We employed the contact forces induced by a near-field tip to tune and probe the optical resonances of a mechanically compliant photonic crystal molecule. Here, the pressure induced by the near-field tip is exploited to control the spectral proprieties of the coupled cavities in an ultrawide spectral range, demonstrating a reversible mode shift of 37.5 nm. Besides, by monitoring the coupling strength variation due to the vertical nanodeformation of the dielectric structure, distinct tip-sample interaction regimes have been unambiguously reconstructed with a nano-Newton sensitivity. These results demonstrate an optical method for mapping mechanical forces at the nanoscale with a lateral spatial resolution below 100 nm.
Nanoscale mechanical actuation and near-field read-out of photonic crystal molecules / Petruzzella, M.; La China, F.; Intonti, F.; Caselli, N.; De Pas, M.; Van Otten, F.W.M.; Gurioli, M.; Fiore, A.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - STAMPA. - 94:(2016), pp. 115413-1-115413-6. [10.1103/PhysRevB.94.115413]
Nanoscale mechanical actuation and near-field read-out of photonic crystal molecules
LA CHINA, FEDERICO;INTONTI, FRANCESCA;CASELLI, NICCOLO';DE PAS, MARCO;GURIOLI, MASSIMO;
2016
Abstract
We employed the contact forces induced by a near-field tip to tune and probe the optical resonances of a mechanically compliant photonic crystal molecule. Here, the pressure induced by the near-field tip is exploited to control the spectral proprieties of the coupled cavities in an ultrawide spectral range, demonstrating a reversible mode shift of 37.5 nm. Besides, by monitoring the coupling strength variation due to the vertical nanodeformation of the dielectric structure, distinct tip-sample interaction regimes have been unambiguously reconstructed with a nano-Newton sensitivity. These results demonstrate an optical method for mapping mechanical forces at the nanoscale with a lateral spatial resolution below 100 nm.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.