Broadband wide-angle dispersion measurements: Instrumental setup, alignment, and pitfalls

Farhang, Arash; Abasahl, Banafsheh; Dutta-Gupta, Shourya; Lovera, Andrea; Mandracci, Pietro; Descrovi, Emiliano; Martin, Olivier J. F.

doi:10.1063/1.4795455

Cited by 6 publications

(3 citation statements)

References 44 publications

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“…The emitting beam from this slit is collected by a lens and then reflected to a camera by a reflection grating. As a result, the emitting beam of different wavelengths will be diffracted to different spatial locations on the camera 61,62 . In this configuration, the captured image can show the dispersion curves of this multilayer-chip, where the horizontal axis represents the reflected angle and the vertical axis represents the wavelength of the reflected beam, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Planar photonic chips with tailored dispersion relations for high-efficient spectrographic devices

Chen¹,

Fan

Sun

et al. 2023

Preprint

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Spectral characterizations play the important roles in both scientific research and industry. Now, there is a growing demand for spectrometers that have the merits of miniaturized size, high-efficiency, and high spectral resolution. Here, a planar photonic chip containing a photonic band gap (PBG) with tailored dispersion relations is proposed to work as a high-efficient compact spectrographic device, taking advantages of its loading Bloch surface waves (BSWs). When this chip was attached to a prism, the angular dispersion power of the low-loss BSWs enhances the spectra resolving ability of this prism without any need for inversion algorithms or physical slits, thus resulting in high efficiency in utilizing the optical signals and retrieving the spectra. The spectra of various source, such as laser, white light, fluorescence emission, and even the Raman scattering light are characterized with the compact high-efficient spectrographic devices. The achieved spectral resolution can be as high as 0.6 nm.

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Section: Resultsmentioning

confidence: 99%

Planar photonic chips with tailored dispersion relations for high-efficient spectrographic devices

Chen¹,

Fan

Sun

et al. 2023

Preprint

View full text Add to dashboard Cite

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“…A very good agreement, however, is still seen between experiment and theory in the subsequent figures, thereby demonstrating that the spectral response of the structures is very resilient to fabrication imperfections. Experimental measurements in reflection are made via the same homemade surface plasmon resonance spectrometer described in a previous work, 55 allowing for easy analysis over a wide range of incidence angles and wavelengths. The sample was attached onto the cylindrical prism of the measurement setup from the grating side via index matching gel, thus effectively providing a complete glass background.…”

Section: Methodsmentioning

confidence: 99%

Large-scale sub-100 nm compound plasmonic grating arrays to control the interaction between localized and propagating plasmons

et al. 2014

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Compound plasmonic resonances arise due to the interaction between discrete and continuous metallic nanostructures. Such combined nanostructures provide a versatility and tunability beyond that of most other metallic nanostructures. In order to observe such resonances and their tunability, multiple nanostructure arrays composed of periodic metallic gratings of varying width and an underlying metallic film should be studied. Large-area compound plasmonic structures composed of various Au grating arrays with sub-100 nm features spaced nanometers above an Au film were fabricated using extreme ultraviolet interference lithography. Reflection spectra, via both numerical simulations and experimental measurements over a wide range of incidence angles and excitation wavelengths, show the existence of not only the usual propagating and localized plasmon resonances, but also compound plasmonic resonances. These resonances exhibit not only propagative features, but also a spectral evolution with varying grating width. Additionally, a reduction of the width of the grating elements results in coupling with the localized dipolar resonance of the grating elements and thus plasmon hybridization. This newly acquired perspective on the various interactions present in such a plasmonic system will aid in an increased understanding of the mechanisms at play when designing plasmonic structures composed of both discrete and continuous elements.

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“…SP dispersion measurements (reflectivity as a function of incidence angle and wavelength) were carried out using a homemade setup described by Farhang et al 36 Briefly, a broadband halogen source is incident on a cylindrical SiO 2 prism housing the sample to excite the plasmon at the alloy− air interface using the Kretschmann configuration (Figure S10c). The reflected light intensity was collected and analyzed using a spectrometer for different angles of incidence.…”

Section: Nanofabrication Of Nanoaperturesmentioning

confidence: 99%

Microstructure Dictates the Behavior of Plasmons in Nanostructured Ag-Cu Alloy Films

et al. 2022

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Surface plasmon (SP) resonances play a vital role in the efficient control of light−matter interaction at the nanoscale beyond the diffraction limit. Alloy plasmonics has opened new avenues for composition-dependent tuning of the plasmonic response. In this study, we demonstrate that phase separation in immiscible alloy systems can be used as an additional degree of freedom in conjunction with the composition to tune the plasmon behavior. The Ag-Cu alloy system is used as a model case to demonstrate the implications of phase separation and composition on both propagating and localized SPs. We use magnetron cosputtering to deposit a metastable FCC solid solution thin film with nanocrystalline grains. Subsequent annealing of the film at 400 °C leads to phase separation and grain growth. The annealed samples exhibit Ag-rich and Cu-rich phases with composition-dependent connectivity. Dispersion of propagating SPs in thin films shows a significant dependence on the composition and annealing conditions. Annealing of the alloy films leads to a strong decrease, by a factor of up to 20%, in the resonance widths of the propagating SPs which is due to a decrease in the imaginary part of the permittivity. Nanoapertures fabricated using focused ion beam (FIB) milling show strong scattering signatures for the metastable and annealed samples. Finally, we demonstrate the site-specific fabrication of nanoapertures in the Cu or Ag domains using ionsecondary electron imaging in FIB. The proposed approach for realizing complex bimetallic nanostructures can potentially be used for realizing multiplexed metasurfaces, active plasmonic platforms, plasmon enhanced catalysis, and site-specific multianalyte sensing.

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Broadband wide-angle dispersion measurements: Instrumental setup, alignment, and pitfalls

Cited by 6 publications

References 44 publications

Planar photonic chips with tailored dispersion relations for high-efficient spectrographic devices

Planar photonic chips with tailored dispersion relations for high-efficient spectrographic devices

Large-scale sub-100 nm compound plasmonic grating arrays to control the interaction between localized and propagating plasmons

Microstructure Dictates the Behavior of Plasmons in Nanostructured Ag-Cu Alloy Films

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