Large-area polycrystalline $α$-MoO3 thin films for IR photonics
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Larciprete, Maria Cristina Ceneda, Daniele Yang, Chiyu Dereshgi, Sina Abedini Lupo, Federico Vittorio Casaletto, Maria Pia Macaluso, Roberto Antezza, Mauro Zhang, Zhuomin M. Centini, Marco Aydin, Koray |
| author_facet | Larciprete, Maria Cristina Ceneda, Daniele Yang, Chiyu Dereshgi, Sina Abedini Lupo, Federico Vittorio Casaletto, Maria Pia Macaluso, Roberto Antezza, Mauro Zhang, Zhuomin M. Centini, Marco Aydin, Koray |
| contents | In recent years, excitation of surface phonon polaritons (SPhPs) in van der Waals materials received wide attention from the nanophotonics community. Alpha-phase Molybdenum trioxide ($α$-MoO3), a naturally occurring biaxial hyperbolic crystal, emerged as a promising polaritonic material due to its ability to support SPhPs for three orthogonal directions at different wavelength bands (range 10-20 $μ$m). Here, we report on the fabrication and IR characterization of large-area (over 1 cm$^2$ size) $α$-MoO3 polycrystalline films deposited on fused silica substrates by pulsed laser deposition. Single alpha-phase MoO3 films exhibiting a polarization-dependent reflection peak at 1006 cm$^{-1}$ with a resonance Q-factor as high as 53 were achieved. Reflection can be tuned via changing incident polarization with a dynamic range of $Δ$R=0.3 at 45 deg. incidence angle. We also report a polarization-independent almost perfect absorption condition (R<0.01) at 972 cm$^{-1}$ which is preserved for a broad angle of incidence. The development of a low-cost polaritonic platform with high-Q resonances in the mid-infrared (mid-IR) range is crucial for a wide number of functionalities including sensors, filters, thermal emitters, and label-free biochemical sensing devices. In this framework our findings appear extremely promising for the further development of lithography-free, scalable films, for efficient and large-scale devices operating in the free space, using far-field detection setups. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_13210 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Large-area polycrystalline $α$-MoO3 thin films for IR photonics Larciprete, Maria Cristina Ceneda, Daniele Yang, Chiyu Dereshgi, Sina Abedini Lupo, Federico Vittorio Casaletto, Maria Pia Macaluso, Roberto Antezza, Mauro Zhang, Zhuomin M. Centini, Marco Aydin, Koray Optics Materials Science In recent years, excitation of surface phonon polaritons (SPhPs) in van der Waals materials received wide attention from the nanophotonics community. Alpha-phase Molybdenum trioxide ($α$-MoO3), a naturally occurring biaxial hyperbolic crystal, emerged as a promising polaritonic material due to its ability to support SPhPs for three orthogonal directions at different wavelength bands (range 10-20 $μ$m). Here, we report on the fabrication and IR characterization of large-area (over 1 cm$^2$ size) $α$-MoO3 polycrystalline films deposited on fused silica substrates by pulsed laser deposition. Single alpha-phase MoO3 films exhibiting a polarization-dependent reflection peak at 1006 cm$^{-1}$ with a resonance Q-factor as high as 53 were achieved. Reflection can be tuned via changing incident polarization with a dynamic range of $Δ$R=0.3 at 45 deg. incidence angle. We also report a polarization-independent almost perfect absorption condition (R<0.01) at 972 cm$^{-1}$ which is preserved for a broad angle of incidence. The development of a low-cost polaritonic platform with high-Q resonances in the mid-infrared (mid-IR) range is crucial for a wide number of functionalities including sensors, filters, thermal emitters, and label-free biochemical sensing devices. In this framework our findings appear extremely promising for the further development of lithography-free, scalable films, for efficient and large-scale devices operating in the free space, using far-field detection setups. |
| title | Large-area polycrystalline $α$-MoO3 thin films for IR photonics |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2309.13210 |