We present a theoretical study of crystalline and amorphous silicon thin-film solar cells with periodic pattern on sub-micron scale realized in the layer filled dioxide right below properly designed antireflection (AR) coating.The optimization structure as function all photonic lattice parameters, together calculation absorption single layer, allows to identify different roles determining an increase absorbance.From one side, crystal AR coating act impedance matching layers, thus minimizing...

Materials of which the optical response is determined by their structure are much interest both for fundamental properties and applications. Examples range from simple gratings to photonic crystals. Obtaining control over crucial importance in this context, it often attempted electro-optical effect or using magnetic fields. In paper, we introduce use light switch tune a structured material, exploiting physical deformation induced itself. new strategy, drives an elastic reshaping, leads...

We demonstrate controlled optical critical coupling into highly confining metal-insulator-metal grating-based resonators. achieve the coupling—and hence absorption—of more than 95% of incoming photons in a gallium arsenide based system confined between metallic ground plane and grating. The demonstration is given terahertz range electromagnetic spectrum, at 75 μm ≤ λ 120 μm, for semiconductor core thickness only 10 μm. It valid, however, any wavelength, upon linear scaling. regime...

Terahertz spectroscopy is a perfect tool to investigate the electronic intraband conductivity of graphene, but phenomenological model (Drude-Smith) often needed describe disorder. By studying THz response isotropically strained polycrystalline graphene and using fully atomistic computational approach fit results, we demonstrate here connection between Drude-Smith parameters microscopic behavior. Importantly, clearly show that strain-induced changes in originate mainly from increased...

By placing a material in close vicinity of resonant optical element, its intrinsic response can be tuned, possibly to wide extent. Here, we show that graphene monolayer, spaced few tenths nanometers from split ring resonator metasurface, exhibits magneto-optical which is strongly influenced by the presence metasurface itself. This hybrid system holds promises view thin modulators, polarization rotators, and nonreciprocal devices, technologically relevant terahertz spectral range. Moreover,...

Electromagnetic fields coupled with mechanical degrees of freedom have recently shown exceptional and innovative applications, ultimately leading to mesoscopic optomechanical devices operating in the quantum regime motion. Simultaneously, micromechanical elements provided new ways enhance manipulate optical properties passive photonic elements. Following this concept, article we show how combining a chiral metasurface GaAs suspended micromembrane can offer scenarios for controlling...

We map out the band structure of a one-dimensional photonic crystal while 12-fs control pulse activates ultrastrong interaction with quantized electronic transitions in semiconductor quantum wells. Phase-locked multi-terahertz transients trace buildup large vacuum Rabi splitting and an unexpected asymmetric formation upper lower polariton bands. The pronounced flattening bands causes slow-down group velocity by one order magnitude on time scale oscillation period light.

In order to extend the Coherent Perfect Absorption (CPA) phenomenology broadband operation, interferometric control of absorption is investigated in two-port systems without port permutation symmetry. Starting from theory CPA treated within Scattering Matrix formalism, we demonstrate that for all linear with reciprocity represented by an ellipse as function relative phase and intensity two input beams, it uniquely determined device single-beam reflectance transmittance, dephasing output...

Wave refraction at an interface between different materials is a basic yet fundamental phenomenon, transversal to several scientific realms - electromagnetism, gas and fluid acoustics, solid mechanics, possibly also matter waves. Under specific circumstances, mostly enabled by structuration below the wavelength scale, i.e., through metamaterial approach, waves undergo negative refraction, eventually enabling superlensing transformation optics. However, presently known systems are symmetric,...

Tuning the phase and amplitude response of achiral chiral metasurfaces is a key operation in optical science technology, since it lies at heart devices like wavefront shapers, beam steerers, many others. The concept ion intercalation bridged from domain electrochemistry to that photonics, paving way for new class reconfigurable devices. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized online...

Analytical formulas are derived describing the coherent absorption of light from a realistic multilayer structure composed by an optically conducting surface on supporting substrate. The model predicts two fundamental results. First, regime named perfect transparency theoretically can always be reached. Second, optical conductance extrapolated experimental data even when substrate thickness is unknown. theoretical predictions experimentally verified analyzing graphene grown silicon carbide...

In this work we demonstrate the achievement of light-matter strong coupling regime between an intersubband transition and photonic bandlike mode supported by a metallic grating. Polaritonic resonances have been identified in reflectivity spectra at 10° incidence, with clear anticrossing appearing when is tuned across line. Experimental results are good agreement simulations performed scattering-matrix approach. This cavity design can be further optimized likely to open way new class...

We report on the transition from strong to weak light-matter coupling regime between an intersubband excitation and a photonic crystal resonance in nanostructured semiconductor membrane. Such is induced by varying intensity of ultrafast light pulse, which employed for pumping probing system eigenmodes. The phenomenon interpreted terms saturation due large number photoexcited electrons quantum well, as confirmed thorough analysis performed both frequency time domain.

Abstract Enhancing the resolution of 3D patterning techniques in functional soft polymers enlarges application areas responsive shape‐changing materials, for tunable nanophotonics and nanorobotics. Thanks to recent advances polymer science, palette available materials nanomanufacturing is becoming wider wider—although comprehension their polymerization process by two‐photon still incomplete. In this work, both shrinking minimal polymerizable unit a significant improvement mechanical...

Elusive features in photonic and electronic devices can be detected by means of advanced, time-domain spectroscopic techniques. In this letter we introduce a novel kind modulation spectroscopy, based on the optomechanical interaction mechanical modes. Applying technique to Si metasurface its drum-like modes, detect narrow-band quasi-Bound-State-in-the-Continuum (q-BIC) modes close normal incidence, where their measurement hindered high symmetry protection undesired background Showing...

In this article we discuss a model describing key features concerning the lineshapes and coherent absorption conditions in Fano-resonant dissipative coupled oscillators. The treats on same footing weak strong coupling regimes, includes critical concept, which is of great relevance numerous applications; addition, role asymmetry thoroughly analyzed. Due to wide generality model, can be adapted various frameworks like nanophotonics, plasmonics, optomechanics, envisage that analytical formulas...

In this article, we demonstrate that a grating fabricated through nanoscale volumetric cross-linking of liquid crystalline polymer enables remote polarization control over the diffracted channels. This functionality is consequence responsivity crystal networks upon light stimuli. Tuning photonic response device achieved thanks to both refractive index and shape change elements induced by molecular rearrangement under irradiation. particular, material anisotropy allows for nontrivial state...

This work reports a detailed study of quasi-guided mode resonances in metallodielectric photonic crystal slabs, focusing on the interaction with intersubband transition supported by multiple quantum well embedded itself. The strong light-matter coupling regime is obtained at room temperature mid-infrared spectral range, and its fingerprints are analyzed framework Fano line-shape model. We propose an estimate coefficient for arbitrarily shaped resonant cavities embedding wells supporting...

We demonstrate room-temperature strong coupling between a mid-infrared (λ = 9.9 μm) intersubband transition and the fundamental cavity mode of metal-insulator-metal resonator. Patterning resonator surface enables surface-coupling radiation introduces an energy dispersion which can be probed with angle-resolved reflectivity. In particular, polaritonic presents accessible minimum at k 0 where—potentially—polaritons accumulate. also show that it is possible to maximize photons into states...

We have developed terahertz frequency quantum cascade lasers that exploit a double-periodicity distributed feedback grating to control the emission and output beam direction independently. The spatial refractive index modulation of gratings necessary provide optical at fixed frequency, simultaneously, far-field pattern centered controlled angles, was designed through use an appropriate wavevector scattering model. Single mode (THz) angles tuned by design between 0° 50° realized, leading...

In this article we report about linear and nonlinear optical properties of intersubband cavity polariton samples, where the resonant photonic mode is a defect state in metallo-dielectric crystal slab. By tuning single geometric parameter resonator, Q-factor can reach values as large 85, with consequent cooperativity for light-matter interaction. We show that device featuring leads to sharp saturation, or even bistability, states. This dynamics occurs at crossover between weak strong coupling...

A strong trend for quantum based technologies and applications follows the avenue of combining different platforms to exploit their complementary technological functional advantages. Micro nano-mechanical devices are particularly suitable hybrid integration due easiness fabrication at multi-scales pervasive coupling with electrons photons. Here, we report on a nanomechanical platform where silicon chip is combined an aluminum nitride layer. Exploiting AlN piezoelectricity, Surface Acoustic...

Abstract Amplitude and phase are the basic properties of all wave phenomena; as far optical waves concerned, ability to act on these variables is at root a wealth switching devices. To quantify performance an device, essential aspect determine tradeoff between insertion loss amplitude or modulation depth. Here it shown that every device subject such tradeoff, intrinsically connected dielectric response materials employed inside element itself. This limit finds its roots in fundamental...