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Broadband achromatic polarization insensitive metalens over 950 nm bandwidth in the visible and near-infrared

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Chinese optics Letters 2022年第1期20卷 160-166页

作者： Peng Sun Mengdie Zhang Fengliang Dong Liefeng Feng Weiguo Chu Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Department of Applied PhysicsSchool of ScienceTianjin UniversityTianjin 300072China Nanofabrication Laboratory CAS Key Laboratory for Nanophotonic Materials and DevicesCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Metalenses are expected to play an increasingly important role in miniaturized and integrated optical imaging components/***,devising broadband achromatic metalenses with high focusing efficiencies is still quite *** this work,we proposed an aperture-shared partition phase cooperative manipulation approach for designing a highefficiency broadband achromatic metalens composed of two concentric *** a proof-of-concept,an achromatic polarization-independent metalens is successfully designed for the visible and near-infrared range from450 nm to 1400 nm with the focusing efficiency over 70% for the wavelength range of 600 nm to 1400 *** approach reported here provides a possibility for designing a high-performance metalens,which has great potential applications in integrated optics.

关键词： achromatic metalens efficiency broadband polarization independence

Universal frequency engineering tool for microcavity nonlinear optics:multiple selective mode splitting of whispering-gallery resonances

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Photonics Research 2020年第11期8卷 1676-1686页

作者： Xiyuan Lu Ashutosh Rao Gregory Moille Daron A.Westly Kartik Srinivasan Microsystems and Nanotechnology Division Physical Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgM aryland 20899USA Institute for Research in Electronics and Applied Physics and M aryland NanoCenter University of MarylandCollege ParkMaryland 20742USA department of Chemistry and Biochemistry University of MarylandCollege ParkMaryland 20742USA Joint Quantum Institute NIST/University of MarylandCollege ParkMaryland 20742USA

Whispering-gallery microcavities have been used to realize a variety of efficient parametric nonlinear optical processes through the enhanced light–matter interaction brought about by supporting multiple high quality factor and small modal volume *** to such studies is the ability to control the relative frequencies of the cavity modes,so that frequency matching is achieved to satisfy energy *** this is done by tailoring the resonator cross *** so modifies the frequencies of all of the cavity modes,that is,the global dispersion profile,which may be undesired,for example,in introducing competing nonlinear ***,we demonstrate a frequency engineering tool,termed multiple selective mode splitting(MSMS),that is independent of the global dispersion and instead allows targeted and independent control of the frequencies of multiple cavity *** particular,we show controllable frequency shifts up to 0.8 nm,independent control of the splitting of up to five cavity modes with optical quality factors≳10^5,and strongly suppressed frequency shifts for untargeted *** MSMS technique can be broadly applied to a wide variety of nonlinear optical processes across different material platforms and can be used to both selectively enhance processes of interest and suppress competing unwanted processes.

关键词： resonator nonlinear splitting

Formation of High Concentration Cr^4＋ Ion in a PbWO4 Single Crystal

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量子光学学报 2006年第B8期12卷 78-79页

作者： Xiqi Feng Weifeng Li Tong B. Tang The stage key laboratory of High Performance Ceramics and Supeq~ne Microstructure Shanghai Institute of CeramicsCAS Shanghai 200050 China ） department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong

Imaging and Therapeutic Applications of Optical and Thermal Response of SPION-Based Third Generation Plasmonic Nanodendrimers

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optics and Photonics Journal 2015年第7期5卷 212-226页

作者： Maryam Tajabadi Mohammad E. Khosroshahi Shahin Bonakdar Laser and Nanobiophotonics Laboratory Biomaterial Group Faculty of Biomedical Engineering Amirkabir University of Technology Tehran Iran Center for Advanced Diffusion-Wave Technologies (CADIFT) Department of Mechanical and Industrial Engineering University of Toronto Toronto Canada Pasteur Institute of Iran National Cell Bank of Iran Tehran Iran

In this study, 9 nm superparamagnetic iron oxide nanoparticles (SPION) were functionalized by polyamidoamine (PAMAM) dendrimer. Using tetracholoroauric acid (HAuCl4), magnetodendrimer (MD) samples were conjugated by gold nanoparticles (Au-NPs). Two different reducing agents, i.e. sodium borohydride and hydrazine sulfate, and pre-synthesized 10-nm Au-NP were used to evaluate the efficiency of conjugation method. The samples were characterized using X-ray diffractometry (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy and fluorescence spectroscopy. The results confirmed that Au- NPs produced by sodium borohydrate and the pre-synthesized 10-nm Au-NPs were capped by MDs whereas the Au-NP prepared by hydrazine sulfate as a reducing agent was entrapped by MDs. Optical properties of the MDs were studied by laser-induced fluorescence spectroscopy (LIF) within a wide range of visible spectrum. Also, based on the thermal analysis, all synthesized nanostructures exhibited a temperature increase using 488 nm and 514 nm wavelengths of a tunable argon laser. The new iron oxide-dendrimer-Au NPs synthesized by sodium borohydrate (IDA- NaBH4) produced the highest temperature increase at 488 nm whereas the other nanostructures particularly pure Au-NPs produced more heating effect at 514 nm. These findings suggest the potential application of these nanocomposites in the field of bioimaging, targeted drug delivery and controlled hyperthermia.

关键词： SPIONs PAMAM Dendrimer Gold Nanoparticles Fluorescence Bioimaging Therapy

Variation of Trapping Strength with Size and Number of Particles in a Single Trap

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optics and Photonics Journal 2013年第2期3卷 178-183页

作者： Jitendra Bhatt Sachin Bhatt Shaival Buch Ravindra Pratap Singh Saiyed Nisar Ali Jaaffrey Birla Institute of Technology & Science Pilani - K K Birla Goa Campus Goa India department of Physics University College of Science Mohan Lal Sukhadia University Udaipur India Indian Institute of Technology Guwahati India Theoretical Physics Division Physical Research Laboratory Ahmedabad India

Optical tweezers use the radiation pressure to trap and manipulate the microscopic particles. Using various algorithms multiple traps are being formed which can trap a number of particles simultaneously. In contrast to multiple traps, many particles can be trapped at a single trap position. It is known that when two or more particles are trapped in a single trap they align themselves in axial direction and it appears as if only one particle is trapped. We present a study of the dependence of the optical trapping force on the number of particles in a single trap using equipartition method;the study was carried out for particles of different sizes. The trapping force was first found to increase then decrease with number of particles in trap for all particle sizes. We feel that our studies will be useful in applications of optical tweezers involving trapping of multiple particles in a single trap.

关键词： Optical Tweezers Multiple Particles Trapping Strength

Nonbinary LDPC BICM for Next-Generation High-Speed Optical Transmission Systems

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中兴通讯技术：英文版 2017年第1期15卷 61-66页

作者： LIN Changyu Ivan B. Djordjevic WANG Weiming CAI Yi department of Electrical and Computer Engineering University of Arizona Tucson AZ 85721 USA ZTE Inc. 6 Huashiyuan Rd Donghu H.D.Z. Wuhan 430223 China ZTE (TX) Inc. 55 Madison Ave. Morristown NJ 07960 USA

We propose a nonbinary byte-interleaved coded-modulation scheme with inner and outer turbo-like iterative *** net coding gain is 0.6 d B higher than the state-of-the-art binary single parity check(SPC)low-density parity-check(LDPC)based turbo-product counterpart,with adjustable iterations and lower *** provide the details of Bahl-CockeJelinek-Raviv(BCJR)based inner code decoder and optimum signal constellation design(OSCD)method in this *** single-mode fiber(SMF)channel simulation is also discussed.

关键词： fiber optics and optical communications modulation forward error correction (FEC) coded modulation

Optical limiting performances of transitional metal dichalcogenides MX_(2)(M = V, Nb, Ta;X = S, Se) with ultralow initial threshold and optical limiting threshold

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Chinese optics Letters 2022年第2期20卷 131-135页

作者： Chenglu Liang Enze Wang Xian Li Jing Wang Yijun Liu Binyi Chen Hongxiang Chen Yang Liu Xiangfang Peng department of Materials Science and Engineering Fujian University of TechnologyFuzhou 350108China Center for Advanced Energy and Functional Materials Fujian University of TechnologyFuzhou 350108China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610207China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

The optical limiting performances of few-layer transitional metal dichalcogenides (TMDs) nanosheets in the VB group(VS_(2),VSe_(2),NbS_(2),NbSe_(2),TaS_(2),and TaSe_(2)) were systematically investigated for the first time,to the best of our *** was found that these TMDs nanosheets showed a normalized transmittance in the range of 20%–40%at the input energy of 1.28 GW/cm^(2).Ultralow initial threshold F_(S)(0.05–0.10 J/cm^(2)) and optical limiting threshold F_(OL)(0.82–2.23 J/cm^(2)) were achieved in the TMDs nanosheets,which surpassed most of the optical limiting *** work showed the potential of TMDs beyond MoS_(2)in optical limiting field.

关键词： optical limiting transitional metal dichalcogenide initial threshold optical limiting threshold

Separating arbitrary free-space beams with an integrated photonic processor

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Light(Science & Applications) 2022年第8期11卷 1811-1822页

作者： Maziyar Milanizadeh SeyedMohammad SeyedinNavadeh Francesco Zanetto Vittorio Grimaldi Christian De Vita Charalambos Klitis Marc Sorel Giorgio Ferrari David A.B.Miller Andrea Melloni Francesco Morichetti department of Electronics Information and BioengineeringPolitecnico di Milanovia Ponzio 34/520133MilanoItaly School of Engineering University of GlasgowGlasgowG128QQUK TeCIP Institute Scuola Superiore Sant’Anna56124PisaItaly Ginzton Laboratory Stanford UniversitySpilker BuildingStanfordCA94305USA

Free-space optics naturally offers multiple-channel communications and sensing exploitable in many applications. The different optical beams will, however, generally be overlapping at the receiver, and, especially with atmospheric turbulence or other scattering or aberrations, the arriving beam shapes may not even be known in advance. We show that such beams can be still separated in the optical domain, and simultaneously detected with negligible cross-talk, even if they share the same wavelength and polarization, and even with unknown arriving beam shapes. The kernel of the adaptive multibeam receiver presented in this work is a programmable integrated photonic processor that is coupled to free-space beams through a two-dimensional array of optical antennas. We demonstrate separation of beam pairs arriving from different directions, with overlapping spatial modes in the same direction, and even with mixing between the beams deliberately added in the path. With the circuit’s optical bandwidth of more than 40 nm, this approach offers an enabling technology for the evolution of FSO from single-beam to multibeam space-division multiplexed systems in a perturbed environment, which has been a game-changing transition in fiber-optic systems.

关键词： processor polarization scattering

Subcycle control of terahertz waveform polarization using all-optically induced transient metamaterials

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Light(Science & Applications) 2014年第1期3卷 309-313页

作者： N Kamaraju Andrea Rubano Linke Jian Surajit Saha T Venkatesan Jan Notzold R Kramer Campen Martin Wolf Tobias Kampfrath Fritz Haber Institute of the Max Planck Society 14195 BerlinGermany department of Electrical Computerand Systems EngineeringRensselaer Polytechnic InstituteTroyNY 12180USA CNR-SPIN Dipartimento di FisicaUniversita`di Napoli Federico IINapoliItaly NUSNNI-Nanocore National University of SingaporeSingapore

Coherent radiation with frequencies ranging from 0.3 to 30 THz has recently become accessible using femtosecond laser *** terahertz(THz)waves have already been applied in spectroscopy and imaging and can be manipulated using static optical elements such as lenses,polarizers and ***,ultrafast modulation of THz radiation is required as well,for instance,in short-range wireless communication or for preparing shaped THz transients for the coherent control of numerous material ***,we demonstrate an all-optically created transient metamaterial that allows us to manipulate the polarization of THz waveforms with subcycle switch-on *** polarization-modulated pulses are potentially interesting for controlling elementary motions such as the vibration of crystal lattices,the rotation of molecules and the precession of spins.

关键词： terahertz metamaterial terahertz optics terahertz polarization control