Angularly tunable bandpass filter: design, fabrication, and characterization

Lumeau, Julien; Lemarchand, Fabien; Bégou, Thomas; Arhilger, Detlef; Hagedorn, Harro

doi:10.1364/ol.44.001829

Cited by 10 publications

(7 citation statements)

References 10 publications

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“…We examined several high-index materials as potential partners for the low-index material SiO 2 and ultimately chose Nb 2 O 5 . The resulting Nb 2 O 5 /SiO 2 multilayer emulates the optical constants of both calcite and vaterite CaCO 3 crystals (Figure S3) and comes with reliable fabrication (as demonstrated in other optical applications). Using plasma-assisted reactive magnetron sputtering, we are able to deposit Nb 2 O 5 /SiO 2 multilayers with precisely controlled thickness and refractive indices ( n = 1.47 for SiO 2 and n = 2.26 for Nb 2 O 5 at 1064 nm) (Methods).…”

Section: Resultsmentioning

confidence: 63%

“…This slow deposition ensures a high-quality Cr coating with low surface roughness. Then, the Nb 2 O 5 /SiO 2 multilayer is deposited using plasma-assisted reactive magnetron sputtering (HELIOS, Buḧler) 52 (Figure S8a, step 3), yielding highly reproducible refractive indices (Figure S9), while the layer thicknesses are controlled to ∼1 nm precision with the aid of in situ optical monitoring 62 (Figure S9). The multilayer stack is designed to be symmetric by starting and finishing with SiO 2 layers of the same thickness.…”

Section: Finite Element Methods Modeling Of Optical Trappingmentioning

confidence: 99%

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Versatile Multilayer Metamaterial Nanoparticles with Tailored Optical Constants for Force and Torque Transduction

Tang

Bégou

et al. 2020

ACS Nano

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The ability to apply force and torque directly to micro- and nanoscale particles in optical traps has a wide range of applications. While full control of both force and torque in three dimensions has been realized using top-down fabrication of rod-shaped particles composed of birefringent crystalline materials, widespread usage of such particles is limited as the optical constants of the predominant birefringent materials (quartz SiO2 and rutile TiO2) preclude coverage of the full application space of optical trapping. Here, we show that multilayer metamaterial nanoparticles provide access to a wide range of optical constants that can be specifically tuned for each application. Selecting the material pair Nb2O5/SiO2 from the library of amorphous dielectrics as our metamaterial, we show that its refractive index and birefringence can be designed by adapting the ratio of layer thicknesses. Using a robust top-down fabrication process, we show that uniformly sized, free-floating Nb2O5/SiO2 particles with high birefringence at moderate refractive index are obtained at high yield. Using an optical torque wrench, we show that these particles function as joint force and torque transducers while maintaining excellent stability in aqueous solutions and can be controllably optimized for particular physical characteristics such as maximal torque transfer or rapid response time. We expect that such customizable birefringent metamaterial nanoparticles whose properties surpass those of conventional crystalline particles will provide a means to unleash the full potential of optical trapping applications.

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Section: Resultsmentioning

confidence: 63%

Section: Finite Element Methods Modeling Of Optical Trappingmentioning

confidence: 99%

Versatile Multilayer Metamaterial Nanoparticles with Tailored Optical Constants for Force and Torque Transduction

Tang

Bégou

et al. 2020

ACS Nano

Self Cite

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“…The resonant frequency of the filter is strongly tunable by the twist angle, and the range of tunability is far larger compared to the line width of the resonance. The ratio of tunable frequency range to line width tends to be much higher than that for conventional Fabry–Perot filters with varying incidence angles . In practice, a finite beam size may lead to broadening of the filter line width (with more details in the Supporting Information).…”

Section: Results and Discussionmentioning

confidence: 99%

“…The ratio of tunable frequency range to line width tends to be much higher than that for conventional Fabry−Perot filters with varying incidence angles. 28 In practice, a finite beam size may lead to broadening of the filter line width (with more details in the Supporting Information).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Tunable Frequency Filter Based on Twisted Bilayer Photonic Crystal Slabs

Lou

Fan

2022

ACS Photonics

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We introduce a tunable narrow-band-stop frequency filter based on twisted bilayer photonic crystal slabs. The operation of the filter is based on the guided resonance of the slabs. We choose to operate in a regime where the operating wavelength is significantly larger than the periodicity of the individual photonic crystal slabs, such that all the resonances in the operating frequency range arise from the Moire periodicity, and hence, their resonant frequencies are strongly dependent upon the twist angle. We also show that a desired notch filter line shape can be achieved by introducing additional uniform slabs and that the filter can operate without diffraction loss and is polarization-independent. Such a filter may be potentially important for communication and signal processing applications.

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“…A bulk optical bandpass filter was used to minimize the laser cavity length. The transmission band can easily be adjusted by changing the incidence angle of the optical band pass filter 38 . We observed a stable mode-locking state with a center wavelength from 1505 to 1561 nm.…”

Section: Introductionmentioning

confidence: 99%

Full C-band wavelength-tunable, 250 MHz repetition rate mode-locked polarization-maintaining fiber laser

Jang

Park

Jin

2023

Sci Rep

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We demonstrate a full C-band wavelength-tunable mode-locked fiber laser with a repetition rate of 250 MHz, representing the highest repetition rate for C-band tunable mode-locked lasers thus far to the best of our knowledge. The polarization-maintaining fiber-based Fabry–Perot cavity enables a fundamental repetition rate of 250 MHz with a semiconductor saturable absorber mirror as a mode-locker. We observed a stable and single soliton mode-locking state with wide tunability of the center wavelength from 1505 to 1561 nm by adjusting the incident angle of a bandpass filter inside the cavity. The wavelength-tunable high-repetition-rate mode-locked laser covering the full C-band is expected to be a compelling source for many frequency-comb-based applications, including high-precision optical metrology, broadband absorption spectroscopy, and broadband optical frequency synthesizers.

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Angularly tunable bandpass filter: design, fabrication, and characterization

Cited by 10 publications

References 10 publications

Versatile Multilayer Metamaterial Nanoparticles with Tailored Optical Constants for Force and Torque Transduction

Versatile Multilayer Metamaterial Nanoparticles with Tailored Optical Constants for Force and Torque Transduction

Tunable Frequency Filter Based on Twisted Bilayer Photonic Crystal Slabs

Full C-band wavelength-tunable, 250 MHz repetition rate mode-locked polarization-maintaining fiber laser

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