NRN097 - Continuous and scalable polymer capsule processing for inertial fusion energy target shell fabrication using droplet microfluidics
High specification, polymer capsules, to produce inertial fusion energy targets, were continuously fabricated using surfactant-free, inertial centralisation, and ultrafast polymerisation, in a scalable flow reactor.
NRNC05 Virtual source aperture imaging and calibration for ultrasonic inspections through dual-layered media for non-destructive testing
Insight - Non-Destructive Testing and Condition Monitoring,
Since the introduction of full matrix capture to non-destructive testing (NDT), there have been advancements in software algorithms allowing for fully-focused imagery to be generated. Due to the large number of time-domain signals associated with this approach, processing speed is often a limiting factor. This paper describes an alternative, less processor-intensive approach in which a parallel transmission of a highly divergent beam is generated to simulate a virtual point positioned some distance behind the transducer.
NRN026 - Analytical normalization of resonant states in photonic crystal slabs and periodic arrays of nanoantennas at oblique incidence
We present an analytical formulation for the normalization of resonant states at oblique incidence in one- and two-dimensional periodic structures with top and bottom boundaries to homogeneous space, such as photonic crystal slabs and arrays of nanoantennas. The normalization is validated by comparing the resonant state expansion using one and two resonant states with numerically exact results. The predicted changes of resonance frequency and linewidth due to perturbations of refractive index or geometry can be used to study resonantly enhanced refractive index sensing as well as the influence of disorder. In addition, the normalization is essential for the calculation of the Purcell factor
NRN026 - Comment on “Normalization of quasinormal modes in leaky optical cavities and plasmonic resonators”
Recently, Kristensen, Ge, and Hughes [Phys. Rev. A 92, 053810 (2015)] have compared three different methods for normalization of quasinormal modes in open optical systems and concluded that they all provide the same result. We show here that this conclusion is incorrect and illustrate that the normalization of P. T. Kristensen et al., Opt. Lett. 37, 1649 (2012), is divergent for any optical mode having a finite quality factor, and that the Silver-Müller radiation condition is not fulfilled for quasinormal modes.
NRN026 - Optimizing the Drude-Lorentz model for material permittivity: Method, program, and examples for gold, silver, and copper
Approximating the frequency dispersion of the permittivity of materials with simple analytical functions is of fundamental importance for understanding and modeling the optical response of materials and resulting structures. In the generalized Drude-Lorentz model, the permittivity is described in the complex frequency plane by a number of simple poles having complex weights, which is a physically relevant and mathematically simple approach: By construction, it respects causality, represents physical resonances of the material, and can be implemented easily in numerical simulations. We report here an efficient method of optimizing the fit of measured data with the Drude-Lorentz model having an arbitrary number of poles. We show examples of such optimizations for gold, silver, and copper, for different frequency ranges and up to four pairs of Lorentz poles taken into account. We also provide a program implementing the method for general use.
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