Some theory of a dual-polarization interferometer for sensor applications

Abram, R. A.; Brand, S.

doi:10.1088/0022-3727/48/12/125101

Cited by 5 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A dual-polarization SPTI would allow the realization of the so-called dual-polarization laser [34][35][36] with additional built-in topological protection. Furthermore, due to the significant difference between the field distributions of TE and TM polarization modes, which response differently to the environment, dual-polarization interferometry has been widely used for a broad range of applications [37][38][39], such as, bionanotechnology, surface science, liquid studies, crystallography and drug discovery. Dualpolarization is also useful to enhance nonlinear optical effects [40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Dual-Polarization Second-Order Photonic Topological Insulators

et al. 2021

View full text Add to dashboard Cite

Second-order photonic topological insulators that host highly localized corner states resilient to defects, are opening new routes towards developing fascinating photonic devices. However, the existing works on second-order photonic topological insulators have mainly focused on either transverse magnetic or transverse electric modes. In this paper, we propose a dual-polarization topological photonic crystal structure for both transverse magnetic and transverse electric modes through topology optimization. Simple tight-binding lattice models are constructed to reveal the topological features of the optimized photonic crystal structure in a transparent way. The optimized dual-polarization second-order photonic topological insulator hosts four groups of corner states with different profiles and eigenfrequencies for both the transverse magnetic and transverse electric modes. Moreover, the robustness of theses corner states against defects is explicitly demonstrated. Our results offer opportunities for developing polarization-independent topological photonic devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Dual-Polarization Second-Order Photonic Topological Insulators

et al. 2021

View full text Add to dashboard Cite

show abstract

“…DPI measures the change in effective refractive index, n , in two different polarization modes (transverse electric (TE) and transverse magnetic (TM)) caused by the adsorption of a layer on the DPI sensor surface. In particular, the magnitude of the measured TE or TM phase change is proportional to the mass of the layer and the ratio TE/TM is proportional to the refractive index n of the adlayer or inversely proportional to the birefringence . Together with the refractive index increment of d n /d c for the material under study (0.135 cm 3 g –1 for lipids), the refractive index gives the density of material in the adsorbed layer and consequently the added (dry) mass (see also Materials and Methods section).…”

Section: Resultsmentioning

confidence: 99%

“…In particular, the magnitude of the measured TE or TM phase change is proportional to the mass of the layer and the ratio TE/TM is proportional to the refractive index n of the adlayer or inversely proportional to the birefringence. 30 Together with the refractive index increment of dn/dc for the material under study (0.135 cm 3 g −1 for lipids), 19 the refractive index gives the density of material in the adsorbed layer 18 and consequently the added (dry) mass (see also Materials and Methods section). A further benefit of DPI is that it allows for the characterization of anisotropic properties of the adlayer, such as the order parameter of the lipids, as discussed in the Introduction.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Effects of Al³⁺ on Phosphocholine and Phosphoglycerol Containing Solid Supported Lipid Bilayers

et al. 2016

View full text Add to dashboard Cite

Aluminum has attracted great attention recently as it has been suggested by several studies to be associated with increased risks for Alzheimer's and Parkinson's disease. The toxicity of the trivalent ion is assumed to derive from structural changes induced in lipid bilayers upon binding, though the mechanism of this process is still not well understood. In the present study we elucidate the effect of Al(3+) on supported lipid bilayers (SLBs) using fluorescence microscopy, the quartz crystal microbalance with dissipation (QCM-D) technique, dual-polarization interferometry (DPI), and molecular dynamics (MD) simulations. Results from these techniques show that binding of Al(3+) to SLBs containing negatively charged and neutral phospholipids induces irreversible changes such as domain formation. The measured variations in SLB thickness, birefringence, and density indicate a phase transition from a disordered to a densely packed ordered phase.

show abstract

“…Moreover, a dual wavelength operation of an IO difference interferometer was used to distinguish binding of molecules from bulk changes or temperature changes [8]. Alternatively, dual polarization interferometry can be used to determine both the thickness and density (RI) of an adlayer [13,14]. Finally, we presented a theoretical description of a method called sizeselective detection which can be used to discriminate between RI changes from binding of different sized particles and bulk changes (e.g.…”

Section: Introductionmentioning

confidence: 99%

Size-selective analyte detection with a Young interferometer sensor using multiple wavelengths

Mulder¹,

Blum²,

Subramaniam³

et al. 2016

Opt. Express

View full text Add to dashboard Cite

We present a method to discriminate between analytes based on their size using multiple wavelengths in a Young interferometer. We measured the response of two wavelengths when adding 85 nm beads (representing specific binding), protein A (representing non-specific binding) and D-glucose (inducing a bulk change) to our sensor. Next, the measurements are analysed using a approach based on theoretical analysis, and a ratio-based analysis approach to discriminate between bulk changes and the binding of the different sized substances. Moreover, we were able to discriminate binding of 85 nm beads from binding of protein A (~2 nm) in a blind experiment using the ratio-based approach. This can for example be used to discriminate specific analyte binding of larger particles from nonspecific binding of smaller particles. Therefore, we believe that by adding size-selectivity we can strongly improve the performance of the Young interferometer sensor and integrated optical interferometric sensors in general. 6396-6405 (2000). 8. C. Stamm, R. Dangel, and W. Lukosz, "Biosensing with the integrated-optical difference interferometer: dualwavelength operation," Opt. Commun. 153(4-6), 347-359 (1998). 9. K. Schmitt, B. Schirmer, C. Hoffmann, A. Brandenburg, and P. Meyrueis, "Interferometric biosensor based on planar optical waveguide sensor chips for label-free detection of surface bound bioreactions," Biosens.

show abstract

Some theory of a dual-polarization interferometer for sensor applications

Cited by 5 publications

References 10 publications

Dual-Polarization Second-Order Photonic Topological Insulators

Dual-Polarization Second-Order Photonic Topological Insulators

Effects of Al³⁺ on Phosphocholine and Phosphoglycerol Containing Solid Supported Lipid Bilayers

Size-selective analyte detection with a Young interferometer sensor using multiple wavelengths

Contact Info

Product

Resources

About

Some theory of a dual-polarization interferometer for sensor applications

Cited by 5 publications

References 10 publications

Dual-Polarization Second-Order Photonic Topological Insulators

Dual-Polarization Second-Order Photonic Topological Insulators

Effects of Al3+ on Phosphocholine and Phosphoglycerol Containing Solid Supported Lipid Bilayers

Size-selective analyte detection with a Young interferometer sensor using multiple wavelengths

Contact Info

Product

Resources

About

Effects of Al³⁺ on Phosphocholine and Phosphoglycerol Containing Solid Supported Lipid Bilayers