PNPCS · Purely Nonlinear Photonic Crystals
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2009-05-01 → 2011-04-30
- Финансиране от ЕС
- 237 485 €
- Участници
- 1
- Схема
- MC-IEF
Линиите свързват координатора с партньорите.
Накратко на български
Чисто нелинейните фотонни кристали се създават чрез структуриране на свойствата на литиев ниобат чрез т.нар. периодично поляризиране. Тези устройства помагат за развитието на технологии в телекомуникациите, квантовата оптика, биологията и сензорите.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Purely Nonlinear Photonic Crystals
Project Objective: The project explored a brand new approach to photonic crystals, namely Purely Nonlinear Photonic Crystals (PNPCs), based on structured optical nonlinearities. Its main objective was to develop an integrated nonlinear nano-photonic platform on ferroelectrics of the lithium niobate crystal family and achieve with it a few basic device demonstrators. The ultimate research aim encompasses photonic devices with applications to telecom and quantum optics and potentially also biology and sensing. Project Overview: The Marie Curie fellowship allowed Katia to join the group led by Prof. Laurell at KTH, where she was trained on state-of-the nanotechnologies, established a photonic platform for LiNbO3 materials (bringing in her previous expertise from 10-years research outside Sweden) and then combined these capabilities to implement novel PNPC devices. The latter rely on a new approach to material engineering, affecting the nonlinear properties (as opposed to the refractive index) of the substrate. The key technology for achieving such a purely nonlinear structuring is known as 'periodic poling'. Main scientific achievements Technology. The technological activity of the project addressed in the first instance the challenge of controlling the periodic poling in two-dimensions, to implement non conventional (2D) lattice topologies and achieve high aspect ratios (depth over width) in the periodic patterning. To this aim Katia explored new solutions combining conventional patterning (performed with external electrodes) and chemical methods (to create in-built space charge fields in the crystals to enhance the poling spatial resolution). This allowed the reliable fabrication of 1D1 and 2D2 PNPCs with record aspect ratios (4:1000=featurewidth/depth) as well as the achievement of sub-micron patterning (Fig.2, to be published). Theory and experiments. With this technology toolbox, extended to new LiNbO3 and LiTaO3 substrates with enhanced optical performance (Mg-doped and stoichiometric), Katia implemented a few basic PNPC demonstrators, for frequency up- and down- conversion as well as cascaded conversion processes (Fig.1). Recent highlights include: the broadest bandwidth to date (180 THz) achieved in parametric generation; and he demonstration of twin-beam parametric generation, a scheme unique to 2D PNPCs.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
Photonic crystals are materials patterned with periodic dielectric structures. Since they were first proposed, in 1987, they have grown into a burgeoning research field with a rich spectrum of applications. Recent research in the field has been rapidly expanding to include nonlinear effects. Combining the compact formats and versatility of photonic crystal structures with the functionalities of optical nonlinearities could ultimately prove to be the key to tunable all-optical devices with huge impact across a broad range of disciplines, from telecommunications and quantum computing, to biology and sensing. Traditional approaches to nonlinear photonic crystals involve micro- (nano-) structuring the linear properties of a nonlinear medium. The research I wish to pursue through an IEF with the world-leading group on nanostructured ferroelectric optical materials would reverse this paradigm, to explore a brand new class of 2D periodic structures, i.e. Purely Nonlinear Photonic Crystals (PNPCs), based on micro- (nano-) structured nonlinearities. Key to the project will be the development of an integrated nonlinear nano-photonic platform in lithium niobate, a ferroelectric crystal in which the sign of the nonlinearity can be periodically modulated in space and exploited in integrated optical formats. The development of a such a nonlinear technology toolkit would enable a new class of ‘parametric’ photonic crystals which could manipulate all-optically the pathway, pulse shape, delay, spectrum and phase of multicolour light beams by means of purely nonlinear mechanisms (not via interference and diffraction as in ordinary photonic crystals). This could open a completely unexplored realm, holding promise for excitingly new physics and unprecedented possibilities for device engineering.
Оригинален текст от CORDIS (на английски).
Участници
- KUNGLIGA TEKNISKA HOEGSKOLAN · StockholmКоординаторШвеция
Връзки
Данни: CORDIS, © Европейски съюз