arXiv subjects

Shlomo Hava

Publications and source records attributed to Shlomo Hava.

3 recordsLinked to original sources

arXiv2019

Upmost efficiency, few-micron-sized midwave infrared HgCdTe photodetectors

A few-micron thick structure that shows nearly 100% resonant polarized absorptance at a predefined midinfrared wavelength is designed and simulated. Like resonant-cavity enhanced photodetector structure, it contains a thin absorber enclosed in a dielectric cavity but surrogates the mirrors by two grating-on-layer structures. Fair manufacturing tolerance while maintaining high peak efficiency is proved. Electromagnetic fields amplitudes and Poynting vector over the cavity-absorber area are visualized and topology of electromagnetic power flow for two linear polarizations is discussed.

physics.optics↗

arXiv2012

IR color separation in transmission through gratings on (110) silicon: FTIR experiment versus theory

The phenomenon of filtering in zero-diffraction order is studied for transmission through 1D-periodic structures on a silicon wafer. Our study combines FTIR spectrometry in the range from 2.5 to 25 microns, and a rigorous full-vector simulation. The phenomenon exhibits itself as 'bright' and 'dark' bands in the spectra of normal transmission through grating samples, which replace each other quasi-periodically with respect to wave number, at wavelengths smaller than the grating period. The transmission modulation ratio is extremely high for two-side polished samples. Good agreement between the rigorous theory and experiment both in the range of the transmission oscillations and in the region of enhanced absorption is obtained

physics.optics↗

arXiv2012

New resonant cavity-enhanced absorber structures for mid-infrared detector application

A new dielectric Fabry-Perot cavity was designed for a resonant enhancing optical absorption by a thin absorber layer embedded into the cavity. In this cavity, the front mirror is a subwavelength grating with $\sim 100$% retroreflection. For a HgCdTe absorber in a matching cavity of the new type, the design is shown to meet the combined challenges of increasing the absorbing efficiency of the entire device up to $\sim 100$% and reducing its size and overall complexity, compared to a conventional resonant cavity enhanced HgCdTe absorber, while maintaining a fairly good tolerance against the grating's fabrication errors.

physics.optics↗