Electro-tunable optical cavity filters in near-infrared regime

Nasir, Rida; Saleem, Muhammad Rizwan; Nisar, Asim; Rafiq, M. A.

doi:10.1016/j.ijleo.2020.165714

Optik

2021

DOI: 10.1016/j.ijleo.2020.165714

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Electro-tunable optical cavity filters in near-infrared regime

Rida Nasir

Muhammad Rizwan Saleem

Asim Nisar

et al.

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Cited by 2 publications

References 29 publications

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Tricolor narrowband planar perovskite photodetectors based on FP microcavity structure

Li,

Lu,

Dai

et al. 2023

Opt. Express

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This paper presents a novel tunable narrowband photodetector based on Ag-MgF2-Ag (metal-dielectric-metal: MDM) Fabry-Perot (FP) microcavity structure. The tunability is achieved through precise adjustment of the thickness of the metal and intermediate dielectric layers of the FP microcavity, taking into account the response spectral range of planar perovskite. After optimizing the parameters mentioned above, the prototype devices were prepared by combining the perovskite layer and MDM layer. The center wavelength of the planar detector can be tuned from 430 nm to 680 nm within the detection band of 400-800 nm, with a narrow FWHM about 30 nm and a relatively high response of 0.05 A/W @ 5 V bias voltage for 500 nm. Meanwhile the rise and fall times of the detector are 375 ms and 550 ms, respectively. The experimental results are corroborated by the theory. Our design is highly beneficial to such applications as hyperspectral photography and color-related active optical devices, which paves the way to design this kind of triple structure.

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Tricolor narrowband planar perovskite photodetectors based on FP microcavity structure

Li,

Lu,

Dai

et al. 2023

Opt. Express

View full text Add to dashboard Cite

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Optofluidic tunable filters using ionic liquid electrolyte capacitors

Zhu,

Lam,

Wang

et al. 2024

Opt. Express

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Tunable optical filter is a basic component for most optical systems. This study reports a unique design of Fabry-Pérot (FP) tunable filter by using an ionic liquid solution. The tunable filter consists of two neighboring regions: capacitor region and FP region. The former is in the form of electrolyte capacitor and the latter remains transparent as an FP cavity for light transmission. When the capacitor region is applied with a bias voltage, it attracts the ions from the FP region and thus reduces the ion concentration of the FP region, resulting in a change of the refractive index and eventually a shift of transmission peak of the FP cavity. Among four electrolyte solutions studied, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF6) exhibits the best overall performance, such as low insertion loss (3.2 dB), large side mode suppression ratio (23 dB) and high stability (drift <0.2 nm). Additionally, a wavelength tuning of 0.17 nm/V is achieved over 0–17 V, providing a tunable range of 3 nm. This device features low bias voltage, no mechanical movement, easy fabrication and seamless integration with microfluidics systems, and may find potential applications in spectral analyzers and lab-on-a-chip biosensing systems.

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Electro-tunable optical cavity filters in near-infrared regime

Cited by 2 publications

References 29 publications

Tricolor narrowband planar perovskite photodetectors based on FP microcavity structure

Tricolor narrowband planar perovskite photodetectors based on FP microcavity structure

Optofluidic tunable filters using ionic liquid electrolyte capacitors

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