Abstract
Abstract Metasurfaces composed of regularly arranged and deliberately oriented metallic nanoparticles can be employed to manipulate the amplitude, phase and polarization of an incident electromagnetic wave. The metasurfaces operating in the visible to near infrared spectral range rely on the modern fabrication technologies which offer a spatial resolution beyond the optical diffraction limit. Although direct laser writing is an alternative to the fabrication of nanostructures, the achievement of regular nanostructures with deep-subwavelength periods by using this method remains a big challenge. Here, we proposed and demonstrated a novel strategy for regulating disordered plasmonic nanoparticles into nanogratings with deep-subwavelength periods and reshaped nanoparticles by using femtosecond laser pulses. The orientations of the nanogratings depend strongly on the polarization of the femtosecond laser light. Such nanogratings exhibit reflection and polarization control over the reflected light, enabling the realization of polarization sensitive optical memory and color display with high spatial resolution and good chromacity.
Highlights
Wavelength and polarization are two important parameters that characterize the physical properties of an electromagnetic wave or light
We showed that the nanogratings exhibit polarization control over the reflected light, which implying potential applications in high-density optical memory and polarization sensitive optical display
3.1 Nanogratings induced by femtosecond laser pulses
Summary
Wavelength and polarization are two important parameters that characterize the physical properties of an electromagnetic wave or light. LIPSSs look like gratings and may exhibit structural colors [5,6,7] They are usually classified into low-frequency LIPSSs with a period close to the wavelength of the irradiated laser light and high-frequency LIPSSs with a subwavelength period much smaller than the laser wavelength [8,9,10,11]. Various physical mechanisms have been proposed to interpret the formation of lowand high-frequency LIPSSs on different materials [12,13,14] It is remarkable, that in most cases low-frequency LIPSSs are perpendicular to the polarization of the irradiated laser light while high-frequency LIPSSs are parallel to the laser polarization. Only highfrequency LIPSSs can be exploited to realize polarization imprinting with a subwavelength spatial resolution [15]
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