Coupling of the Tamm Plasmon to the BODIPY Fluorophore in Photonic Crystals for Nonlinear Optical Applications

Abstract

Light confinement structures offer tantalizing applications in a wide variety of areas where light–matter interactions play a crucial role. Considering optical nonlinearity, light localization in nanoscale mode volumes may trigger nonlinear optical activity even at relatively low input optical powers. Here, we demonstrate the excitation of the Tamm plasmon mode of a metal–polymer photonic crystal hybrid structure, resonantly invoking absorptive nonlinear behavior of organic BODIPY dye incorporated in the spacer layer. Third-order nonlinear optical measurements are carried out using the z-scan technique with a Q-switched Nd:YAG laser delivering 7 ns pulses at 532 nm. While the bare sample exhibits negligible optical nonlinearity, the sample in the Tamm plasmon structure showed a large nonlinear absorption coefficient of 1.2 × 106 cm/GW at 0.27 GW/cm2 peak excitation intensity. Our results demonstrate a simple and efficient method to create a nonlinear nanophotonic platform valuable for applications in all-optical information processing.

Tamm Plasmon-Mediated Tunable Absorption Switching in Atomically Precise Pt17 Nanoclusters for Nonlinear Photonic Applications

“…The decay is oscillatory toward the DBR side and exponential toward the metallic side . The inclusion of silver instead of gold as the metallic layer has resulted in better optical confinement with a large field amplitude within the structure when compared to similar polymer-based Tamm cavities reported in the past. , The strong field confinement at the spacer layer results in a better light–matter interaction that can enhance the optical nonlinearity.…”

“…45 As the incident angle increases, the Tamm mode undergoes a blue shift accompanied by a reduction in its amplitude. 46,47 Figure 5c,d depicts the experimental and theoretical angleresolved transmittance spectra of the Tamm cavity respectively. The experimental results are well correlated with the theoretical simulation which confirms the spectral quality of the fabricated structure.…”

“…At an input energy of 2.5 μJ, corresponding to an on-axis intensity of 0.069 GW/cm 2 , the z-scan traces of Pt 17 -doped Tamm cavity exhibited a reduction in transmittance at the focus, characteristic of RSA (Figure a). One can extract the nonlinear absorption coefficient (β eff ) by numerically fitting the experimental data using the following equation d I d z ′ = prefix− α 0 I 1 + I I s − β eff I 2 where d I d z ′ is the change in laser intensity along the propagation distance z ′, α 0 is the linear absorption coefficient, and I s is the saturation intensity.…”

Hydrothermally Grown VS2 Nanosheets: A Material for Optical Limiting Applications

“…σ e is almost 7 times that of σ g , which suggests that ESA can be considered as a potential mechanism of RSA in this case. 47 We then explored the optical limiting qualities of the VS 2 nanostructures by using the data obtained directly from the open aperture Z-scan results. According to Tutt and Boggess, the optimal optical limiter is very transparent at low light intensities but turns opaque at increasing intensity.…”

“…The term “excited-state absorption” is used to describe this process. The ground-state absorption cross section (σ g ) and excited-state absorption cross section (σ e ) of the system were calculated using the formulas, σ g = α N A C and σ e = 10 3 italichv β eff N A C , where α = 3.2 cm –1 is the linear absorption coefficient, h is Planck’s constant, v is the frequency, β eff = 2.7 × 10 –8 cm/W is the effective absorption coefficient, C = 7.73 μ mol/cm 3 is the concentration, and N A is Avogadro’s number. , The obtained values of σ e and σ g were 48.17 × 10 –19 and 6.87 × 10 –19 cm 2 , respectively. σ e is almost 7 times that of σ g , which suggests that ESA can be considered as a potential mechanism of RSA in this case …”