@inproceedings{34465, author = {{laeim, Huddad and Schlickriede, Christian and Chaisakul, Papichaya and Chattham, Nattaporn and Panitchakan, Hathai and Siangchaew, Krisda and Zentgraf, Thomas and Pattanaporhratana, Apichart}}, booktitle = {{Metamaterials, Metadevices, and Metasystems 2022}}, editor = {{Engheta, Nader and Noginov, Mikhail A. and Zheludev, Nikolay I.}}, publisher = {{SPIE}}, title = {{{Design and investigation of a metalens for efficiency enhancement of laser-waveguide coupling in a limited space system}}}, doi = {{10.1117/12.2629789}}, year = {{2022}}, } @article{21631, abstract = {{Secret sharing is a well-established cryptographic primitive for storing highly sensitive information like encryption keys for encoded data. It describes the problem of splitting a secret into different shares, without revealing any information to its shareholders. Here, we demonstrate an all-optical solution for secret sharing based on metasurface holography. In our concept, metasurface holograms are used as spatially separable shares that carry encrypted messages in the form of holographic images. Two of these shares can be recombined by bringing them close together. Light passing through this stack of metasurfaces accumulates the phase shift of both holograms and optically reconstructs the secret with high fidelity. In addition, the hologram generated by each single metasurface can uniquely identify its shareholder. Furthermore, we demonstrate that the inherent translational alignment sensitivity between two stacked metasurface holograms can be used for spatial multiplexing, which can be further extended to realize optical rulers.}}, author = {{Georgi, Philip and Wei, Qunshuo and Sain, Basudeb and Schlickriede, Christian and Wang, Yongtian and Huang, Lingling and Zentgraf, Thomas}}, issn = {{2375-2548}}, journal = {{Science Advances}}, number = {{16}}, title = {{{Optical secret sharing with cascaded metasurface holography}}}, doi = {{10.1126/sciadv.abf9718}}, volume = {{7}}, year = {{2021}}, } @article{21821, abstract = {{We present a combined experimental and numerical study of the far-field emission properties of optical travelling wave antennas made from low-loss dielectric materials. The antennas considered here are composed of two simple building blocks, a director and a reflector, deposited on a glass substrate. Colloidal quantum dots placed in the feed gap between the two elements serve as internal light source. The emission profile of the antenna is mainly formed by the director while the reflector suppresses backward emission. Systematic studies of the director dimensions as well as variation of antenna material show that the effective refractive index of the director primarily governs the far-field emission pattern. Below cut off, i.e., if the director’s effective refractive index is smaller than the refractive index of the substrate, the main lobe results from leaky wave emission along the director. In contrast, if the director supports a guided mode, the emission predominately originates from the end facet of the director.}}, author = {{Leuteritz, T. and Farheen, H. and Qiao, S. and Spreyer, F. and Schlickriede, Christian and Zentgraf, Thomas and Myroshnychenko, Viktor and Förstner, Jens and Linden, S.}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_opticalantenna}}, number = {{10}}, title = {{{Dielectric travelling wave antennas for directional light emission}}}, doi = {{10.1364/oe.422984}}, volume = {{29}}, year = {{2021}}, } @article{17390, author = {{Chantakit, Teanchai and Schlickriede, Christian and Sain, Basudeb and Meyer, Fabian and Weiss, Thomas and Chattham, Nattaporn and Zentgraf, Thomas}}, issn = {{2327-9125}}, journal = {{Photonics Research}}, number = {{9}}, pages = {{1435--1440}}, publisher = {{OSA}}, title = {{{All-dielectric silicon metalens for two-dimensional particle manipulation in optical tweezers}}}, doi = {{10.1364/prj.389200}}, volume = {{8}}, year = {{2020}}, } @article{17523, abstract = {{Compact and robust cold atom sources are increasingly important for quantum research, especially for transferring cutting-edge quantum science into practical applications. In this study, we report on a novel scheme that uses a metasurface optical chip to replace the conventional bulky optical elements used to produce a cold atomic ensemble with a single incident laser beam, which is split by the metasurface into multiple beams of the desired polarization states. Atom numbers ~107 and temperatures (about 35 μK) of relevance to quantum sensing are achieved in a compact and robust fashion. Our work highlights the substantial progress toward fully integrated cold atom quantum devices by exploiting metasurface optical chips, which may have great potential in quantum sensing, quantum computing, and other areas.}}, author = {{Zhu, Lingxiao and Liu, Xuan and Sain, Basudeb and Wang, Mengyao and Schlickriede, Christian and Tang, Yutao and Deng, Junhong and Li, Kingfai and Yang, Jun and Holynski, Michael and Zhang, Shuang and Zentgraf, Thomas and Bongs, Kai and Lien, Yu-Hung and Li, Guixin}}, issn = {{2375-2548}}, journal = {{Science Advances}}, number = {{31}}, publisher = {{American Association for the Advancement of Science}}, title = {{{A dielectric metasurface optical chip for the generation of cold atoms}}}, doi = {{10.1126/sciadv.abb6667}}, volume = {{6}}, year = {{2020}}, } @article{16931, author = {{Zhou, Hongqiang and Sain, Basudeb and Wang, Yongtian and Schlickriede, Christian and Zhao, Ruizhe and Zhang, Xue and Wei, Qunshuo and Li, Xiaowei and Huang, Lingling and Zentgraf, Thomas}}, issn = {{1936-0851}}, journal = {{ACS Nano}}, number = {{5}}, pages = {{5553–5559}}, title = {{{Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography}}}, doi = {{10.1021/acsnano.9b09814}}, volume = {{14}}, year = {{2020}}, } @article{16944, author = {{Schlickriede, Christian and Kruk, Sergey S. and Wang, Lei and Sain, Basudeb and Kivshar, Yuri and Zentgraf, Thomas}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, number = {{6}}, pages = {{4370–4376}}, title = {{{Nonlinear imaging with all-dielectric metasurfaces}}}, doi = {{10.1021/acs.nanolett.0c01105}}, volume = {{20}}, year = {{2020}}, } @article{13650, abstract = {{Surfaces covered with layers of ultrathin nanoantenna structures—so called metasurfaces have recently been proven capable of completely controlling phase of light. Metalenses have emerged from the advance in the development of metasurfaces providing a new basis for recasting traditional lenses into thin, planar optical components capable of focusing light. The lens made of arrays of plasmonic gold nanorods were fabricated on a glass substrate by using electron beam lithography. A 1064 nm laser was used to create a high intensity circularly polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6 fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical rotation of birefringent nematic liquid crystal droplets trapped in the laser beam was possible through this metalens. The rotation of birefringent droplets convinced that the optical trap possesses strong enough angular momentum of light from radiation of each nanostructure acting like a local half waveplate and introducing an orientation-dependent phase to light. Here, we show the success in creating a miniaturized and robust metalens based optical tweezers system capable of rotating liquid crystals droplets to imitate an optical motor for future lab-on-a-chip applications.}}, author = {{Suwannasopon, Satayu and Meyer, Fabian and Schlickriede, Christian and Chaisakul, Papichaya and T-Thienprasert, Jiraroj and Limtrakul, Jumras and Zentgraf, Thomas and Chattham, Nattaporn}}, issn = {{2073-4352}}, journal = {{Crystals}}, number = {{10}}, pages = {{515}}, title = {{{Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors}}}, doi = {{10.3390/cryst9100515}}, volume = {{9}}, year = {{2019}}, } @article{1197, author = {{Schlickriede, Christian and Waterman, Naomi and Reineke, Bernhard and Georgi, Philip and Li, Guixin and Zhang, Shuang and Zentgraf, Thomas}}, issn = {{0935-9648}}, journal = {{Advanced Materials}}, number = {{8}}, publisher = {{Wiley-Blackwell}}, title = {{{Imaging through Nonlinear Metalens Using Second Harmonic Generation}}}, doi = {{10.1002/adma.201703843}}, volume = {{30}}, year = {{2018}}, } @article{678, author = {{Georgi, Philip and Schlickriede, Christian and Li, Guixin and Zhang, Shuang and Zentgraf, Thomas}}, issn = {{2334-2536}}, journal = {{Optica}}, number = {{8}}, publisher = {{The Optical Society}}, title = {{{Rotational Doppler shift induced by spin-orbit coupling of light at spinning metasurfaces}}}, doi = {{10.1364/optica.4.001000}}, volume = {{4}}, year = {{2017}}, } @article{680, author = {{Peter, Manuel and Hildebrandt, Andre and Schlickriede, Christian and Gharib, Kimia and Zentgraf, Thomas and Förstner, Jens and Linden, Stefan}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, keywords = {{tet_topic_opticalantenna}}, number = {{7}}, pages = {{4178--4183}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Directional Emission from Dielectric Leaky-Wave Nanoantennas}}}, doi = {{10.1021/acs.nanolett.7b00966}}, volume = {{17}}, year = {{2017}}, } @article{681, author = {{Guo, Qinghua and Schlickriede, Christian and Wang, Dongyang and Liu, Hongchao and Xiang, Yuanjiang and Zentgraf, Thomas and Zhang, Shuang}}, issn = {{1094-4087}}, journal = {{Optics Express}}, number = {{13}}, publisher = {{The Optical Society}}, title = {{{Manipulation of vector beam polarization with geometric metasurfaces}}}, doi = {{10.1364/oe.25.014300}}, volume = {{25}}, year = {{2017}}, } @article{1199, author = {{Li, Guixin and Wu, Lin and Li, King F. and Chen, Shumei and Schlickriede, Christian and Xu, Zhengji and Huang, Siya and Li, Wendi and Liu, Yanjun and Pun, Edwin Y. B. and Zentgraf, Thomas and Cheah, Kok W. and Luo, Yu and Zhang, Shuang}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, number = {{12}}, pages = {{7974--7979}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Nonlinear Metasurface for Simultaneous Control of Spin and Orbital Angular Momentum in Second Harmonic Generation}}}, doi = {{10.1021/acs.nanolett.7b04451}}, volume = {{17}}, year = {{2017}}, }