Tuning efficiency and sensitivity of guided resonances in photonic crystals and quasi-crystals: a comparative study

Pisco, Marco; Ricciardi, Armando; Gallina, Ilaria; Castaldi, G.; Campopiano, Stefania; Cutolo, A.; Cusano, A.; Galdi, Vincenzo

doi:10.1364/oe.18.017280

Cited by 16 publications

(12 citation statements)

References 25 publications

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“…Moreover, for the QC case, the actual tiling geometry constitutes an important degree of freedom for tailoring the field distribution of the resonant modes, and thus there exist further margins of improvement for the surface sensitivity. For instance, in a recent numerical parametric study on dielectric free‐standing structures38 we showed that, for a given parameter configuration (slab thickness and refractive index, and filling factor), sensitivity enhancements up to a factor of seven could be achieved solely by changing the hole spatial arrangement from periodic (square) to aperiodic (octagonal).…”

Section: Study Of the Local Refractive Index Sensitivitymentioning

confidence: 99%

Nanostructured Metallo‐Dielectric Quasi‐Crystals: Towards Photonic‐Plasmonic Resonance Engineering

Crescitelli

Ricciardi

Consales

et al. 2012

Adv Funct Materials

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The fi rst evidence of out-of-plane resonances in hybrid metallo-dielectric quasi-crystal (QC) nanostructures composed of metal-backed aperiodically patterned low-contrast dielectric layers is reported. Via experimental measurements and full-wave numerical simulations, these resonant phenomena are characterized with specifi c reference to the Ammann-Beenker (quasiperiodic, octagonal) tiling lattice geometry and the underlying physics is investigated. In particular, it is shown that, by comparison with standard periodic structures, a moderately richer spectrum of resonant modes may be excited, due to the easier achievement of phase-matching conditions endowed by its denser Bragg spectrum. Such modes are characterized by a distinctive plasmonic or photonic behavior, discriminated by their fi eld distribution and dependence on the metal fi lm thickness. Moreover, the response is accurately predicted via computationally affordable periodic-approximantbased numerical modeling. The enhanced capability of QCs to control number, spectral position, and mode distribution of hybrid resonances may be exploited in a variety of possible applications. To assess this aspect, labelfree biosensing is studied via characterization of the surface sensitivity of the proposed structures with respect to local refractive index changes. Moreover, it is also shown that the resonance-engineering capabilities of QC nanostructures may be effectively exploited in order to enhance the absorption efficiency of thin-fi lm solar cells.

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Section: Study Of the Local Refractive Index Sensitivitymentioning

confidence: 99%

Nanostructured Metallo‐Dielectric Quasi‐Crystals: Towards Photonic‐Plasmonic Resonance Engineering

Crescitelli

Ricciardi

Consales

et al. 2012

Adv Funct Materials

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“…Next we will continue with the following two steps for improving the sensitivity of our sensor. First, well will employ a PCS with a higher sensitivity obtained with multiperiodic or aperiodic nanostructures [34,35]. Second, we will use smaller functionalized spots for higher concentration of bound biomarkers and thus larger local intensity changes.…”

Section: Resultsmentioning

confidence: 99%

Handheld imaging photonic crystal biosensor for multiplexed, label-free protein detection

Jahns¹,

Brau²,

Meyer³

et al. 2015

Biomed. Opt. Express

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We present a handheld biosensor system for the label-free and specific multiplexed detection of several biomarkers employing a spectrometer-free imaging measurement system. A photonic crystal surface functionalized with multiple specific ligands forms the optical transducer. The photonic crystal slab is fabricated on a glass substrate by replicating a periodic grating master stamp with a period of 370 nm into a photoresist via nanoimprint lithography and deposition of a 70-nm titanium dioxide layer. Capture molecules are coupled covalently and drop-wise to the photonic crystal surface. With a simple camera and imaging optics the surface-normal transmission is detected. In the transmission spectrum guided-mode resonances are observed that shift due to protein binding. This shift is observed as an intensity change in the green color channel of the camera. Non-functionalized image sections are used for continuous elimination of background drift. In a first experiment we demonstrate the specific and time-resolved detection of 90.0 nm CD40 ligand antibody, 90.0 nM EGF antibody, and 500 nM streptavidin in parallel on one sensor chip. In a second experiment, aptamers with two different spacer lengths are used as receptor. The binding kinetics with association and dissociation of 250 nM thrombin and regeneration of the sensor surface with acidic tris-HCl-buffer (pH 5.0) is presented for two measurement cycles.

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“…In fact, for this particular application, aperiodically ordered lattice geometries seem to be inherently suited in view of the variety of inequivalent defect sites that they can offer by comparison with periodic PCs. Moreover, we have shown in some preliminary studies [17] that aperiodically ordered PCs can also provide new degrees of freedom in tailoring the GRs electromagnetic field distributions, which may strongly influence the tuning and sensitivity efficiency of GR-based photonic devices, thereby opening up interesting application perspectives.…”

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confidence: 99%

“…These results, which confirm our previous numerical predictions [10,11], may open up new intriguing perspectives on the engineering of GRs. In this framework, current and future investigations are aimed at the exploitation of the above effects in tuning/sensing scenarios [17] as well as the fabrication and experimental characterization of freestanding structures. Also of great conceptual interest, to further address basic questions concerning the necessity of strict periodicity, is the experimental verification of the GR phenomenon in globally aperiodic (i.e., not periodically replicated) structures [13], for which numerical studies would be computationally unaffordable.…”

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confidence: 99%

Experimental evidence of guided-resonances in photonic crystals with aperiodically ordered supercells

Ricciardi¹,

Pisco²,

Gallina³

et al. 2010

Opt. Lett.

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We report on the first experimental evidence of guided resonances (GRs) in photonic crystal slabs based on aperiodically ordered supercells. Using Ammann-Beenker (quasiperiodic, eightfold symmetric) tiling geometry, we present our study on the fabrication, experimental characterization, and full-wave numerical simulation of two representative structures (with different filling parameters) operating at near-IR wavelengths (1300-1600 nm). Our results show a fairly good agreement between measurements and numerical predictions and pave the way for the development of new strategies (based on, e.g., the lattice symmetry breaking) for GR engineering.© [9] argued that strict periodicity is an essential requirement for the excitation of GRs. However, in some recent studies [10][11][12], we have already demonstrated by numerical analysis that GRs can be excited in PC slabs based on aperiodically ordered supercells, and we have also shown the possibility of controlling the GR excitation by introducing ad hoc point defects [12]. In spite of these first numerical results, to the best of our knowledge, the excitation of GRs in globally aperiodic photonic quasicrystals (PQC) or in PC slabs with aperiodically ordered supercells has never been experimentally observed. Starting from the periodicapproximant case, for which rigorous full-wave numerical modeling [10][11][12] is still computationally affordable, we now report the experimental evidence of GR excitation in PCs with aperiodically ordered supercells.In accordance with our previous papers [10-12], we considered a supercell based on a quasiperiodic (Ammann-Beenker, octagonal) lattice exhibiting eightfold symmetry [13] and containing 97 elements (or a fraction of them), shown in Fig. 1(a).We chose a silicon-on-insulator (SOI) wafer characterized by a top silicon layer with a nominal thickness t ¼ 220 nm, 2 μm of buried oxide, and about 750 μm of bulk silicon for the experimental realization. The PQC parameters were chosen on the basis of the design carried out in [10] but took fabrication constraints into account, e.g., leaving the buried-oxide layer underneath the guiding layer for mechanical support and making holes with a radius larger than 90 nm to guarantee that they are properly etched into the silicon slab. Based on these considerations, as a first attempt for our study, we chose a lattice constant [see Fig. 1(a)] a ¼ 300 nm and a hole radius r ¼ 95 nm, corresponding to a filling parameter r=a ¼ 0:32. Because the focus of this first study is on providing some generic experimental evidence of the GR phenomenon in PQCs, the design parameters were not optimized for a specific application.A schematic of the main steps of the fabrication process is illustrated in Fig. 1(b). The pattern was first 3946OPTICS LETTERS / Vol. 35, No. 23 /

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Tuning efficiency and sensitivity of guided resonances in photonic crystals and quasi-crystals: a comparative study

Cited by 16 publications

References 25 publications

Nanostructured Metallo‐Dielectric Quasi‐Crystals: Towards Photonic‐Plasmonic Resonance Engineering

Nanostructured Metallo‐Dielectric Quasi‐Crystals: Towards Photonic‐Plasmonic Resonance Engineering

Handheld imaging photonic crystal biosensor for multiplexed, label-free protein detection

Experimental evidence of guided-resonances in photonic crystals with aperiodically ordered supercells

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