Guangzhou Geng's research while affiliated with Technical Institute of Physics and Chemistry and other places

... in information processing and storage [46]. In particular, chalcogenide phase-change materials (PCMs) are uniquely poised for the photonic modulation and resonance tuning of reconfigurable metasurfaces, owing to their striking portfolio of properties [47][48][49][50][51][52][53]. PCMs can be rapidly and reversibly switched between amorphous and crystalline states, and the two states show pronounced contrast in optical and electronic properties. ...

... Miniaturization and higher integration of on-chip optical systems 1 necessitate more device adaptability, versatility, and data storage capacity [2][3][4][5] . Metasurfaces, a form of ultrathin planar optical component, have emerged as an advanced scheme for controlling light and enabling a wide range of optical applications in previous studies [6][7][8][9][10][11][12] . Especially for terahertz waves with high-capacity communications, metasurfaces provide a potential solution to the lack of functional devices. ...

... Metasurfaces, as novel ultrathin planar optical elements, offer an innovative platform for flexibly manipulating the fundamental properties of light [13][14][15][16], including amplitude, [17,18] phase, [19,20] polarization, [21,22] and orbit angular momentum [23,24]. By employing diverse meta-atoms, metasurfaces provide a high degree of freedom to control the wavefront of light with subwavelength resolution, breaking the limitations of traditional diffraction and refraction optics. ...

... The device exhibits reasonable sensitivity to changes in surrounding refractive indices, indicating potential applications in environmental monitoring, biosensing, and point-of-care testing while maintaining a small physical footprint [30]. Indeed, the current state-of-the-art nanofabrication techniques allow for topologically optimized systems with minimum feature sizes similar to our proposed structures [31]. However, it is important to note that the behavior of fluids on non-uniformly patterned nano surfaces should be carefully considered [31][32][33]. ...

... Metasurfaces are arrays of subwavelength structures capable of shaping the wavefront (phase) of incident light. On-chip one-dimensional (1D) metasurfaces provide an innovative approach to on-chip wavefront shaping [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. On-chip one-dimensional metasurface-based systems can operate without alignment step but limited to process one-dimensional data. ...

... To realize active wavefront control, the combining schemes of the smetasurfaces with active materials or MEMS technologies that can introduce dynamically controlled phases are generally used [16][17][18][19][20][21]. For instance, thermal-controlled coding metasurfaces integrating with phase change materials have successfully implemented active beam manipulations [22,23]. Additionally, optical-modulated coding metasurfaces embedded in photosensitive silicones have been used for dynamic wavefront modulation [24]. ...

... Common control strategies use degree of freedom (DoFs) of light such as wavelength, polarization, incident angle, optical structure, and level of irradiance as control dimensions [16]. These multi-dimensional control strategies manipulate the incident light [17,18], modulator [19,20], and outgoing light [21,22] to achieve hologram multiplexing. ...

... As it is widely recognized, 3D models provide more precise descriptions of morphological characteristics than 2D images, as they incorporate spatial location information of objects (Jing et al. 2022;Nobukawa et al. 2019). Oblique photography and 3D modeling, as imaging techniques that capture the three-dimensional structure of an object from multiple viewpoints, have gained significant importance in diverse scientific domains (Xiang and Wang 2023). ...

... Metasurfaces, which are the two-dimensional counterparts of metamaterials, enable unprecedented capabilities in the local manipulation of the light's amplitude, phase and polarization, leading to a variety of applications in the generalized Snell's law [1,2], polarization control and analysis [3][4][5][6][7][8][9], spin-Hall effects [10][11][12][13], light beam shaping [14,15], holograms [16][17][18][19][20][21], metalenses [22][23][24][25][26][27][28][29][30], etc. As a typical functional device, a multi-foci metalens can enable functionalities in the large field of view [31] and fully reconfigurable imaging [32] that are extremely challenging to achieve with conventional lenses. ...

... As a popular compact planar optical device, the metasurface can modulate the phase, polarization, and amplitude of incident light on the subwavelength scale, replacing bulky optical components such as lenses, spatial light modulators (SLM) [21], [22], and liquid crystal (LC) [23], [24]. Recently, the combination of Dammann grating and metasurface has been used to generate 2D and 3D vortex arrays [25], [26], [27], [28]. However, the application of Dammann gratings to generate noncanonical vortex arrays has not been proposed. ...