Active Photonic Platforms X最新文献_第5页

Non-reciprocal photonics (Conference Presentation) 非互易光子学(会议报告)

Active Photonic Platforms X Pub Date : 2018-09-17 DOI: 10.1117/12.2320160

A. Alú, D. Sounas, S. Mann

引用次数: 0

The role of a discontinuous free-electron density in harmonic generation from metal surfaces and metal/oxide boundaries (Conference Presentation) 不连续自由电子密度在金属表面和金属/氧化物边界产生谐波中的作用(会议报告)

Active Photonic Platforms X Pub Date : 2018-09-17 DOI: 10.1117/12.2320704

M. Scalora, C. Cojocaru, J. Trull, M. A. Vincenti, D. Ceglia, M. Bloemer, N. Akozbek, J. Haus, R. Vilaseca, C. Angelis

{"title":"The role of a discontinuous free-electron density in harmonic generation from metal surfaces and metal/oxide boundaries (Conference Presentation)","authors":"M. Scalora, C. Cojocaru, J. Trull, M. A. Vincenti, D. Ceglia, M. Bloemer, N. Akozbek, J. Haus, R. Vilaseca, C. Angelis","doi":"10.1117/12.2320704","DOIUrl":"https://doi.org/10.1117/12.2320704","url":null,"abstract":"We discuss a dynamical model of harmonic generation that arises from surfaces that demarcate two different metals or conductors, or the electron cloud that spills outside a simple metal surface and the interior bulk, having different electron densities, for example a noble metal such as gold, and indium tin oxide (ITO). While in general two adjacent materials may contain free and bound charges that determine their respective dielectric constants, the transition region may be characterized by a large discontinuity in the free electron density, , epsilon-near-zero conditions, or multiple, nested plasmonic resonances. For example, , while the free-electron cloud that spills outside a noble metal surface decreases as a function of position from the hard ionic surface. These discrepancies lead to the prediction that the angular dependence of second harmonic generation (SHG) from a simple planar structure is direction-dependent, and highlights the sensitivity of both SHG and third harmonic generation to the makeup of the surface and what surrounds it. Our calculations also suggest that the nonlinear optical analysis of more complicated, hybrid structures, such as metal/oxide nanoantennas or metasurfaces, should always be performed by including effects that are generally overlooked, such as nonlocal effects (viscosity and pressure); the presence of linear and nonlinear quantum tunneling currents in the nano- and sub nano-gaps between the nanoantenna and embedded nanoparticles; linear and nonlinear contributions of bound (inner-core) electrons to the dielectric constant.","PeriodicalId":346327,"journal":{"name":"Active Photonic Platforms X","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114623428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental demonstration of Purcell effect in silicon Mie-resonators with embedded Ge(Si) quantum dots (Conference Presentation) 嵌入Ge(Si)量子点的硅密谐振腔Purcell效应的实验演示(会议报告)

Active Photonic Platforms X Pub Date : 2018-09-17 DOI: 10.1117/12.2320056

V. Rutckaia, J. Schilling, V. Talalaev, F. Heyroth, A. Novikov, M. Shaleev, M. Petrov, I. Staude

{"title":"Experimental demonstration of Purcell effect in silicon Mie-resonators with embedded Ge(Si) quantum dots (Conference Presentation)","authors":"V. Rutckaia, J. Schilling, V. Talalaev, F. Heyroth, A. Novikov, M. Shaleev, M. Petrov, I. Staude","doi":"10.1117/12.2320056","DOIUrl":"https://doi.org/10.1117/12.2320056","url":null,"abstract":"CMOS-compatible light emitters are intensely investigated for integrated active silicon photonic circuits. One of the approaches to achieve on-chip light emitters is the epitaxial growth of Ge(Si) QDs on silicon. Their broad emission in the 1.3-1.5 um range is attractive for the telecom applications.\u0000We investigate optical properties of Ge(Si) QD multilayers, which are grown in a thin Si slab on an SOI wafer, by steady-state and time-resolved micro-photoluminescence. We identify Auger recombination as the governing mechanism of carrier dynamics in such heterostructures.\u0000Then we demonstrate the possibility of light manipulation at the nanoscale by resonant nanostructures investigating Si nanodisks with embedded Ge(Si) QDs. We show that the Mie resonances of the disks govern the enhancement of the photoluminescent signal from the embedded QDs due to a good spatial overlap of the emitter position with the electric field of Mie modes. Furthermore, we engineer collective Mie-resonances in a nanodisk trimer resulting in an increased Q-factor and an up to 10-fold enhancement of the luminescent signal due to the excitation of anti-symmetric magnetic and electric dipole modes.\u0000Using time-resolved measurements we show that the minima of the radiative lifetime coincide with the positions of the Mie resonances for a large variation of disk sizes confirming the impact of the Purcell effect on QD emission rate. Purcell factors at the different Mie-resonances are determined.","PeriodicalId":346327,"journal":{"name":"Active Photonic Platforms X","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123463877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear optics at exceptional point (Conference Presentation) 特殊点的非线性光学(会议报告)

Active Photonic Platforms X Pub Date : 2018-09-17 DOI: 10.1117/12.2318571

Alejandro W. Rodriguez

引用次数: 0

Reconfigurable beam steering metasurface at telecommunication wavelengths (Conference Presentation) 电信波长可重构波束导向超表面(会议报告)

Active Photonic Platforms X Pub Date : 2018-09-17 DOI: 10.1117/12.2320835

Ghazaleh Kafaie Shirmanesh, R. Sokhoyan, P. Wu, H. Atwater

引用次数: 0

Manipulation and measurement of optical coherence in PT photonic structures (Conference Presentation) PT光子结构中光相干性的处理和测量(会议报告)

Active Photonic Platforms X Pub Date : 2018-09-17 DOI: 10.1117/12.2320395

Kai Wang, S. Suchkov, James G. Titchener, S. Weimann, D. Christodoulides, A. Szameit, A. Sukhorukov

{"title":"Manipulation and measurement of optical coherence in PT photonic structures (Conference Presentation)","authors":"Kai Wang, S. Suchkov, James G. Titchener, S. Weimann, D. Christodoulides, A. Szameit, A. Sukhorukov","doi":"10.1117/12.2320395","DOIUrl":"https://doi.org/10.1117/12.2320395","url":null,"abstract":"Optical coherence is of fundamental importance for both classical and quantum applications. This motivates the development of approaches for increasing the degree of coherence, which can be quantified by a measure of purity. The purity is preserved in linear conservative systems, and accordingly the manipulation of coherence was realized with specially introduced loss in bulk optical setups or diffraction on metal films involving optical absorption and plasmon coupling. Here we suggest and show experimentally for the first time that manipulation and measurement of optical coherence and state purification can be efficiently realized in integrated non-Hermitian parity-time (PT) symmetric photonic structures composed of elements with different loss or gain. Specifically, we design and fabricate laser-written waveguide directional couplers that contain two sections. The first section realizes a PT-like coupler, where one of the two waveguides features extra radiative losses via modulation. The second section consists of straight coupled waveguides with specially detuned propagation constants, which are optimized to enable a full reconstruction of the purity and optical coherence by measuring the interference pattern in both waveguides through fluorescence imaging. In PT symmetric regime, we observe that the purity of an initially fully incoherent (mixed) state is increased followed by a revival of the input state. This constitutes an important experimental evidence of reversible manipulation of light coherence in PT coupled waveguides. We anticipate that this method can facilitate a wide range of applications from classical to quantum optics, including filtering out noise and optimizing the visibility of interferometric measurements.","PeriodicalId":346327,"journal":{"name":"Active Photonic Platforms X","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128477492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0