Spatial mapping of optical force near the hot-spot of a metal-dielectric-metal bow-tie nanoantenna at a wavelength of 1550 nm is presented. Non contact mode atomic force microscopy is used with a lock-in method to produce the map. Maxwell’s stress tensor method has also been used to simulate the force produced by the bow-tie and it agrees with the experimental data. If dual lock-in amplifiers a...

The application of compact inexpensive trace gas sensor technology to a mid-infrared nitric oxide (NO) detectoion using intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) is reported. A minimum detection limit of 4.8 ppbv within a 30 ms integration time was demonstrated by using a room-temperature, continuous-wave, distributed-feedback quantum cascade laser (QCL) emitting at 5.263...

Introduction Various coil geometries have been proposed as transceiver elements in volume coil arrays for parallel excitation (PEX) and reception. Among them are TEM resonators [1], shielded surface coils [2], current sheet antennas (CSA) [3] and ReCav [4] structures. We compare these well known geometries with a printed bow-tie structure which is frequently used in antenna engineering because ...

The fundamental question of the lower bound on the radiation Q of an electrically small antenna is of practical importance because of its relationship to the antenna bandwidth. Previous works predict a lower bound on the radiation Q that is usually too low and, hence, a bandwidth that can be optimistically large. This paper addresses why this is so and offers a new prediction for a realizable l...

Background: In veterinary practice, cutaneous injuries are a very common occurrence. Various methods have been employed to close large skin defects like graft or flap often associated with relatively more complex surgical procedures. Use of tension relieving suture techniques spider plasty and bow tie technique allow the mobilization adjacent local tissue cover which was thus utilised in study....

In the emerging field of thermoplasmonics, Joule heating associated with optically resonant plasmonic structures is exploited to generate nanoscale thermal hotspots. In the present study, new methods for designing and thermally probing thermoplasmonic structures are reported. A general design rationale, based on Babinet's principle, is developed for understanding how the complementary version o...