Article
Optics
Yi Li, Xin Yan, Xia Zhang, Chao Wu, Jiahui Zheng, Chaofei Zha, Tianyang Fu, Li Gong, Xiaomin Ren
Summary: A core-shell GaAs/InGaAs nanowire/quantum dot hybrid structure nanolaser is proposed in this study, which can enhance the spontaneous radiation rate of quantum dots to achieve higher laser intensity while reducing the threshold, paving the way for the development of ultra-small low-consumption near infrared lasers.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
S. Mirzaei-Ghormish, D. E. Smalley, M. Shahabadi, M. Mohammad-Taheri, Ryan M. Camacho
Summary: In this study, a computational analysis is conducted on the Purcell factor enhancement for a novel hybrid-plasmonic ring resonator using a novel implementation of the body-of-revolution finite-difference time-domain method. The hybrid resonator exhibits high quality-factor values and small mode volumes, making it suitable for multi-emitter applications.
Article
Physics, Applied
Ashutosh Patri, Kevin G. Cognee, Louis Haeberle, Vinod Menon, Christophe Caloz, Stephane Kena-Cohen
Summary: Optical antennas made of low-loss dielectrics, known as photonic gap antennas (PGAs), exhibit high quantum efficiency and intensity enhancement due to their unique configuration with high-index pillar structures and low-index gap materials. By optimizing the position of the gap, PGAs can provide unidirectional out-of-plane radiation and enhance spontaneous emission rates by a factor of approximately 1000 for air gaps and approximately 400 for CYTOP gaps across a spectral bandwidth of about 300 nm at a wavelength of 1.25 μm. As receivers, PGAs can also lead to a near-field intensity enhancement by a factor of about 3000 for air gaps and approximately 1200 for CYTOP gaps.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
Mohannad Al-Hmoud, Smail Bougouffa
Summary: A design for a slot-bridge nanobeam cavity with ultrahigh Q/V support and optimized far-field emission pattern has been proposed, operating at the zero-phonon transition of the nitrogen-vacancy color centers in diamond. By introducing a diamond bridge in the air region of a slotted cavity, a further reduction of mode volume is achieved. The optimized cavity design allows for high Q and small mode volume, laying the foundation for efficient single-photon sources.
RESULTS IN PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Seemesh Bhaskar, Naga Sai Visweswar Kambhampati, K. M. Ganesh, Mahesh P. Sharma, Venkatesh Srinivasan, Sai Sathish Ramamurthy
Summary: The study demonstrates a quest for auxiliary plasmonic materials with lossless properties by utilizing a unique plasmonic response from stratified high refractive index-graphene oxide and low refractive index-polymethyl methacrylate multistack. The platform achieved a zero-normal steering emission and directional graphene oxide plasmon-coupled emission, and showed potential for diverse biosensing applications. Experimental validation of the platform's superiority in achieving a low detection limit of human IFN-gamma was conducted, along with significant fluorescence emission enhancements on a lossless substrate using various nanoparticles, paving the way for unique light-matter interactions for next-generation plasmonic and biomedical technologies.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Ming Qu, Tuo Liang, Lixiao Xiao, Jirui Hou, Pengpeng Qi, Yajie Zhao, Chuanzhen Song, Jie Li
Summary: Spontaneous imbibition is a promising enhanced oil recovery method for tight reservoirs, but its mechanisms are still unclear. In this study, the mechanisms were revealed using a self-prepared novel lower-phase nano-emulsion (LWPNE). Experimental results show that LWPNE can improve the oil recovery by altering the contact angle and interfacial tension.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Haosu Zhang, Cheng Ma, Tao Wang, Jianming Miao, Xi Gong, Ruohan Zheng, Zhuo Zhao, Shiyin Zhou
Summary: The metal-dielectric cermet material is used to manipulate the dispersion properties of surface plasmon in GaN light-emitting diodes, resulting in enhanced extraction efficiency. Photoluminescence experiments confirm the effectiveness of the optimized structure.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Rodion R. Reznik, George E. Cirlin, Konstantin P. Kotlyar, Igor V. Ilkiv, Nika Akopian, Lorenzo Leandro, Valentin V. Nikolaev, Alexey V. Belonovski, Mikhail A. Kaliteevski
Summary: Control of emission directionality plays a crucial role in the development of novel nanophotonic devices based on nanowires. In this study, we demonstrate highly directional light emissions near 800 nm wavelength from core-shell AlGaAs nanowires with GaAs quantum dots, despite inefficient emission into waveguided modes. Experimental measurements show significantly higher emission intensity around the axis of the nanowire compared to perpendicular directions, suggesting that axial electric dipole transitions in quantum dots contribute to directional emissions.
Article
Materials Science, Multidisciplinary
Jing Wang, Yuanyuan Huang, Zhen Lei, Yayan Xi, Wanyi Du, Xueqin Cao, Yanqing Ge, Lipeng Zhu, Yixuan Zhou, Xinlong Xu
Summary: In this study, the spontaneous polarization and dynamical photoresponse of ferroelectric SnS nanosheets were noncontact optically characterized. The primary mechanism for THz emission was identified as shift current, and it was found to depend on the spontaneous polarization direction of the nanosheets. Furthermore, the polarization angle of the pump light could modulate the amplitude and phase of the THz wave, resulting in tunable ellipticity and orientation angle.
Article
Nanoscience & Nanotechnology
Bebeto Rai, Santhosh Bukka, Venkatesh Srinivasan, Noriyoshi Matsumi, Sai Sathish Ramamurthy
Summary: In this study, rapid decoration of titania nanotubes with noble metals using electrochemical synthesis was demonstrated, and its application as a hybrid metal-dielectric spacer and cavity material in surface plasmon-coupled emission (SPCE) platform was discussed. The significant enhancement of fluorescence signal in the SPCE platform was achieved by using the metal-dielectric spacer architecture consisting of Pt decorated titania nanotubes, Pt@TiNT, attributed to the combined effect of low plasmon loss of TiNT, increased local field excitation by Pt nanoparticles, and increased activity of TiNT by Pt decoration. Additionally, the effect of Au and Au-Pt decorated TiNT as a plasmonic substrate was also evaluated.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Optics
Chaochao Qin, Shichen Zhang, Zhongpo Zhou, Tao Han, Jian Song, Shuhong Ma, Guangrui Jia, ZhaoYong Jiao, Zunlue Zhu, Xumin Chen, Yuhai Jiang
Summary: In this study, a novel quasi-2D Ruddlesden-Popper perovskite based on 2-thiophenemethylammonium (ThMA) is synthesized using a facile solution-processed method. Additionally, an anti-solvent treatment method is proposed to tune the phase distribution and orientation of the thin films, resulting in improved energy transfer efficiency and carrier population transfer. These findings lead to the realization of low-threshold lasers and amplified spontaneous emission.
Review
Physics, Multidisciplinary
V. V. Klimov
Summary: The study of optical systems at nanoscales is crucial for creating optical and quantum computers, biosensors, DNA sequencing devices, and detectors of various fields. The properties of elementary quantum systems, such as pumping rates and decay rates, change in the nanoenvironment, which can be utilized to create nanosize light sources with desired properties. Modern research focuses on controlling the emission of elementary quantum systems using plasmonic and dielectric nanostructures, metamaterials, and metamaterial nanoparticles.
Article
Computer Science, Theory & Methods
Twisha Titirsha, Shihao Song, Anup Das, Jeffrey Krichmar, Nikil Dutt, Nagarajan Kandasamy, Francky Catthoor
Summary: This study addresses the issue of current asymmetry in memristive crossbars in neuromorphic computing systems and proposes a novel technique called eSpine to improve the lifetime of crossbars by considering the endurance variation of each memristor. The technique optimizes the mapping of machine learning workloads to ensure that synapses with higher activation are implemented on memristors with higher endurance.
IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS
(2022)
Article
Energy & Fuels
Farad Sagala, Apostolos Kantzas, Afif Hethnawi, Sepideh Maaref, Nashaat N. Nassar
Summary: Researchers have developed a stable nanofluid made from surfactant-coated nanomaterials to improve the displacement efficiency and recovery of heavy oil. It is found that this nanofluid can emulsify heavy oil with minimal agitation. By adding sodium hydroxide, the emulsification capability of the nanofluid is further enhanced. Experimental results show that this new nanofluid has a higher efficiency in enhancing oil recovery compared to traditional methods.
Article
Thermodynamics
Yin Deng, Cai-Ping Wang, Yang Xiao, Hui-Long Chen, Jun Deng, Yu-Xin Du, Guang-Xing Bai
Summary: Coal spontaneous combustion (CSC) is a significant source of greenhouse gas emissions. This study investigated the emissions of greenhouse gases during the heating and quenching processes in the low-temperature oxidation stage of different types of coal samples. The results showed that CO2 and CH4 were the main greenhouse gases emitted during the initial stage of coal oxidation. The particle size of coal had an opposite effect on greenhouse gas emissions. The emissions of CO2 and CH4 were higher in the quenching process compared to the heating process. Lower oxygen concentration reduced greenhouse gas emissions and weakened the greenhouse effect of CSC. Inert gases could weaken coal oxidation, reduce greenhouse gas emissions, and enhance gas desorption in coal.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)