Selective IR response of highly textured phase change VO<sub>2</sub> nanostructures obtained via oxidation of electron beam deposited metallic V films

Uslu, Merve Ertas; Misirlioglu, I. B.; Şendur, Kürşat

doi:10.1364/ome.8.002035

Cited by 9 publications

(4 citation statements)

References 57 publications

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“…This behaviour has been confirmed also after repeating heating-cooling cycles. This asymmetric hysteresis has been already reported in VO 2 thin films [30][31][32] and it is generally attributed either to a bimodal grain size distribution in the film or to texturing effects in the VO 2 layer. These 'defects' may freeze a residual fraction of VO 2 grains in the rutile phase well below T c , hindering, or at least slowing down, the transition back to the monoclinic phase.…”

Section: Resultssupporting

confidence: 68%

Active Modulation of Er³⁺ Emission Lifetime by VO₂ Phase‐Change Thin Films

Kalinic,

Cesca,

Lovo

et al. 2023

Advanced Photonics Research

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The active modulation of optical response of quantum emitters at the nanoscale is of paramount importance to realize tunable light sources for nanophotonic devices. Herein, a thin film of phase‐change material (VO2) is coupled to a 20 nm‐thick silica layer embedding Er3+ ions, and it is demonstrated how the active tuning of the local density of optical states near the erbium emitters provided by the thermally induced semiconductor‐to‐metal transition of VO2 can be used to dynamically control the Er3+ emission lifetime at telecom wavelength (1.54 μm). A decay rate contrast of a factor 2 is obtained between high temperature (90 °C), when VO2 is metallic, and room temperature, when VO2 is semiconductor, in agreement with calculations performed with the classical dipole oscillator analytical model. A hysteretic behavior is observed by measuring the Er3+ lifetime as a function of the temperature, whose parameters are consistent with those of grazing incidence X‐ray diffraction and optical transmittance measurements. The fractions of Er3+ ions that couple with VO2 in each phase at the different temperatures are determined by the analysis of the temporal decays. The results make the investigated system an optimal candidate for the development of tunable photon sources at telecom wavelength.

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Section: Resultssupporting

confidence: 68%

Active Modulation of Er³⁺ Emission Lifetime by VO₂ Phase‐Change Thin Films

Kalinic,

Cesca,

Lovo

et al. 2023

Advanced Photonics Research

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“…Highly textured VO 2 nanostructures, synthesized by oxidation of electron-beam deposited metallic vanadium films, exhibit selective reflectivity in the infrared [3]. A thermally tunable heterostructure incorporating a layer of VO 2 in a multilayer configuration is employed to create near-perfect infrared absorption without the need for either a Fabry-Perot cavity or nanostructuring [4].…”

Section: Summary Of Papers In the Feature Issuementioning

confidence: 99%

Feature issue introduction: Optical Phase Change Materials

Haglund¹,

Hewak²,

Ramanathan³

et al. 2018

Opt. Mater. Express

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This Optical Materials Express feature issue presents a collection of twelve papers clustered around the general topic of optical phase-change materials. While the scientific study of phase-change materials has a long history, interest in these materials for optical as well as electronic applications has risen sharply in the last decade, and is now the subject of intense worldwide research efforts. In this set of feature papers, topics range from basic materials studies to applications of phase-change materials in metasurfaces, sensing, integrated optics, silicon photonics and polarization switching.

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“…Both of these two VO 2 states greatly differ from each other in terms of electrical resistivity along with optical constants. From our previous work we know that at an operating wavelength of 1550 nm, the refractive index (RI) of VO 2 showed a shift from 3.21 + 0.17 i in the insulating phase to 2.15 + 2.79 i while in the metallic phase [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Ayaz,

Balazadeh Koucheh,

Sendur

2024

Nanomaterials

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Sensors fabricated by using a silicon-on-insulator (SOI) platform provide promising solutions to issues such as size, power consumption, wavelength-specific nature of end reflectors and difficulty to detect ternary mixture. To address these limitations, we proposed and investigated a broadband-thermally tunable vanadium dioxide (VO2)-based linear optical cavity sensor model using a finite element method. The proposed structure consists of a silicon wire waveguide on a silicon-on-insulator (SOI) platform terminated with phase-change vanadium oxide (VO2) on each side to provide light confinement. A smooth transmission modulation range of 0.8 (VO2 in the insulator state) and 0.03 (VO2 in the conductive phase state) in the 125 to 230 THz spectral region was obtained due to the of Fabry–Pérot (FP) effect. For the 3.84 μm cavity length, the presented sensor resulted in a sensitivity of 20.2 THz/RIU or 179.56 nm/RIU, which is approximately two orders of magnitude higher than its counterparts in the literature. The sensitivity of the 2D model showed direct relation with the length of the optical cavity. Moreover, the change in the resonating mode line width Δν of approximately 6.94 THz/RIU or 59.96 nm/RIU was also observed when the sensor was subjected to the change of the imaginary part k of complex refractive index (RI). This property of the sensor equips it for the sensing of aternary mixture without using any chemical surface modification. The proposed sensor haspotential applications in the areas of chemical industries, environmental monitoring and biomedical sensing.

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Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Cited by 9 publications

References 57 publications

Active Modulation of Er³⁺ Emission Lifetime by VO₂ Phase‐Change Thin Films

Active Modulation of Er³⁺ Emission Lifetime by VO₂ Phase‐Change Thin Films

Feature issue introduction: Optical Phase Change Materials

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

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Selective IR response of highly textured phase change VO2 nanostructures obtained via oxidation of electron beam deposited metallic V films

Cited by 9 publications

References 57 publications

Active Modulation of Er3+ Emission Lifetime by VO2 Phase‐Change Thin Films

Active Modulation of Er3+ Emission Lifetime by VO2 Phase‐Change Thin Films

Feature issue introduction: Optical Phase Change Materials

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Contact Info

Product

Resources

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Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Active Modulation of Er³⁺ Emission Lifetime by VO₂ Phase‐Change Thin Films

Active Modulation of Er³⁺ Emission Lifetime by VO₂ Phase‐Change Thin Films