Metal nano-optical antennas support localized surface plasmon resonance(SPR)

which enables localized electromagnetic field enhancements.The effects of various parameters of cross-shaped nanoantenna with a metal-insulator-metal(MIM)structure on the enhancement of localized electromagnetic fields are studied.A design scheme for a the cross-shaped nanoantenna with an adjustable operating wavelength in the range of[700

1600]nm is given.Using this scheme

design of antenna unit can be completed without the need for numerical simulation calculation.The proposed scheme is used to design a cross-shaped electromagnetic field-enhancing antenna with dual-band response at 785nm and 1064nm.The array composed of the designed antenna units exhibits high volume-averaged electromagnetic field enhancement.The design scheme can provide a reference for the design of cross-shaped electromagnetic-field-enhanced antenna

and the design results can be used as localized SPR sensing devices in applications such as spectrum detection

refractive index sensing

photothermal conversion

photovoltaic conversion

photocatalysis

and other fields.