Infrared spectroscopy is a powerful tool widely used in research and industry for a label-free
and unambiguous identification of molecular species. Inconveniently, its application to …

Metallic structures with nanogap features have proven highly effective as building blocks for
plasmonic systems, as they can provide a wide tuning range of operating frequencies and …

Optical antennas are devices that convert freely propagating optical radiation into localized
energy, and vice versa. They enable the control and manipulation of optical fields at the …

We demonstrate Fourier transform infrared nanospectroscopy (nano-FTIR) based on a
scattering-type scanning near-field optical microscope (s-SNOM) equipped with a coherent …

Optical antennas are an emerging concept in physical optics. Similar to radiowave and
microwave antennas, their purpose is to convert the energy of free propagating radiation to …

We review the basic physics of surface-plasmon excitations occurring at metal/dielectric
interfaces with special emphasis on the possibility of using such excitations for the …

We have fabricated nanometer-scale gold dipole antennas designed to be resonant at
optical frequencies. On resonance, strong field enhancement in the antenna feed gap leads …

Infrared absorption spectroscopy enabling direct access to vibrational fingerprints of the
molecular structure is a powerful method for functional studies of bio-molecules. Although …

The plasmon resonance of metal nanoparticles can direct light from optical emitters in much
the same way that radiofrequency antennas direct the emission from electrical circuits …

Here, we report a new nanoantenna for surface-enhanced infrared absorption (SEIRA)
detection, consisting of a fan-shaped Au structure positioned at a well-specified distance …