Theoretical exploration of asymmetric molecular harmonic emission and attosecond pulse generation in the presence of spatially inhomogeneous plasmon-enhanced field

Molecular harmonic generation in bowtie-shaped nanostructure

“…As seen, (i) when + H 2 is injected into the gap center (z 0 = 0.0), the laser enhancement presents the symmetry in the negative-z and the positive-z. As a result, the harmonic cutoff beyond the classical value of I p + 3.17U p should be obtained [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Through our calculations, the higher pulse intensity is, the larger extension of the harmonic cutoff will be.…”

“…In 2008, Kim et al [15] first reported that the HHG can be generated and extended from the plasmon-enhanced nonhomogeneous field, which can be produced when the bow-tie metallic nanostructures is illuminated by a lowintensity laser pulse. Further, the investigations of the HHG in the nonhomogeneous field receive lots of attention due to its potential to extend the harmonic cutoff [16][17][18][19][20][21][22][23][24][25][26][27][28]. In earlier stage from 2008 to 2014, the investigations of the HHG driven by the nonhomogeneous field are focus on the atomic systems [16][17][18][19][20][21][22].…”

“…In earlier stage from 2008 to 2014, the investigations of the HHG driven by the nonhomogeneous field are focus on the atomic systems [16][17][18][19][20][21][22]. Since 2015, the extension of the HHG from molecules in the nonhomogeneous field has been reported [23][24][25][26][27][28]. But the investigations on the MHHG are only focus on the extension of the harmonic cutoff, the essential reason behind the MHHG under the nonhomogeneous fields is not discussed.…”

Laser control on molecular harmonic emission and isolated attosecond pulse generation

“…Liu et al [23] theoretically investigate the selection rules of MHHG. Yavuz et al [24] and Feng [25,26] find that the plasmonic enhancement of the MHHG is entirely possible for the molecules.…”

“…, HeH 2+ , H 2 , HeH + etc) attracts lots of attention in optical physics [1,2] and leads to many new interesting phenomena. Such as, the bond softening and hardening [3,4]; the asymmetric ionization and dissociation channels [5,6]; the charge-resonance-enhanced-ionization [7,8]; the dissociative ionization [9], the kinetic-energy spectra of the dissociation and the Coulomb explosion channels [10]; the above-threshold dissociation (ATD) and the above-threshold ionization (ATI) [11,12]; the molecular high-order harmonic generation (MHHG) [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”