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  1. Article ; Online: Dissipative coupling in a Bragg-grating-coupled single resonator with Fano resonance for anti-PT-symmetric gyroscopes.

    De Carlo, Martino / De Leonardis, Francesco / Dell'Olio, Francesco / Ding, Yunhong / Passaro, Vittorio M N

    Optics express

    2024  Volume 32, Issue 4, Page(s) 5932–5942

    Abstract: Anti-parity-time-symmetric Hamiltonians show an enhanced sensitivity to external perturbations that can be used for high-performance angular velocity sensing. Dissipative coupling is a valuable way for realizing anti-PT-symmetric Hamiltonians with ... ...

    Abstract Anti-parity-time-symmetric Hamiltonians show an enhanced sensitivity to external perturbations that can be used for high-performance angular velocity sensing. Dissipative coupling is a valuable way for realizing anti-PT-symmetric Hamiltonians with optical resonators and is usually obtained by means of auxiliary waveguides. Here, we model and experimentally show the dissipative coupling between two counterpropagating modes of a single resonator, by means of a Bragg-grating placed in the feeding bus. The proposed solution enables the possibility of accurately designing the dissipative coupling strength in integrated non-Hermitian gyroscopes, thus providing high flexibility in the design of the proposed sensor. Moreover, we theoretically and experimentally demonstrate that the dissipative coupling between two counterpropagating modes of the same resonant cavity can give rise to an asymmetric Fano resonance.
    Language English
    Publishing date 2024-03-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.510617
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: Compact Non-Volatile Multilevel Sb$_2$Se$_3$ Electro-Optical Switching in the Mid-Infrared Group-IV-Photonics Platform

    Soref, Richard / De Leonardis, Francesco / De Carlo, Martino / Passaro, Vittorio M. N.

    2024  

    Abstract: This theoretical modeling and simulation paper presents designs and projected performances of two non-volatile, broadband, on-chip 2-by-2 electro-optical switches based upon the germanium-on-insulator (GeOI) photonic-electronic platform operating at the ... ...

    Abstract This theoretical modeling and simulation paper presents designs and projected performances of two non-volatile, broadband, on-chip 2-by-2 electro-optical switches based upon the germanium-on-insulator (GeOI) photonic-electronic platform operating at the 2.5 $\mu$m mid-infrared wavelength. These compact devices facilitate large-scale integration on a monolithic wafer where all components are made of group-IV semiconductors. The switches are the two-waveguide directional coupler (DC) and the Mach-Zehnder interferometer (MZI). A thin-film graphene Joule-effect micro-heater is assumed on the planarized GeOI device to change the phase (reversably) of DC-slot-embedded Sb$_2$Se$_3$ phase-change material (PCM) from crystalline to amorphous. The MZI has this PCM within its slotted-arm waveguides. Simulations show high-performance bistable or multi-stable cross-bar switching in both devices. The 2-by-2 DC has an active coupling length of 17 $\mu$m, 130 nm gap, and a footprint of 5 $\mu$m -by- 31 $\mu$m. The device bandwidth is 30 nm over a wavelength range where cross and bar insertion losses IL are less than 0.3 dB, and where optical crosstalk is less than -15 dB. Results for the 2-by-2 MZI show crossbar switching attained with a 7.8 $\mu$m-length Sb$_2$Se$_3$ slot and a 5 $\mu$m -by- 51 $\mu$m switch footprint. Stable, multi-level switching in both devices is attained via partial amorphization. Thermal modeling shows that careful control of the voltage-pulse amplitude V applied to graphene (rectangular pulse duration of 500 ns) can give 32 levels, for example, using V in the range from 6.18 to 7.75 Volts.
    Keywords Physics - Optics ; Physics - Applied Physics
    Subject code 621
    Publishing date 2024-01-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Non-Hermitian Sensing in Photonics and Electronics: A Review.

    De Carlo, Martino / De Leonardis, Francesco / Soref, Richard A / Colatorti, Luigi / Passaro, Vittorio M N

    Sensors (Basel, Switzerland)

    2022  Volume 22, Issue 11

    Abstract: Recently, non-Hermitian Hamiltonians have gained a lot of interest, especially in optics and electronics. In particular, the existence of real eigenvalues of non-Hermitian systems has opened a wide set of possibilities, especially, but not only, for ... ...

    Abstract Recently, non-Hermitian Hamiltonians have gained a lot of interest, especially in optics and electronics. In particular, the existence of real eigenvalues of non-Hermitian systems has opened a wide set of possibilities, especially, but not only, for sensing applications, exploiting the physics of exceptional points. In particular, the square root dependence of the eigenvalue splitting on different design parameters, exhibited by 2 × 2 non-Hermitian Hamiltonian matrices at the exceptional point, paved the way to the integration of high-performance sensors. The square root dependence of the eigenfrequencies on the design parameters is the reason for a theoretically infinite sensitivity in the proximity of the exceptional point. Recently, higher-order exceptional points have demonstrated the possibility of achieving the
    Language English
    Publishing date 2022-05-24
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s22113977
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Potentiometric Chloride Ion Biosensor for Cystic Fibrosis Diagnosis and Management: Modeling and Design.

    la Grasta, Annabella / De Carlo, Martino / Di Nisio, Attilio / Dell'Olio, Francesco / Passaro, Vittorio M N

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 5

    Abstract: The ion-sensitive field-effect transistor is a well-established electronic device typically used for pH sensing. The usability of the device for detecting other biomarkers in easily accessible biologic fluids, with dynamic range and resolution compliant ... ...

    Abstract The ion-sensitive field-effect transistor is a well-established electronic device typically used for pH sensing. The usability of the device for detecting other biomarkers in easily accessible biologic fluids, with dynamic range and resolution compliant with high-impact medical applications, is still an open research topic. Here, we report on an ion-sensitive field-effect transistor that is able to detect the presence of chloride ions in sweat with a limit-of-detection of 0.004 mol/m
    MeSH term(s) Humans ; Cystic Fibrosis ; Chlorides/chemistry ; Sweating ; Potentiometry ; Biosensing Techniques
    Chemical Substances Chlorides
    Language English
    Publishing date 2023-02-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23052491
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: On-Chip Group-IV Heisenberg-Limited Sagnac Interferometric Gyroscope at Room Temperature.

    De Leonardis, Francesco / Soref, Richard / De Carlo, Martino / Passaro, Vittorio M N

    Sensors (Basel, Switzerland)

    2020  Volume 20, Issue 12

    Abstract: A room-temperature strip-guided "manufacturable" Silicon-on-Insulator (SOI)/GeSn integrated-photonics quantum-gyroscope chip operating at 1550 nm is proposed and analysed. We demonstrate how the entangled photons generated in Si Spontaneous Four Wave ... ...

    Abstract A room-temperature strip-guided "manufacturable" Silicon-on-Insulator (SOI)/GeSn integrated-photonics quantum-gyroscope chip operating at 1550 nm is proposed and analysed. We demonstrate how the entangled photons generated in Si Spontaneous Four Wave Mixing (SFWM) can be used to improve the resolution of a Sagnac interferometric gyroscope. We propose different integrated architectures based on degenerate and non-degenerate SFWM. The chip comprises several beam splitters, two SFWM entangled photon sources, a pump filter, integrated Mach-Zehnder interferometric gyro, and an array of waveguide coupled GeSn/Ge/Si single-photon avalanche detectors. The laser pumped SWFM sources generate the signal-idler pairs, which, in turn, are used to measure the two-photon, four-photon, and higher order coincidences, resulting in an increasing of the gyro resolution by a factor of two and four, with respect to the classical approach.
    Language English
    Publishing date 2020-06-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s20123476
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Methane Gas Photonic Sensor Based on Resonant Coupled Cavities.

    Campanella, Carlo Edoardo / De Carlo, Martino / Cuccovillo, Antonello / De Leonardis, Francesco / Passaro, Vittorio M N

    Sensors (Basel, Switzerland)

    2019  Volume 19, Issue 23

    Abstract: In this paper we report methane gas photonic sensors exploiting the principle of absorption-induced redirection of light propagation in coupled resonant cavities. In particular, an example of implemented architecture consists of a Fabry-Pérot (FP) ... ...

    Abstract In this paper we report methane gas photonic sensors exploiting the principle of absorption-induced redirection of light propagation in coupled resonant cavities. In particular, an example of implemented architecture consists of a Fabry-Pérot (FP) resonator coupled to a fibre ring resonator, operating in the near IR. By changing the concentration of the methane gas in the FP region, the absorption coefficient of the FP changes. In turn, the variation of the methane gas concentration allows the redirection of the light propagation in the fibre ring resonator. Then, the methane gas concentration can be evaluated by analysing the ratio between the powers of two resonant modes, counter-propagating in the fibre ring resonator. In this way, a self-referenced read-out scheme, immune to the power fluctuations of the source, has been conceived. Moreover, a sensitivity of 0.37 ± 0.04 [dB/%], defined as the ratio between resonant modes at different outputs, in a range of methane concentration included between the 0% and 5%, has been achieved. These results allow a detection limit below the lower explosive limit (LEL) to be reached with a cost-effective sensor system.
    Language English
    Publishing date 2019-11-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s19235171
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: High-sensitivity real-splitting anti-PT-symmetric microscale optical gyroscope.

    De Carlo, Martino / De Leonardis, Francesco / Lamberti, Luciano / Passaro, Vittorio M N

    Optics letters

    2019  Volume 44, Issue 16, Page(s) 3956–3959

    Abstract: Optical gyroscopes measure the angular velocity using the Sagnac effect. However, the resonance splitting due to the Sagnac effect is directly proportional to the linear dimensions of the device. Consequently, integrated optical gyroscopes are still the ... ...

    Abstract Optical gyroscopes measure the angular velocity using the Sagnac effect. However, the resonance splitting due to the Sagnac effect is directly proportional to the linear dimensions of the device. Consequently, integrated optical gyroscopes are still the subject of research. We propose the idea and the design of an anti-parity-time (APT)-symmetric optical gyroscope exhibiting a resonance splitting independent from the dimensions of the device. With a 80  μm×40  μm footprint integrated device, we demonstrated that it is possible to achieve a resonance splitting 10
    Language English
    Publishing date 2019-08-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.44.003956
    Database MEDical Literature Analysis and Retrieval System OnLINE

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