Active Plasmonics
Anatoly V Zayats
Department of Physics, King’s College London
London, WC2R 2LS, United Kingdom
anatoly.zayats@kcl.ac.uk
Strong light-matter intercations can be realised in plasmonic nanostructures openning up opportunities to control electromagnetic signals on subwavelength scales. In this talk we will discuss various plasmonic and metamaterial-based approaches for achieving active nanophotonic functionalities. All-optical and electro-optical effects as well polarisation and dispersion management with plasmonic nanostructures and their sensing applications will be overviewed.
Subwavelength waveguide devices for Near and MidInfrared applications
Alejandro ORTEGA-MOÑUX, Robert HALIR, J. Darío SARMIENTO-MERENGUEL, Alejandro SÁNCHEZ-POSTIGO, José M. LUQUE-GONZÁLEZ,
J. Gonzalo WANGÜEMERT-PÉREZ, Jens SCHMID, Dan-Xia XU, Siegfried JANZ, Jean LAPOINTE, Jordi SOLER-PENADES, Milos NEDELJKOVIC, Goran Z. MASHANOVICH, Carlos ALONSO-RAMOS, Diego PÉREZ-GALACHO, Daniel BENEDIKOVIC, Jiří ČTYROKÝ, Íñigo MOLINA-FERNÁNDEZ
and Pavel CHEBEN
Universidad de Málaga, ETSI Telecomunicación, Campus de Teatinos s/n, 29071 Málaga, Spain
National Research Council of Canada, Ottawa, Ontario K1A0R6, Canada Optoelectronics Research Centre, University of Southampton, SO17 1BJ, United Kingdom
Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay cedex, France
Institute of Photonics and Electronics AS CR, v.v.i., Chaberska 57, 18251 Prague 8, Czech Republic
aom@ic.uma.es
Subwavelength gratings (SWGs) are periodic structures with a pitch (Λ) smaller than half the wavelength of the propagating wave (λm), so diffraction effects are suppressed. S WGs behave as artificial birefringent metamaterials with optical properties which depend on the geometry of the structure [1, 2]. They have found a myriad of applications in the field of integrated optics [3], most of them implemented in the silicon-on-insulator platform (SOI). Refractive index engineering based on SWGs has contributed to significant improvements in the performance of fiber-to-chip couplers, which is known as one of the major challenges in integrated optics. The same technique has been applied to design low loss waveguide crossings, integrated planar lens and evanescent field sensors. A refinement of the design technique enables engineering not only the refractive index, but also the dispersion profile of the SWG structure, thus paving the way toward ultra-broadband integrated optical components, such as directional couplers or multimode interference (MMI) devices.
Ultra-broadband Silicon Photonic Multimode Interference Coupler
Robert HALIR, Pavel CHEBEN, Jose M. LUQUE-GONZÁLEZ, Jose D. SARMIENTOMERENGUEL, Jens H. SCHMID, Gonzalo Wangüemert-Pérez, Dan-Xia XU, Shurui WANG, Alejandro ORTEGA-MOÑUX, and Íñigo MOLINA-FERNÁNDEZ
Universidad de Málaga, ETSI Telecomunicación, Campus de Teatinos s/n, 29071 Málaga, Spain
National Research Council of Canada, Ottawa, Ontario K1A0R6, Canada robert.halir@ic.uma.es
In integrated optics, multimode interference couplers (MMIs) are used as light-wave splitters and combiners in a wide variety of devices ranging from spectrometers to sensors and coherent optical receivers. While their design and operation is generally well understood [1], the operational bandwidth remains limited. Here we present a sub-wavelength structured MMI, shown in Fig. 1(a), that overcomes this limitation and experimentally demonstrate a bandwidth exceeding 300nm at telecom wavelength, with more than 500nm bandwidth potentially attainable (as per 3D-FDTD simulations).
Fully suspended slot waveguide racetrack resonators
Wen Zhou, Zhenzhou Cheng, Yun Gao, Xinru Wu, Xiankai Sun, Hon Ki Tsang Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong
Department of Chemistry, The University of Tokyo, Tokyo, 113-0033, Japan wzhou@ee.cuhk.edu.hk
A fully suspended slot waveguide (FSSW) racetrack resonator is experimentally demonstrated for the first time . The suspended slotted waveguide core is mechanically supported by lateral subwavelength grating (SWG) bridges. The measured loaded optical Q factor is 1650 at a resonant wavelength of 2326.20 nm, with extinction ratio of 18.1 dB . Optical slot waveguides fabricated on the silicon-on-insulator (SOI) platform enables direct light–matter interaction . Its ring resonators are promising for trace-gas sensing, microparticle trapping, and nano-optomechanical mass and displacement measurements. To date, slot ring/racetrack structures on buried oxide (BOX) have been adopted in the above applications. However, their operation wavelength is limited below 4.0 μm in the mid-infrared (MIR) regime due to the strong absorption of BOX.