SGX Stock Exchange congratulates Metasurface Technologies Holdings Limited (Metasurface) on its dual listing on Catalist under stock code “MET”.  Metasurface is a Singapore-headquartered precision engineering services provider established in 2000. The company specialises in precision machining and precision welding for international customers in the semiconductor, aerospace and data storage industries. It has production facilities in Singapore and Malaysia, and its customers have manufacturing bases across Singapore, Malaysia, Japan, the United States of America, South Korea and India. The company has been listed on the Hong Kong Stock Exchange GEM board since July 2024. Chua Chwee Lee, Founder, Executive Director and CEO of Metasurface Technologies Holdings Limited, said, “Our dual primary listing on Catalist marks an important milestone for Metasurface, giving investors in Singapore, where we are headquartered, the opportunity to participate in our growth. For more than 20 years, we have built our reputation on precision and consistency, serving customers in the semiconductor industry as well as in the aerospace and data storage sectors. Proceeds from the placement will enable us to invest in advanced 5-axis machines and software, and to strengthen our quality control capabilities, so that we continue to meet the exacting standards our customers expect. We thank our investors for their support and look forward to welcoming new shareholders in Singapore.” Koh Jin Hoe, Head of Capital Markets, Global Sales and Origination, SGX Group, said, “From the microchips in our daily devices to advanced aviation, precision engineering is what makes modern technology possible. Metasurface’s listing on SGX provides an opportunity for our investors to connect with a homegrown champion that serves global technology leaders, adding valuable depth to Singapore’s high-tech manufacturing ecosystem.”  Metasurface Technologies Holdings Limited opened at S$0.54 today.

Nonlocal metasurfaces enable all-optical processing of spatial information in optical fields. Here, we demonstrate a topology-optimised metasurface that switches between phase-contrast and brightfield...

Nonlinear metasurfaces with subwavelength thickness were recently established as versatile platforms for the enhanced and tailorable generation of entangled photon pairs. The small dimensions and inhe...

We first study a dielectric metasurface composed of square nanoresonators with side length w0, arranged in a C4-symmetric square array on a silicon dioxide (SiO2) substrate. Given this symmetry, the structure supports a non-radiative, doubly degenerate mode at the Γ point, provided that the constituent medium is isotropic. To introduce asymmetry, thereby accessing radiative channels of the modes while preserving the overall C4-symmetric shape, we define a perturbation parameter α, and express the side lengths of the new prisms as (Fig. 1a): $${w}_{1}={w}_{0}{\left(\dfrac{2}{1+{\alpha }^{2}}\right)}^{1/2},\quad {w}_{2}={w}_{0}{\left(\dfrac{2}{1+{\alpha }^{2}}\right)}^{1/2}\alpha ,$$ where the in-plane footprint remains constant, whereas the unit cell increases in size by a factor of \(\sqrt{2}\), leading to Brillouin-zone folding. As a result, the dark degenerate modes at the original Γ point are transformed into two radiative qBICs (Brillouin-zone-folding qBICs43), which we denote as mode 1 and mode 2. Note that C4-symmetry here refers to the shape of the resonator lattice: once the resonators are fabricated from ReS2, the anisotropic permittivity tensor reduces the overall symmetry of the full system to C2. Spectral tunability of the qBICs is enabled by applying an in-plane scaling factor S to the structure. The electric field profiles of both modes are shown in Fig. 1d...

We first study a dielectric metasurface composed of square nanoresonators with side length w0, arranged in a C4-symmetric square array on a silicon dioxide (SiO2) substrate. Given this symmetry, the structure supports a non-radiative, doubly degenerate mode at the Γ point, provided that the constituent medium is isotropic. To introduce asymmetry, thereby accessing radiative channels of the modes while preserving the overall C4-symmetric shape, we define a perturbation parameter α, and express the side lengths of the new prisms as (Fig. 1a): $${w}_{1}={w}_{0}{\left(\dfrac{2}{1+{\alpha }^{2}}\right)}^{1/2},\quad {w}_{2}={w}_{0}{\left(\dfrac{2}{1+{\alpha }^{2}}\right)}^{1/2}\alpha ,$$ where the in-plane footprint remains constant, whereas the unit cell increases in size by a factor of \(\sqrt{2}\), leading to Brillouin-zone folding. As a result, the dark degenerate modes at the original Γ point are transformed into two radiative qBICs (Brillouin-zone-folding qBICs43), which we denote as mode 1 and mode 2. Note that C4-symmetry here refers to the shape of the resonator lattice: once the resonators are fabricated from ReS2, the anisotropic permittivity tensor reduces the overall symmetry of the full system to C2. Spectral tunability of the qBICs is enabled by applying an in-plane scaling factor S to the structure. The electric field profiles of both modes are shown in Fig. 1d...

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Qiang Ren/Kaiming Wu/Na Liu