This paper has been prepared by the Symphony collaboration (University of Warsaw,
Uniwersytet Jagielloński, DESY/CNR and ICFO) on the occasion of the 25th anniversary of …

Optical modulation of high-harmonics generation in solids enables the detection of material
properties, such as the band structure, and promising new applications, such as super …

Plasmonic antennas can enhance the intensity of a nanojoule laser pulse by localizing the
electric field in their proximity. It has been proposed that the field can become strong enough …

High harmonic generation (HHG) in atomic and molecular gases builds the foundation of
attosecond science. In recent experiments HHG has been demonstrated in solids for the first …

High-order harmonic generation in solids, the nonlinear up-conversion of coherent radiation
resulting from the interaction of a strong and short laser pulse with a solid sample, has come …

We experimentally demonstrate backward emission of high-harmonics of a near-infrared
laser from MgO and Si crystals in the direction of specular reflection. We show that the …

An ultra-low pump intensity and high photon flux have been long pursuits of high harmonic
generation (HHG) in solids. However, there is lack of a criterion to identify a pristine solid …

Carrier-envelope-phase (CEP) controlled subcycle midinfrared pulses generated through
two-color filamentation have been applied for high-harmonic (HH) generation in a crystalline …

Plasmonic nanoantennas have been extensively explored to boost nonlinear optical
processes due to their capabilities to confine optical fields on the nanoscale. In harmonic …

Abstract In 1964, Professor LV Keldysh, with whom I share winning the Lomonosov Gold
Medal, published what was to become a very influential paper. In his paper, he developed …