Article
Optics
Tetsushi Takano, Hisashi Ogawa, Chiaki Ohae, Masayuki Katsuragawa
Summary: A high-power injection-locked titanium:sapphire laser with a low-loss cavity configuration was reported, achieving 10 W single-frequency oscillation with a good transverse mode and a slope efficiency of 5170.
Article
Nanoscience & Nanotechnology
Hui Liu, Haoran Yu, Lun Dai, Zhi Li, Jianjun Chen
Summary: The IPWP method reduces the spatial mismatch between laser modes and sources, reducing the pump power threshold and narrowing the laser linewidth of perovskite microlasers. The method has the potential for applications in low-energy and high-density microlasers and photonic integrated circuits.
Article
Chemistry, Multidisciplinary
Junfeng Lu, Xiaopeng He, Juan Xu, Fangtao Li, Qingbin Tang, Xiaoxuan Wang, Jun Dai, Qiushi Yao, Feifei Qin, Chunxiang Xu
Summary: In this study, CsPbBr3 microwires were used as gain media and microresonators to achieve two-photon pumped frequency upconversion single-mode lasing. Theoretical calculation and experimental validation showed that CsPbBr3 microwires possess the capability to achieve this output, and the relationship between exciton binding energy and light emission was extracted.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yen-En Liu, Xu Shi, Tomohiro Yokoyama, Soshun Inoue, Yuji Sunaba, Tomoya Oshikiri, Quan Sun, Mamoru Tamura, Hajime Ishihara, Keiji Sasaki, Hiroaki Misawa
Summary: Modal strong coupling between localized surface plasmon resonance and a Fabry-Pe'rot nanocavity has been studied to improve the quantum efficiency of artificial photosynthesis. In this research, we employed Au nanodisk/titanium dioxide/Au film modal strong coupling structures to investigate the mechanism of quantum efficiency enhancement.
Article
Chemistry, Analytical
Jaeran Lee, Ji Won Ha
Summary: In this study, the effect of DNA chains on the surface of gold nanoparticles was investigated. The length of the chains, the direction of DNA attachment, and the guanine-rich sequences all have an impact on the spectral changes of the nanoparticles. Additionally, the potential for label-free detection of DNA hybridization on gold nanoparticles was demonstrated.
ANALYTICAL CHEMISTRY
(2022)
Article
Optics
Tianlang Chen, Chunxiang Xu, Daotong You, Ru Wang, Yizhi Zhu, Jinping Chen, Qiannan Cui, Zengliang Shi
Summary: This study successfully achieved low threshold and high quality factor of CsPbBr3 single-mode micro-laser by selecting proper sized CsPbBr3 single crystal microdisks and introducing surface plasmon of detachable Pt nanoparticles on the microcavity.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Lidan Jiang, Leilei Shi, Jing Luo, Qirui Gao, Miaoxin Bai, Tianyi Lan, Paul Ikechukwu Iroegbu, Laiyang Dang, Ligang Huang, Tao Zhu
Summary: Simultaneous self-injection locking of two VCSELs to a single microcavity is demonstrated, reducing linewidths and suppressing frequency noises effectively. This method may be applied to multi-wavelength laser arrays with low phase and frequency noise.
Article
Engineering, Electrical & Electronic
Zhengkang Wang, Jianming Shang, Yanfei Xu, Yaojun Qiao, Song Yu
Summary: A novel single-longitudinal mode erbium-doped fiber laser with ultra-narrow linewidth and high stability is proposed and experimentally demonstrated, utilizing an all polarization-maintaining ring cavity. Components such as PDSR and self-injection loop contribute to the improved performance of the laser.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Optics
Meng Zou, Kai Shen, Qingguo Song, Yuze Dai, Xiangpeng Xiao, Qizhen Sun, Zhijun Yan
Summary: In this study, we proposed an integrated all-fiber sub-kHz-linewidth distributed feedback fiber laser (DFB-FL) assisted by self-injection locking. By using a pi phase-shifted fiber Bragg grating (pi-FBG), single longitudinal mode operation was achieved. Experimental results showed that the apodized pi-FBG based laser cavity had higher slope efficiency and narrower linewidth compared to a normal grating. The self-injection locking mechanism was employed to further compress the linewidth and reduce the relative intensity noise (RIN) peak.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Laiyang Dang, Ligang Huang, Yulong Cao, Yujia Li, Paul Ikechukwu Iroegbu, Tianyi Lan, LeiLei Shi, Guolu Yin, Tao Zhu
Summary: The study introduced a novel semiconductor optical amplifier fiber laser that successfully improved linewidth and suppressed side longitudinal modes, demonstrating the effectiveness of high scattering fiber in enhancing feedback intensity and providing an effective mechanism for longitudinal mode operation in highly coherent lasers.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Ahmed A. Saleh Falah, Wei Ru Wong, Faisal Rafiq Mahamd Adikan
Summary: A single-mode eccentric-core D-shaped photonic crystal fiber surface plasmon resonance sensor with tailored critical properties for practical network-integrable applications has been proposed. The sensor offers high sensitivity, resolution, and linear response, and can be fabricated using a comparatively simpler stack-and-draw method based on standard materials.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Erping Deng, Luhong Xie, Lixin Wu, Haiyang Cao, Maoyang Pan, Ying Zhang, Yuxing Yan, Yongzhang Huang, Lijian Ding
Summary: This article examines the influence of load current injection modes (saturation mode and threshold mode) on the failure mechanism and lifetime of insulated gate bipolar transistors (IGBTs) during standard dc power cycling. Six groups of power cycling tests were conducted under nearly identical conditions, using two different current injection modes and two different packages. The failure mode after power cycling was confirmed through online monitoring of electrical and thermal parameters and scanning acoustic micrography. The failure mechanism was analyzed and the power cycling lifetime was compared and explained using finite element simulations. The results showed that the threshold load current injection mode can significantly reduce the load current for the desired junction temperature swing. However, it also altered the power cycling lifetime and failure mechanism, particularly in devices with bond wire failure. Therefore, it is not recommended for evaluating power cycling lifetime.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Liangyu Wang, Hong Li, Jie Zheng, Ling Li
Summary: In this study, a low-symmetry Al nanoellipse metasurface on Al substrate was theoretically designed, which successfully achieved an ultranarrow linewidth of 1.9 nm in the near-UV region (400 nm). The ultranarrow linewidth was also successfully modulated to the deep-UV region by adjusting structural parameters. This work aims to provide a theoretical basis and prediction for applications such as UV sensing and UV-SERS.
Article
Chemistry, Analytical
Pengfei Zhang, Rui Wang, Zijian Wan, Xinyu Zhou, Guangzhong Ma, Jayeeta Kolay, Jiapei Jiang, Shaopeng Wang
Summary: The article introduces a total internal reflection-based evanescent scattering microscopy technique that can detect single proteins without labeling and provides a high-precision measurement method for protein binding kinetics.
ANALYTICAL CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
M. Z. Alam, Z. Yang, M. Sheik-Bahae, J. S. Aitchison, M. Mojahedi
Summary: Plasmonics is a promising technology with applications in nanophotonics and biosensing, utilizing interference of light to achieve highly directional surface plasmon excitation for various purposes such as plasmonic waveguides and optical sensing.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Mohammed Alaloul, Jacob B. Khurgin
Summary: This article presents a practical design of an all-optical modulator based on graphene and hexagonal boron nitride (hBN) heterostructures. The interaction between graphene and guided light is enhanced by nanophotonic means, achieving high extinction ratio, low insertion loss, and energy-efficient switching. The device exhibits ultrafast switching with short recovery time and has the potential to be a high-performance all-optical modulator with ultra-high bandwidth. It is expected to meet the needs of next-generation photonic computing systems.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Paul A. Morton, Chao Xiang, Jacob B. Khurgin, Christopher D. Morton, Minh Tran, Jon Peters, Joel Guo, Michael J. Morton, John E. Bowers
Summary: This paper introduces a new Integrated Coherent Tunable Laser (ICTL) that offers ultra-wideband wavelength tuning and ultra-low noise performance. The ICTL is designed to be cost-effective and reliable through its utilization of III-V material and a CMOS foundry based Silicon Photonics platform. The ICTL's exceptional laser reflector performance, extended laser cavity length, and low linewidth and phase noise enable highly-coherent output. The ICTL has achieved record integrated laser performance and shows great potential for next-generation applications such as WDM transmission systems, fiber-optic and medical-wearable sensing systems, and automotive LiDAR systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jacob B. Khurgin, Volker J. Sorger, Rubab Amin
Summary: This study compares the performance of different types of electro-optic modulators to investigate whether modulators based on emerging electro-optic materials have fundamental performance advantages. The results show that for conventional wavelength scale photonic waveguides, field-driven modulators always outperform charge-driven modulators in terms of energy and speed. However, for waveguides with a sub-wavelength optical mode, such as plasmonics-assisted waveguides, the emerging charge-driven devices are highly competitive, especially for applications where component-density on-chip is a factor.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Jacob B. Khurgin
Summary: While the photonics community is focused on exotic concepts, the simple idea of increasing the refractive index may have greater potential in various applications. The author explores why higher index materials have not yet been developed and suggests some tentative directions for finding these elusive materials, whether natural or artificial.
Article
Nanoscience & Nanotechnology
Yaliang Gui, Behrouz Movahhed Nouri, Mario Miscuglio, Rubab Amin, Hao Wang, Jacob B. Khurgin, Hamed Dalir, Volker J. Sorger
Summary: The article introduces a compact electro-optic modulator based on ITO thin films and Mach-Zehnder interferometers, capable of high switching rates and integrating a large number of modulators within the same chip area. The design includes photonics, electronics, and RF optimization, with an asymmetric MZI tuning step proposed to optimize the extinction ratio and insertion loss.
Article
Chemistry, Multidisciplinary
Haonan Ling, Jacob B. Khurgin, Artur R. Davoyan
Summary: Layered van der Waals materials provide unique atomic-void channels with subnanometer dimensions, offering opportunities for advanced applications such as sensing and quantum information. Theoretical limits of light guiding in these channels show that materials with strong resonances, excitonic and polaritonic properties are ideal for deeply subwavelength light guiding. Transition metal dichalcogenides with excitonic properties can concentrate over 70% of optical power within them.
Article
Chemistry, Multidisciplinary
Eviatar Minerbi, Symeon Sideris, Jacob B. Khurgin, Tal Ellenbogen
Summary: We study the nonlinear THz emission from plasmonic metasurfaces and find that a thin ITO film significantly affects the system's nonlinear dynamics. The presence of the ITO film leads to a much stronger THz emission compared to a metasurface on glass, with a different dominant emission mechanism. The hot-electron dynamics in the system strongly modify the coupling between the metasurface and the free electrons in the ITO, resulting in dynamic THz emission phenomena that were not observed before.
Article
Optics
Mohammed Alaloul, Jacob B. Khurgin, Ibrahim Al-Ani, Khalil As'ham, Lujun Huang, Haroldo T. Hattori, Andrey E. Miroshnichenko
Summary: This research proposes a simple model to evaluate the performance of a Si3N4 waveguide-integrated all-optical MoSe2 modulator, and obtains important parameter values such as switching energy, extinction ratio, and insertion loss. The device operates with ultrafast recovery time and high extinction ratio, suitable for practical applications.
Editorial Material
Nanoscience & Nanotechnology
Jacob B. Khurgin
NATURE NANOTECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Mohammed Alaloul, A. M. Al-Ani, Khalil As'Ham, Jacob B. Khurgin, Haroldo T. Hattori, Andrey E. Miroshnichenko
Summary: On-chip integration of mid-wave infrared (MWIR) absorption spectroscopy gas sensors allows for mass production of compact and inexpensive devices, enabling applications in environmental monitoring, quality control, and Internet-of-Things networks. The proposed MWIR graphene photodetector integrated into silicon-on-sapphire (SOS) slot waveguides enhances electric field distribution and absorption capabilities, enabling sub-ppb detection of greenhouse gases. These findings pave the way for the development of portable, inexpensive, and highly sensitive sensors integrated into miniaturized electronic-photonic chipsets.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Jacek Gosciniak, Zibo Hu, Martin Thomaschewski, Volker Sorger, Jacob B. B. Khurgin
Summary: This article proposes a novel bistable resonator-free all-optical waveguide device based on indium tin oxide as a nonlinear epsilon-near-zero material. The device offers a cost-effective and high-performance photonic platform for optical logic and information processing in the next generation optical networks and photonic neural systems. It is compatible with silicon photonics, enabling sub-picosecond operation speeds with moderate switching power. The device can act as an optical analogue of memristor or thyristor and can become an enabling element of photonic neural networks not requiring OEO conversions.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Jacob B. Khurgin
Summary: In recent decades, progress in developing better nonlinear materials has been slower than desired. The author suggests that this may be due to the length of interaction time between photons and matter being the main determinant of nonlinear optical phenomena. Tentative approaches to improve the efficiency of nonlinear optical phenomena are proposed.
Editorial Material
Engineering, Electrical & Electronic
Xinxing Zhou, Jacob Khurgin, Shenhe Fu
IEEE PHOTONICS JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Jacob B. Khurgin
Summary: Optical isolators are important components in optical networks. Magneto-optic isolators have low power consumption but are not suitable for on-chip integration. Temporal modulation of the dielectric constant offers an alternative method, but has its own drawbacks. This research examines various methods of optical isolation using temporal modulation and finds that regardless of the method used, there are constraints on footprint, modulation frequency, and power consumption to achieve full isolation without excessive insertion loss. The estimated power consumption with current and near-future materials is at least 100 mW, and the acceptability of this requirement depends on the progress of magneto-optic and time-modulated integrated technologies.
Article
Optics
Chunhua Wang, Jacob B. Khurgin, Huakang Yu
Summary: A Ti:Sapphire laser pumped directly with four green laser diodes has been demonstrated to achieve high power continuous-wave output, improving laser efficiency without sacrificing beam quality.