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Short-Pulse Laser Near-Field Ablation of Solid Targets under Liquids
Published in Ion N. Mihailescu, Anna Paola Caricato, Pulsed Laser Ablation, 2018
M. Ulmeanu, P. Petkov, F. Jipa, E. Brousseau, M. N. R. Ashfold
The relentless demand for ever more complex nanopatterned surfaces and large periodic arrays, fabricated by low-cost and effective lithographic methods, has stimulated a huge upsurge in interest in near-field optics, that is, in phenomena associated with nonpropagating and highly localized electromagnetic fields and their interaction with matter. The ability to localize the optical energy to length scales smaller than the diffraction limit, defined as λ/2 (λ being the wavelength of light), has made the scanning near-field optical microscopy (SNOM) technique an attractive field for near-field optics studies. Various types of probe tips have led to the development of many types of SNOM, for example, single-mode optical fibers[1], tip–sample spacing stabilized by shear-force control [2], and modulation of the scattered electric field from the end of a sharp silicon tip [3]. The SNOM technique requires scanning of the samples, which can disturb the optical near field by multiscattering or by strong interaction between the surface and the probes, which complicates interpretation of the scanned images. Nonoptically probing near-field microscopy has been introduced in an effort to overcome this problem [4].
Near-Field Optics
Published in Toru Yoshizawa, Handbook of Optical Metrology, 2015
Wenhao Huang, Xi Li, Guoyong Zhang
In summary, near-field optics plays an active and important role in nanofabrication and nanometrology fields. It will have a brighter future with the development of novel methods and technologies, especially those for high spatial resolution, high scanning speed, and for parallel and mass production.
On the inverse scattering from anisotropic periodic layers and transmission eigenvalues
Published in Applicable Analysis, 2022
Isaac Harris, Dinh-Liem Nguyen, Jonathan Sands, Trung Truong
Motivated by applications in near field optics we consider near field measurements in our inverse problem. More precisely, we define the near field operator mapping sequence to the Rayleigh sequences of the scattered field generated by the linear combinations of the incident plane waves in (8), i.e. where is the radiating solution to (7) for . Here, we note that the Rayleigh sequences in (10) are given by the solution operator G acting on the function , which also means that the near field operator can be factorized as Now, the inverse scattering problem can be stated as follows.
Optical analysis of the dual-microcavity effect in a red light-emitting organic device
Published in Journal of Information Display, 2021
Optical phenomena in an OLED are very complicated because the device consists of a thin film stacked structure of less than one wavelength. The radiation process in the OLED consists of the propagation and evanescent modes. As shown in Figure 2, the propagation mode is further divided into the external, substrate, and waveguide modes, which are caused by an internal reflection in the thin film layers and the substrate. When the emissive dipole is close to the metal cathode, the evanescent mode such as SP coupling with the metal layer should be further considered to accurately evaluate power dissipation in the device [7]. To calculate the optical modes, it is convenient to introduce the in-plane wavevector kh, which is defined as a horizontal component of the actual wavevector k1. If we use an in-plane wavevector, these optical modes can be arranged one-dimensionally, as shown in the right graph in Figure 2. The external mode will be treated with classical ray-optics. As for the substrate mode, the wave-optics of incoherent light will be useful. The waveguide mode is strictly calculated with the electromagnetic optics of coherent light. The SP is related to near-field optics. A wide range of wavevectors in optics is deeply involved. The optical calculation was carried out using an original software program that the author developed, which adopted a traditional approach for the dipole model developed for molecular fluorescent and energy transfer near the interface based on near-field optics and wave optics [8].
Adiabatic description of superfocusing of femtosecond plasmon polaritons
Published in Journal of Modern Optics, 2018
P. A. Golovinski, E. S. Manuylovich, V. A. Astapenko
The evanescent field plays a central role in nano-optics (2). A surface wave can propagate along the interface between two media with the real part of dielectric permittivity of opposite signs. Electromagnetic field in such a wave is characterized by the fact that its strength decays along the direction perpendicular to the boundary surface when moving away from the interface into either medium. In the condensed matter literature these waves are commonly referred to as surface plasmon polaritons (SPPs). In short, a SPP is a mixture of an electromagnetic field and collective particle excitation that propagates along the surface of a medium or along the interface between two media with dielectric permittivity of opposite signs (3). In the context of near-field optics and nano-optics, the study of optical phenomena related to surface waves was termed plasmonics or nanoplasmonics (4).