotechnology
Ragini Mishra, Abhishek Dubey, Ching-Wen Chang, Ashok Ranjan, Ming-Yen Lu, Ta-Jen Yen, Shangjr Gwo
Summary: This study demonstrates an efficient hot-hole injection mechanism based on a metal-semiconductor heterostructure, which can be used for optical sensing and solar energy harvesting. By optimizing the material structure, the photocurrent conversion efficiency is significantly increased, and an internal photovoltage enables self-sustainable photocurrent generation.
Article
Chemistry, Physical
Aanchal Agarwal, Yan-Ting Liu, Yu-Sheng Huang, Chang-Wei Cheng, Shyam Narayan Singh Yadav, Ta-Jen Yen, Shangjr Gwo, Ming -Yen Lu, Lih-Juann Chen
Summary: The effects of high-k dielectric materials MoO3 and Ta2O5 as interlayers on the lasing thresholds of ZnO/high-k material/Al nanolasers have been investigated. The results showed that these high-dielectric-constant materials can be used to construct low threshold surface-plasmon polariton lasers. By inserting MoO3 and Ta2O5 films between the Al film and ZnO nanowires, material losses are reduced and optical confinement is enhanced.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Zhen-Ting Huang, Ting-Wei Chien, Chang-Wei Cheng, Cheng-Ching Li, Kuo-Ping Chen, Shangjr Gwo, Tien-Chang Lu
Summary: Stable electrical modulation of plasmonic nano-lasers is achieved on a hybrid graphene-insulator-metal (GIM) platform at room temperature. A zinc oxide (ZnO) nanowire is placed on the GIM platform to create a plasmonic cavity, and the graphene layer is used for electrical modulation. The lasing thresholds of the ZnO nanowire plasmonic nanolasers on the GIM platform can be modulated by the gate voltage, demonstrating high potential for plasmonic circuit applications.
Article
Chemistry, Physical
I-Hung Ho, Ching-Wen Chang, Sheng-Kai Wen, Yu-Jung Lu, Shangjr Gwo, Hyeyoung Ahn
Summary: Titaniumnitride is a refractory material with excellent thermaland mechanical stabilities and optical and plasmonic properties in the visible and near-infrared regions. Alloying aluminum in TiN can change its dielectric properties and tune the epsilon-near-zero wavelength. Understanding the role of Al in the transient optical responses of Ti1-x Al (x) N is crucial for optoelectronic and photothermal applications. This study investigates the broadband transient reflectance of Ti(1-x)Al(x)N films with different Al concentrations and reveals their potential as efficient absorbing layers for photovoltaic cells. Moreover, it provides insights into the carrier dynamics and e-ph coupling processes in TiN and TiAlN.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Zhen-Ting Huang, Ting-Wei Chien, Chang-Wei Cheng, Cheng-Ching Li, Kuo-Ping Chen, Shangjr Gwo, Tien-Chang Lu
Summary: Stable electrical modulation of plasmonic nanolasers is achieved on a graphene-insulator-metal platform, where the gate voltage can adjust the lasing thresholds of the ZnO nanowire plasmonic nanolasers, providing high-speed modulation characteristics.
Article
Materials Science, Multidisciplinary
Shuoyan Sun, Yufeng Ding, Haozhi Li, Peng Hu, Chang-Wei Cheng, Yungang Sang, Fengzhao Cao, Yue Hu, Andrea Alu, Dahe Liu, Zhaona Wang, Shangjr Gwo, Dezhuan Han, Jinwei Shi
Summary: This study successfully observed symmetry-protected plasmonic BICs in a one-dimensional all-metallic grating within the visible range, demonstrating topological band inversion and engineering off-Gamma-point BICs. Experimental results confirmed a Q factor exceeding 60, with simulation showing potential for over 200 with more grooves. The findings open up promising applications in lasers, sensors, light-matter interactions, nonlinear optics, and quantum optics.
