Publications de Aleksandrs Leitis

Gradient High-Q Dielectric Metasurfaces for Broadband Sensing and Control of Vibrational Light-Matter Coupling

Hatice Altug, Felix Ulrich Richter, Aleksandrs Leitis

Surface-enhanced infrared absorption spectroscopy (SEIRA) has emerged as a powerful technique for ultrasensitive chemical-specific analysis. SEIRA can be realized by employing metasurfaces that can enhance light-matter interactions in the spectral bands of ...

Wiley-V C H Verlag Gmbh2024

Wafer‐Scale Functional Metasurfaces for Mid‐Infrared Photonics and Biosensing

Hatice Altug, Aurélian Michel John-Herpin, Aleksandrs Leitis, Ming-Lun Tseng

Metasurfaces have emerged as a breakthrough platform for manipulating light at the nanoscale and enabling on-demand optical functionalities for next-generation biosensing, imaging, and light-generating photonic devices. However, translating this technology ...

Wiley2021

Programmable Huygens' metasurfaces for active optical phase control

Hatice Altug, Andreas Tittl, Aleksandrs Leitis

IEEE2021

Dielectric Metasurfaces Enabling Advanced Optical Biosensors

Hatice Altug, Aleksandrs Leitis, Ming-Lun Tseng

Dielectric metasurfaces have emerged as a powerful platform for novel optical biosensors. Due to their low optical loss and strong light-matter interaction, they demonstrate several exotic optical properties, including sharp resonances, strong nearfield en ...

2021

Metasurfaces for label-free biosensing mid-infrared optics and active photonic devices

Aleksandrs Leitis

Novel two-dimensional metamaterials, known as metasurfaces, have emerged as a breakthrough platform for controlling electromagnetic wave properties at the nanoscale. These metasurfaces consist of subwavelength nanoantennas or so-called meta-atoms, which ca ...

EPFL2021

Comparison and Verification of Simulation Results of DeST Based on ASHRAE-140 Standard

Hatice Altug, Andreas Tittl, Aleksandrs Leitis

Based on the ASHRAE Standard 140-2014, this study takes the simulation results of DeST and other simulation software to comprehensively test the accuracy and validity of DeST in calculating building thermal loads and space cooling and heating equipment per ...

IEEE2021

All-Dielectric Programmable Huygens' Metasurfaces

Hatice Altug, Andreas Tittl, Aleksandrs Leitis

Low-loss nanostructured dielectric metasurfaces have emerged as a breakthrough platform for ultrathin optics and cutting-edge photonic applications, including beam shaping, focusing, and holography. However, the static nature of their constituent materials ...

2020

Angle-multiplexed all-dielectric metasurfaces for broadband molecular fingerprint retrieval

Hatice Altug, Andreas Tittl, Aleksandrs Leitis, Bang Hyun Lee, Mingkai Liu

Infrared spectroscopy resolves the structure of molecules by detecting their characteristic vibrational fingerprints. Subwavelength light confinement and nanophotonic enhancement have extended the scope of this technique for monolayer studies. However, cur ...

2019

Method and spectrometer apparatus for investigating an infrared absorption of a sample

Hatice Altug, Andreas Tittl, Aleksandrs Leitis

A method of investigating a sample (1) having an absorption within an infrared spectral range of interest, comprises the steps of creating measuring light (2) with a light source device (10), wherein the measuring light (2) includes wavelengths covering th ...

2019

Metasurface-Based Molecular Biosensing Aided by Artificial Intelligence

Hatice Altug, Andreas Tittl, Aurélian Michel John-Herpin, Aleksandrs Leitis, Eduardo Romero Arvelo

Molecular spectroscopy provides unique information on the internal structure of biological materials by detecting the characteristic vibrational signatures of their constituent chemical bonds at infrared frequencies. Nanophotonic antennas and metasurfaces ...

Wiley-VCH Verlag GmbH2019