Search query: ACS Photonics 5（9），3472-3477（2018）

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abstract: Two dimensional (2D) materials such as graphene, transition metal dichalcogenides (TMDs) and hexagonal boron nitride (hBN) have attracted a large amount of interests due to their extraordinary electrical, optical, and mechanical properties comparing with their bulk counterparts. Recently, black phosphorus (BP) has emerged as a new 2D material with demonstrated high hole mobility, showing great potential in electronic applications such as field effect transistors (FETs) In this talk we will first review our recent works on the electric, photo electrical, mechanical, and thermal behaviors of few layer black phosphorus [1 4] We will then discuss the photonics applications of black phosphorus. 2D black phosphorus is an excellent candidate for use in photodetection devices due to its direct and thickness dependent bandgap [1] However, light absorptions in these 2D materials are often very low due to its ultra thin nature. For example, the visible light absorption in single layer graphene is only 2.3% Making plasmonic structures, such as nano disks and rods, on top of the 2D material can be a possible way to enhance the absorption. In our work, a new bowtie like plasmonic structure was proposed, and numerical simulations were used to design and optimize the plasmonic structures that are used to enhance both absorption and polarization selectivity in black phosphorus photodetection devices. The optimized structure devices were then fabricated on black phosphorus on transparent substrate. Photocurrent measurements showed strong light polarization dependence/selectivity in the fabricated device as well as much stronger photo responsivity compared with devices without plasmonic enhancement. Our study demonstrated the potentials of black phosphorus for photodetection and other light harvesting applications. [1] Liu, H. Neal, A. Zhu, Z. Luo, Z. Xu, X. Tomanek, D. Ye, P.D. 2014, "Phosphorene: An Unexplored 2D Semiconductor with a High Hole Mobility," ACS Nano, 8(4) pp. 4033 4041. [2] Deng, Y. Luo, Z. Conrad, N. J. Liu, H. Gon,g Y. Najmaei, S. Ajayan, P. M. Lou, J. Xu, X. and Ye, P. D. 2014, "Black Phosphorus Monolayer MoS2 van der Waals Heterojunction P N Diode." ACS Nano, 8(8) pp. 8292 8299. [3] Luo, Z. Maassen, J. Deng, Y. Du, Y. Garrelts, R. P. Lundstrom, M. S. Ye, P. D. and Xu, X. 2015, "Anisotropic in plane thermal conductivity observed in few layer black phosphorus" Nat. Commun. 6:8572, pp. 9572 1 8. [4] Du, Y. Maassen, J. Wu, W. Luo, Z. Xu, X. and Ye, P. 2016, "Auxetic Black Phosphorus: A 2D Material with Negative Poisson's Ratio" Nano Lett. DOI: 10.1021/acs.nanolett.6b03607.
author_names: Xianfan Xu
title: Black phosphorus: a novel 2D material and its photonics applications (Conference Presentation)
year: 2018

abstract: W read with great interest the article "Enantioselective Optical Trapping of Chiral Nanoparticles with Plasmonic Tweezers" by Yang Zhao and collaborators, which appeared in ACS Photonics in 2016. The authors expand the idea of chiral forces, which act differently on the enantiomers of a chiral substance, to propose an enantioselective optical trap. They theoretically analyzed such a trap based on a specifically designed plasmonic nanostructure and found that it traps only one enantiomer of a given chiral substance while repelling the other. Obviously, such a device would be highly interesting, especially for chemistry and pharmaceutics. However, we believe that there are severe difficulties for actual realizations of this effect, which we will discuss in this comment. The total trapping force acting on the molecule is given as (cf. eq 3 in ref 1)
author_names: Martin Schaferling

Harald Giessen
title: Comment on "Enantioselective Optical Trapping of Chiral Nanoparticles with Plasmonic Tweezers"
year: 2018

abstract: The potential of supramolecular transition metal coordination complexes to form robust, long living, radiative charge transfer states makes this class of triplet state emitters ideal candidates for application as photosensitizes or in photonic devices. Antenna enhanced phosphorescence experiments on single Ru2+ bis terpyridine complexes incorporated into a thin PMMA film show that phosphorescence emission spectra can exhibit shifts depending on the local environment [J. F. Herrmann, P. S. Popp, A. Winter, U. S. Schubert and C. Hoppener, ACS Photonics, 2016, 3, 1897 1906] Here, we demonstrate that the environmentally altered spectral properties of individual dual luminescent Ru2+ bis terpyridine complexes in PMMA and acetonitrile can be reproduced by DFT based vibrationally resolved Franck Condon spectra, if the phosphorescent emission of different molecular conformations is taken into account. Furthermore, we demonstrate that the triplet emission of these complexes occurs from a metal to ligand charge transfer (MLCT) state.
author_names: Tobias Koch

Christiane Hoppener

Nikos L Doltsinis
title: Conformation dependent phosphorescence emission of individual mononuclear ruthenium (ii) bis terpyridine complexes.
venue: Physical chemistry chemical physics PCCP
year: 2018

abstract: Thickness is one of the most important parameters in many applications using thin layers. This article describes determination of the thickness of boron doped nanocrystalline diamond (NCD) grown on fused silica glass. The spectroscopic measurement system has been used. A high refractive index (2.3 550 nm) was achieved for NCD films. The thickness of the NCD samples has been determined from transmission spectrum. Full Text: PDF References Z. Li, S. Butun, K. Aydin, 'Large area, lithography free super absorbers and color filters at visible frequencies using ultrathin metallic films' ACS Photonics, vol. 2.2, pp. 183 188 2015. CrossRef L. Yu, D.D. Tune, C.J. Shearer, J.G. Shapter, 'Implementation of antireflection layers for improved efficiency of carbon nanotube silicon heterojunction solar cells' Solar Energy, vol. 118, pp. 592 599, 2015. CrossRef D. Majchrowicz, Daria, et al. Nitrogen Doped Diamond Film for Optical Investigation of Hemoglobin Concentration, Materials, vol. 11.1, pp. 109, 2018. CrossRef K.L. Konnerth, F.H. Dill, 'In situ measurement of dielectric thickness during etching or developing processes' IEEE Transactions on Electron Devices, vol. 22.7, pp. 452 456, 1975. CrossRef Z.G. Hu, P. Prunici, P. Hess, K.H. Chen, 'Optical properties of nanocrystalline diamond films from mid infrared to ultraviolet using reflectometry and ellipsometry' Journal of Materials Science: Materials in Electronics, vol. 18.1, pp. 37 41, 2007. CrossRef J. Adamczewska, et al. 'Procesy technologiczne w elektronice polprzewodnikowej' WNT, Warsaw, 1980. J.P. Dilger, L. R. Fisher, D. A. Haydon, 'A critical comparison of electrical and optical methods for bilayer thickness determination' Chemistry and Physics of Lipids, vol. 30.2 3, pp. 159 176, 1982. CrossRef M, Ficek, et al, 'Optical and electrical properties of boron doped diamond thin conductive films deposited on fused silica glass substrates' Applied Surface Science, vol. 387, pp. 846 856, 2016. CrossRef R. Bogdanowicz, et al, 'Opto Electrochemical Sensing Device Based on Long Period Grating Coated with Boron Doped Diamond Thin Film' J. Opt. Soc. Korea, vol. 19, pp. 705 710, 2015. CrossRef M. Sobaszek, et al. 'Optical and electrical properties of ultrathin transparent nanocrystalline boron doped diamond electrodes' Optical Materials, vol.42, pp. 24 34, 2015. CrossRef R. Bogdanowicz, et al, 'Improved surface coverage of an optical fibre with nanocrystalline diamond by the application of dip coating seeding' Diamond and Related Materials, vol. 55, pp. 52 63, 2015. CrossRef Z.G. Hu, P. Hess, 'Optical constants and thermo optic coefficients of nanocrystalline diamond films at 30 500oC' Applied physics letters, vol. 89.8: 081906, 2006. CrossRef
author_names: Aleksandra Wieloszynska

Robert Bogdanowicz
title: Studies on optical transmittance of boron doped nanocrystalline diamond films
year: 2018

abstract: We thank you for a terrific week of nano in Boston at the fall American Chemical Society meeting! The editors of ACS Nano, our advisory board, and our authors were instrumental in putting together programs on advances in nanoscience and nanotechnology and how these are impacting other fields. We had sessions on nano in energy harvesting and storage, neuroscience, photonics, space, sustainability, three dimensional (3D) printing, tissue engineering, and more. We also had sessions, talks, and events on science communications and support for nanoscience and nanotechnology in the United States and around world, topics that are closely intertwined. One of the key takeaways is that we need to communicate what the contributions of nanoscience and nanotechnology are and will be to our colleagues, to the public, and to government leaders around the world. Since there are few devices, materials, or objects that are "purely nano" it is important for us to highlight what is "nano enabled." Nano Day is coming up on October 9 (10 9) which will be a good reminder for all of us to start and to continue this outreach. In Los Angeles, we will once again be getting together to celebrate (ironically) at 1 Pico, in Santa Monica. If you are in town, please join us. If you are elsewhere, let us know what you are doing and where you will be meeting. On December 3 of this year, we will celebrate the 15th anniversary of the signing of the U.S. Nanotechnology Research and Development Act, which put into law the National Nanotechnology Initiative (NNI) programs and activities that continue to this day and that catalyzed nanoscience and nanotechnology research around the world. Stay tuned for more on how we will recognize this anniversary.
author_names: Paul S Weiss
title: Nano in Boston and Beyond.
venue: ACS nano
year: 2018

abstract: Engineering the wavefront of light in random media allows the control of wave propagation in space and time by exploiting the spatial and spectral degrees of freedom introduced by multiple scattering (M. Mounaix et al, Phys. Rev. Lett. 116, 253901 (2016) To apply this far field control strategy and focus electromagnetic energy at the nanoscale, it is necessary to introduce scatterers that feature strongly enhanced and confined optical fields such as plasmonic nanoantennas. In particular, semi continuous gold films close to the percolation threshold feature high local field enhancements (S. Gresillon et al, Phys. Rev. Lett. 82, 4520 (1999) but also propagating surface plasmon waves that can be controlled using a spatial light modulator (P. Bondareff et al, ACS Photonics 2, 1658 (2015) In this presentation, we demonstrate how controlling the phase of an incoming pulsed laser on a chosen 10 um x 10 um area of a random plasmonic metasurface allows us to optimize the two photon luminescence (TPL) of gold at a given position of the sample. The optimized TPL intensities, that are associated with strong local field enhancements, are increased by a factor of 50 for semi continuous films that are close to percolation compared to samples far from it, demonstrating that the morphology and randomness of the plasmonic film play an essential role in the control of nonlinear luminescence. Furthermore, we show that TPL intensities can be enhanced at any position of a percolated film, opening exciting perspectives for the wavefront engineering of local field enhancements in random plasmonic metasurfaces.
author_names: Gauthier Roubaud

Pierre Bondareff

Giorgio Volpe

Sebastien Bidault

Sylvain Gigan

Samuel Gresillon
title: Local optimization of nonlinear luminescence in random gold metasurfaces by far field wavefront control (Conference Presentation)
year: 2018

abstract: Gao Xing Neng shirikonGuang Ji Ji Hui Lu noShi Xian woMu Zhi suShang deha, Duo Yang naCai Liao karanaruGuang Su Zi nohaiburitsudoJi Ji gaBi Yao to naru. koremadeuehaRong Zhao yaJie Jing Cheng Chang niyoruZhong "noHua He Wu Ban Dao Ti Guang Yuan noshirikonShang Ji Ji gaYan Jiu saretekita[1] Zhong demoWei Xiao Guang Yuan noJi Ji haZhong Yao dearuga, Cong Lai noShou Fa dehahaiburitsudoJi Ban Shang denoGuang Yuan Jia Gong gaBi Yao deari, nano rezaDeng noJi Wei Xiao Gou Zao noZuo Zhi haRong Yi dehanakatsuta. Yi Fang Zhuan Xie purintoFa [2]ha, huanderuwarusuLi woJie shi tananoGou Zao noZhuan Xie gaKe Neng deari, Duo Yang nananoGou Zao woDu Li niJia Gong Hou shirikonJi Ban Shang hehaiburitsudoJi Ji surukoto gadekiru(Tu 1) Ben Fa Biao deha, Zhuan Xie purintoFa woYong itashirikonDao Bo Lu niJie He shitaLiang Zi dotsutonanorezanoShi Xian ni tsuiteBao Gao suru. Tu 2niZuo Zhi shitaGou Zao noGai Nian Tu woShi su. InAsLiang Zi dotsu towoNei Bao shitaGaAshuotonitsukuJie Jing nanobimuGong Zhen Qi ka ranaru 2 tsunonanorezaga, U Zi noshirikonDao Bo Lu nie banetsusentoJie He shiteiru. Shi Yan deha, Hou mi 370nmnoga rasuniMai meIp maretaDao Bo Lu noZhi Shang ni 2tsunonanoGong Zhen Qi rezawoShun Ci Zhuan Xie purintoshiJi Ji shita[Tu 3(a) konoShi Liao nitsuite, Bo Chang 808nmnoparusurezaLi Qi nomotoDi Wen Xian Wei Fen Guang Fa niyoruGuang Xue Ping Jia woXing tsuta. nanoGong Zhen Qi wo sorezoreLi Qi shi, Gong Zhen Qi Zhi Shang niteQu De shitasupekutoru woTu 3(b)Shang Bu niShi su. Guan Ce shitaGong Zhen Qi pikunitsuite, Li Qi Qiang Du Yi Cun Xing woDiao betatokoro, Chu Li noJi Ji naZeng Jia to Gong Zhen Qi Xian Fu noXia Zhai Hua gaGuan Ce sare, rezaFa Zhen gaQue Ren dekita. mata, Dao Bo Lu Liang Duan nogureteinguSu Zi karano Fang She woDiao betatokoro, Gong Zhen Qi Zhi Shang deGuan Ce saretamonoto Tong Yi noBo Chang niGong Zhen Qi pikugaGuan Ce sareta[Tu 3(b)Xia Bu Zi Ran Fang Chu niYou Lai surubatsukugurandogaYi Zhi sare, Gong Zhen Qi modonomigaChuan Ban shiteirukotogaFen karu. Yi Shang yo ri, shirikonDao Bo Lu niJie He shitaLiang Zi dotsutonanorezanoDong Zuo gaQue Ren sareta. Xie Ci Ben Yan Jiu haKe Yan Fei Te Bie Tui Jin Yan Jiu (15H05700) Ke Yan Fei Bu Zhu Jin (16K06924)Ji biNEDOpuroguramuniyoriSui Xing sareta. [1] B. Jang et al. Appl. Phys. Express 9, 092102 (2016) J. Kwoen et al. The 44th International Symposium on Compound Semiconductor (2017) S. Keyvaninia et al. Opt. Express 21, 3784, (2013) D. Liang and J. E. Bowers, Nat. Photonics 4, 511 (2010) [2] J. Yoon et al. Adv. Optical Mater. 3, 1313 (2015) [3] O. Painter et al. Science 284, 1819 (1999) [4] M. Khajavikhan et al. Nature 482, 204 (2012) [5] J. Lee et al. ACS Photonics 4, 2117 (2017) Fig.2 Schematic illustration of quantum dot nanolasers evanescently coupled to a silicon waveguide. Fig 1. Schematic representation of transfer printing.
author_names: Alto Osada

Yasutomo Ota

Ryota Katsumi

Katsuyuki Watanabe

Satoshi Iwamoto

Yasuhiko Arakawa
title: Demonstration of quantum dot nanolasers coupled to a silicon waveguide by transfer printing
year: 2018

abstract: Data supporting the paper: Sun, K. Riedel, C. A. Urbani, A. Simeoni, M. Mengali, S. Zalkovskij, M. Muskens, O. L. (2018) VO 2 Thermochromic Metamaterial Based Smart Optical Solar Reflector. ACS Photonics. DOI: 10.1021/acsphotonics.8b00119
author_names: Kai Sun

Christoph A Riedel

Alessandro Urbani

Mirko Simeoni

Sandro Mengali

Maksim Zalkovskij

Brian Bilenberg

C H De Groot

Otto L Muskens
title: Dataset for VO2 thermo chromic metamaterial based smart optical solar reflector
year: 2018

abstract: Single layer metallic rings are the effective structure cell which are widely used to design single band and multiband perfect metamaterial absorbers owning to their electromagnetic resonance. However, the absorbers based on the single layer metallic rings have a common shortcoming, that is the narrow absorption bandwidth. To overcome the limitations, here we proposed a single layer, flexible and broadband terahertz metamaterial absorber, which consists of four sub cells with multiple metal rings and a metal ground plane separated by a dielectric layer. By enhancing the coupling response between adjacent metallic rings and merging the adjacent resonant peaks of multi resonators, we experimentally observed broadband characteristics at the terahertz band. The average absorption of 88% from 0.63 to 1.34 THz and the relative absorption bandwidth of 95% at the incident angle of 15o for TE polarization. Correspondingly, for TM polarization the absorption of more than 80% from 0.61 to 1.1 THz with the relative absorption bandwidth of 80% were also observed. The results went far beyond the previous single layer absorbers based on metal rings and were much better than the fractal cross structure reported recently [Kenney et al. ACS Photonics 4, 2604 (2017) We had reason to believe that the presented terahertz metamaterial absorber with broad absorption bandwidth and simple structure can find important applications in communication, stealth, energy harvesting systems and so on.Single layer metallic rings are the effective structure cell which are widely used to design single band and multiband perfect metamaterial absorbers owning to their electromagnetic resonance. However, the absorbers based on the single layer metallic rings have a common shortcoming, that is the narrow absorption bandwidth. To overcome the limitations, here we proposed a single layer, flexible and broadband terahertz metamaterial absorber, which consists of four sub cells with multiple metal rings and a metal ground plane separated by a dielectric layer. By enhancing the coupling response between adjacent metallic rings and merging the adjacent resonant peaks of multi resonators, we experimentally observed broadband characteristics at the terahertz band. The average absorption of 88% from 0.63 to 1.34 THz and the relative absorption bandwidth of 95% at the incident angle of 15o for TE polarization. Correspondingly, for TM polarization the absorption of more than 80% from 0.61 to 1.1 THz with the relative a.
author_names: Guoqing Shen

Ming Zhang

Yanping Ji

Wanxia Huang

Honglin Yu

Jianping Shi
title: Broadband terahertz metamaterial absorber based on simple multi ring structures
year: 2018

abstract: Efficient extraction of photons from quantum emitters is an important prerequisite for the use of such emitters in quantum optical applications as single photons sources or sensors. One way to achieve this is by coupling to a suited photonics structure, which guides away the emitter light. Here, we show the coupling of a single defect in hexagonal boron nitride (hBN) to a tapered optical fiber via a nanomanipulation technique [1] Defects in hBN are capable of emitting single photons at room temperature while being photostable at the same time two properties that make them ideal candidates for integration in single photon sources. The high control the manipulation technique provides avoids covering the whole nanofiber with emitters. We characterize the coupled system in terms of achievable count rates, saturation intensity, and spectral properties. Antibunching measurements are used to proof the single emitter nature of the defect. Our results pave the way for integration of single defects in hBN into photonic structure and their use as single photon sources in quantum optical applications such as quantum crypthography. [1] A W Schell et al. ACS Photonics, 4, 761 767 (2017)
author_names: Andreas W Schell

Toan Trong Tran

Hideaki Takashima

Igor Aharonovich

Shigeki Takeuchi
title: Single photon extraction from defects in hBN using a tapered fiber (Conference Presentation)
year: 2018