Article
Optics
Mohsen Samadi, Pooya Alibeigloo, Abolfazl Aqhili, Mohammad Ali Khosravi, Farahnaz Saeidi, Shoaib Vasini, Mostafa Ghorbanzadeh, Sara Darbari, Mohammad Kazem Moravvej-Farshi
Summary: Plasmonic tweezers are indispensable tools for manipulating micro and nano-objects with high precision, utilizing surface plasmon technology to trap particles beyond the diffraction limit. Trapping-potential landscape can be reconfigured by designing plasmonic nanostructures.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Hao Song, Huibin Zhou, Kaiheng Zou, Runzhou Zhang, Kai Pang, Haoqian Song, Xinzhou Su, Amir Minoofar, Nanzhe Hu, Cong Liu, Robert Bock, Brittany Lynn, Shlomo Zach, Moshe Tur, Alan E. Willner
Summary: In this study, a tunable, broadband pixel-array-based integrated receiver was experimentally used for recovering orbital-angular-momentum (OAM) multiplexed channels. The receiver consists of a pixel-array mode converter, four phase controllers, and a pixel-array 4-to-3 coupler, enabling the reception and routing of OAM beams. Experimental results demonstrate the high-quality data transmission capability of the receiver within a broad bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Fan Yang, Kun Ding, John Brian Pendry
Summary: Surface plasmons at an interface between dielectric and metal regions can be made arbitrarily compact normal to the interface by introducing extreme anisotropy in the material parameters. By using a metamaterial structure comprising a square array of gold cylinders and tuning the filling factor, the desired material parameters can be achieved. However, the study shows that the unit cell dimensions of the metamaterial are the limiting factor in the degree of localisation achieved in simulations.
Article
Physics, Applied
Xin Zheng, Jingjing Zhang, Yu Luo, Zhengxing Wang, Yi Ren, Tie Jun Cui
Summary: Plasmon antennas can enhance electromagnetic fields at a hotspot, but the challenge lies in increasing radiation efficiency without changing the emitter's radiation behavior.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Li Ma, Zijun Zhan, Chao Chen, Chunxiang Liu, Chuanfu Cheng
Summary: Control of orbital angular momentum is crucial for ultrashort pulses. We propose an approach for mode selection using an optical mask with a spiral array, which allows flexible generation of structured orbital angular momentum modes.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Victor Pacheco-Pena, Toby Hallam, Noel Healy
Summary: MXenes, as an emerging class of two-dimensional materials, show significant potential for use in next generation optoelectronic sensors. By tuning the plasma frequencies, they can produce plasmon resonances across different spectral ranges, adding a degree of freedom to the sensing mechanism.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Physical
Pengwei Li, Hongfang Wang, Zulhumar Turup, Xiaoyu Yang, Jingyu Wang, Min Gao
Summary: Efficiently manipulating plasmonic modes by adjusting geometry, spatial arrangement, and the nature of the material has shown great potential in ultrasensitive sensing, optical modulation, and surface-enhanced spectroscopy. Symmetry breaking as an effective geometry-controlled method can induce plasmonic hybridization and further tune resonant wavelength, strength, and electromagnetic fields. Theoretical design of a symmetry-breaking Ag nano-cube with an introduced cavity along the lateral edges allows for arbitrary tuning of plasmonic modes based on plasmon hybridization theory. This research provides insight into the mechanism of light-matter interactions and paves the way for efficient nanophotonic platforms in plasmon-enhanced spectroscopy and optical wave manipulations.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Xiaoping Cao, Nan Zhou, Shuang Zheng, Shengqian Gao, Yuntao Zhu, Mingbo He, Xinlun Cai, Jian Wang
Summary: We design and fabricate a digitized subwavelength surface structure on a silicon platform using the DBS optimization algorithm for the generation of wavelength-/polarization-/charge-diverse optical vortices. The structure has an ultra-compact footprint and ultra-wide bandwidth, supporting high-order OAM modes with high purity. The experimental results show favorable performance in terms of mode crosstalk and demonstrate the possibility of generating higher-order OAM modes. This research provides new perspectives for chip-scale solutions to multi-dimensional multiplexing optical communications.
Article
Optics
Peng Luo, Wei Wei, Guilian Lan, Xingzhan Wei, Liya Meng, Yan Liu, Juemin Yi, Genquan Han
Summary: The anisotropic PIT metamaterial device based on a graphene-black phosphorus heterostructure offers a dual-polarization tunable PIT effect, with the coupling strength of the system modulated by dynamically manipulating the Fermi energy of the graphene. This device provides additional degrees of freedom in realizing universal tunable functionalities, which could significantly promote the development of integrated optical processing chips, optical modulation, and slow light devices.
Article
Chemistry, Multidisciplinary
Tao Sun, Chun Zhou, Hongli Guo, Zhi Meng, Xinyu Liu, Zhou Wang, Han Zhou, Yuming Fei, Kang Qiu, Fapei Zhang, Bolin Li, Xuetao Zhu, Fang Yang, Jimin Zhao, Jiandong Guo, Jin Zhao, Zhigao Sheng
Summary: This article demonstrates a method to generate GHz optical birefringence in SrTiO3 crystals and manipulate it. By using ultrafast laser pumping, low damping coherent acoustic phonons are created in the transducer/STO structures. Through studying a series of transducer layers, a semiconducting LaRhO3 film with relatively high photon-phonon conversion efficiency is obtained. The most interesting finding is that the GHz optical birefringence induced by coherent acoustic phonons in STO exhibits crystal orientation dependence. Optical manipulation of both coherent phonons and its induced GHz birefringence by double pump technique is also achieved.
Article
Materials Science, Multidisciplinary
Weijing Kong, Shuna Li, Rui Meng, Xiaochang Ni
Summary: The study demonstrates the realization of a wavelength interrogated Bloch surface wave device structure by introducing a dielectric grating metasurface. The manipulation of the Bloch surface wave mode by tuning the structural parameters for high-sensitive optical sensing applications has been verified through theoretical and numerical investigations. The structure shows potential in tuning resonance wavelength and determining Bloch surface mode in the band-gap.
RESULTS IN PHYSICS
(2021)
Review
Materials Science, Multidisciplinary
Xuanru Zhang, Wen Yi Cui, Yi Lei, Xin Zheng, Jingjing Zhang, Tie Jun Cui
Summary: Localized surface plasmons (LSPs) in metal nanoparticles are highly sensitive to the dielectric environment, making them ideal sensors. The concept has expanded to spoof LSPs in microwave and terahertz frequencies, offering deep-subwavelength confinement and sensitivity enhancement with low loss. Advances in technology have enabled applications in various fields such as liquid sensing, gas sensing, and wearable sensing.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Optics
Eduardo Peters, Gustavo Funes, L. Martinez-Leon, Enrique Tajahuerce
Summary: The subject of calculating the topological charge or vortex strength of optical vortices has generated divided opinions among scientists due to the difficulty in supporting proper analytical results from the experimental point of view. This work presents numerical data that shows the limitations of measuring topological charge for practical fractional vortices and the challenges that high order measurements may pose, and introduces a new strength staircase for practical vortices.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Binjie Gao, Jisen Wen, Guiyuan Zhu, Linhua Ye, Li-Gang Wang
Summary: Experimental demonstration of the manipulation and precise measurement of microparticle rotation at the focal plane of fractional vortex beams. The measured orbital angular momentum is roughly proportional to the fractional OAM of the beams. Average trap stiffness obtained from power spectra evaluation provides insight into the trapping strength of practical focused FVB intensity ring.
Article
Engineering, Electrical & Electronic
Santosh Kumar Sahu, Samyuktha K. Reddy, Mandeep Singh, Eugene Avrutin
Summary: In this work, a nanoscale 3D hybrid plasmonic waveguide (HPWG) refractive index-cum-temperature sensor was proposed and simulated. It can be used for sensing the refractive index and temperature of aqueous analytes. Numerical simulations were performed to predict the sensitivity of the device, and the sensor was shown to be suitable for next-generation on-chip biochemical sensing applications.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Physics, Multidisciplinary
M. Mousley, G. Thirunavukkarasu, M. Babiker, J. Yuan
NEW JOURNAL OF PHYSICS
(2017)
Article
Multidisciplinary Sciences
G. Thirunavukkarasu, M. Mousley, M. Babiker, J. Yuan
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2017)
Review
Optics
Mohamed Babiker, David L. Andrews, Vassilis E. Lembessis
Article
Optics
K. Koksal, Vasileios E. Lembessis, J. Yuan, M. Babiker
Article
Optics
K. Koksal, V. E. Lembessis, J. Yuan, M. Babiker
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2020)
Article
Optics
K. Koksal, M. Babiker, V. E. Lembessis, J. Yuan
Summary: The study examines the chirality and helicity of linearly polarised Laguerre-Gaussian (LG) beams, showing that under specific conditions, these beams exhibit significant chirality and helicity density distributions. Different winding numbers result in distinct chirality and helicity distributions, with the convergence phase of the beam contributing differently to changes in these distributions at different planes along the beam propagation.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
K. Koksal, M. Babiker, V. E. Lembessis, J. Yuan
Summary: This paper systematically derives the general form of the optical helicity density for elliptically polarized waves, taking into account the contributions of the axial electric and magnetic fields. It confirms that the space integral of the term related to l in the density vanishes completely.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Stephen M. Barnett, Fiona C. Speirits, Mohamed Babiker
Summary: In summary, this paradox questions how a Gaussian beam, which has zero orbital angular momentum, can drive a quadrupole transition that requires the transfer of angular momentum to an absorbing atom.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Optics
M. Babiker, J. Yuan, V. E. Lembessis, K. Koksal
Summary: We demonstrate that uniformly linearly-polarised paraxial vortex modes carrying orbital angular momentum have zero spin angular momentum density, but exhibit non-zero helicity density distributions. This confirmed that the mode possesses chirality and can engage with chiral matter. Furthermore, it was found that the space integral of helicity and chirality densities vanish identically for all optical vortex modes carrying orbital angular momentum.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
K. Koksal, M. Babiker, V. E. Lembessis
Summary: Recent studies have shown that radially-polarised optical modes with helical wave fronts can be generated in the laboratory. These modes carry only axial optical angular momentum (AM) and have zero spin angular momentum (SAM), indicating the presence of only orbital angular momentum (OAM) and no SAM. The helicity of these modes is proportional to the winding number (l) and displays chirality. When applied to Laguerre-Gaussian (LG) modes, the total helicity is determined by the action constant (Q) multiplied by the sign of (l/|l|), and this result holds for LG modes of any magnitude of the winding number (l). The magnitude of the action constant and hence the helicity decrease for LG modes with large beam waist (w0).
Article
Optics
K. Koksal, M. Babiker, V. E. Lembessis, J. Yuan
Summary: An orthonormal set of optical vortex modes, named the polarized truncated optical Bessel (TOB) set, is proposed and identified. This set of modes possesses both orbital and spin angular momentum and can be realized by placing a circular aperture in the path of an optical Bessel beam.
Article
Optics
V. E. Lembessis, K. Koksal, J. Yuan, M. Babiker
Summary: In this study, the optical dipole potential energy of a two-level atom interacting with a circularly polarized Laguerre-Gaussian laser beam of small waist is examined. The presence of a longitudinal electric field component in the beam leads to the appearance of a chiral term in the optical dipole potential energy. A bi-chromatic vortex interaction scheme is proposed to achieve a fully chiral optical dipole potential.
Article
Optics
Smail Bougouffa, Mohamed Babiker
Article
Optics
Smail Bougouffa, Mohamed Babiker
Article
Optics
G. Thirunavukkarasu, M. Mousley, M. Babiker, J. Yuan