20.500.12556/DiRROS-23640 Smectic bubble lasers for acoustic and pressure measurements in air and water Recently, we have demonstrated that dye-doped soap and smectic bubbles can be used as lasers. Here we investigated smectic bubble lasers for their potential to measure pressure changes in both air and water and as microphones. Smectic bubbles consist of a very thin smectic liquid crystal film. In contrast to ordinary soap bubbles, smectic bubbles are highly stable. When illuminated with a pump laser, they exhibit whispering gallery mode lasing with sharp, regularly spaced peaks in the emission spectrum. The bubbles enable extremely precise measurement of pressure changes based on wavelength shifts of the lasing peaks. We have demonstrated that smectic bubbles can be inflated under water and used as water pressure sensors. Additionally, we have used smectic bubble lasers in air as highly sensitive microphones to detect sound waves across different frequencies with advantages over conventional microphones. Their extremely thin walls result in negligible acoustic impedance. Furthermore, bubble size changes due to pressure variations depend only on bubble volume, eliminating the need for calibration and making performance independent of manufacturing precision or defects. This also leads to a linear amplitude response, and a flat frequency response over a wide range of frequencies. Unlike most microphones, bubble lasers can measure arbitrarily small frequencies down to static pressure, making them promising candidates for acoustic wave detection in various applications. smectic bubbles liquid crystal lasers smectic liquid crystals water pressure smektični mehurčki laserji smektični tekoči kristali tlak v vodi true false true American Physical Society ZDA Angleški jezik Slovenski jezik Neznano 2025-09-18 08:31:55 2025-09-18 08:31:55 2025-10-24 03:54:43 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Opis vira z dne 17. 9. 2025; str. 034023-1-034023-7 iss. 3, [article no.] 034023 Vol. 24 Sep. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-03-14 2025-08-11 2025-09-01 53 2331-7019 10.1103/p1mc-1gp6 249310979 https://journals.aps.org/prapplied/abstract/10.1103/p1mc-1gp6 1 2d810953-9459-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34987 RAZ_Korenjak_Zala_2025.pdf RAZ_Korenjak_Zala_2025.pdf Raziskovalni podatki so na voljo v repozitoriju Zenodo: https://doi.org/10.5281/zenodo.15878963. 1 7F07F571E716CD9BFC1D60AA738245CC 16b2602b8d65c70497e84ec37dbf8865fc2f630cde5ca80102d2b5a8e4e6c429 a6232225-9459-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34988 Institut Jožef Stefan 0 0 0