TY  - JOUR
AU  - Markushev, D. K.
AU  - Markushev, D. D.
AU  - Aleksic, S. M.
AU  - Pantic, D. S.
AU  - Galović, S. P.
AU  - Todorović, D. M.
AU  - Ordonez-Miranda, J.
PY  - 2020
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1313
AB  - Based on the experimental and theoretical signals of an open photoacoustic cell operating with modulation frequencies from 20Hz to 20kHz, a significant contribution of photogenerated excess carriers on the thermal and thermoelastic responses of an n-type silicon plate is observed for the very first time. This is achieved by comparing the measured amplitude and phase of the photoacoustic signal with their corresponding theoretical thermoelastic counterparts, for high enough modulation frequencies mainly. It is shown that the amplitude of the thermoelastic component of plasma-thin samples varies about two orders of magnitude with respect to the corresponding one of plasma-thick samples. Furthermore, we find a maximal temperature difference Delta T=-35nK between the illuminated and non-illuminated sample surfaces, which shows that thin silicon plates with excess carriers could be used as heat sinks.
PB  - Amer Inst Physics, Melville
T2  - Journal of Applied Physics
T1  - Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon
IS  - 9
VL  - 128
DO  - 10.1063/5.0015657
ER  - 

@article{
author = "Markushev, D. K. and Markushev, D. D. and Aleksic, S. M. and Pantic, D. S. and Galović, S. P. and Todorović, D. M. and Ordonez-Miranda, J.",
year = "2020",
abstract = "Based on the experimental and theoretical signals of an open photoacoustic cell operating with modulation frequencies from 20Hz to 20kHz, a significant contribution of photogenerated excess carriers on the thermal and thermoelastic responses of an n-type silicon plate is observed for the very first time. This is achieved by comparing the measured amplitude and phase of the photoacoustic signal with their corresponding theoretical thermoelastic counterparts, for high enough modulation frequencies mainly. It is shown that the amplitude of the thermoelastic component of plasma-thin samples varies about two orders of magnitude with respect to the corresponding one of plasma-thick samples. Furthermore, we find a maximal temperature difference Delta T=-35nK between the illuminated and non-illuminated sample surfaces, which shows that thin silicon plates with excess carriers could be used as heat sinks.",
publisher = "Amer Inst Physics, Melville",
journal = "Journal of Applied Physics",
title = "Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon",
number = "9",
volume = "128",
doi = "10.1063/5.0015657"
}

Markushev, D. K., Markushev, D. D., Aleksic, S. M., Pantic, D. S., Galović, S. P., Todorović, D. M.,& Ordonez-Miranda, J.. (2020). Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon. in Journal of Applied Physics
Amer Inst Physics, Melville., 128(9).
https://doi.org/10.1063/5.0015657

Markushev DK, Markushev DD, Aleksic SM, Pantic DS, Galović SP, Todorović DM, Ordonez-Miranda J. Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon. in Journal of Applied Physics. 2020;128(9).
doi:10.1063/5.0015657 .

Markushev, D. K., Markushev, D. D., Aleksic, S. M., Pantic, D. S., Galović, S. P., Todorović, D. M., Ordonez-Miranda, J., "Experimental photoacoustic observation of the photogenerated excess carrier influence on the thermoelastic response of n-type silicon" in Journal of Applied Physics, 128, no. 9 (2020),
https://doi.org/10.1063/5.0015657 . .

TY  - JOUR
AU  - Veljović-Jovanović, Sonja
AU  - Vidović, Marija
AU  - Morina, Filis
AU  - Prokic, Ljiljana
AU  - Todorović, D. M.
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1004
AB  - Green-white variegated leaves of Pelargonium zonale were studied using the photoacoustic method. Our aim was to characterize photosynthetically active green tissue and nonphotosynthetically active white tissue by the photoacoustic amplitude signals. We observed lower stomatal conductance and higher leaf temperature in white tissue than in green tissue. Besides these thermal differences, significantly higher absorbance in green tissue was based on chlorophyll and carotenoids which were absent in white tissue. However, optical properties of epidermal layers of both tissues were equal. The photoacoustic amplitude of white tissue was over four times higher compared to green tissue, which was correlated with lower stomatal conductance. In addition, at frequencies >700 Hz, the significant differences between the photoacoustic signals of green and white tissue were obtained. We identified the photoacoustic signal deriving from photosynthetic oxygen evolution in green tissue, using high intensity of red light modulated at 10 Hz. Moreover, the photoacoustic amplitude of green tissue increased progressively with time which corresponded to the period of induction of photosynthetic oxygen evolution. For the first time, very high frequencies (1 kHz to 5 kHz) were applied on leaf material.
PB  - Springer/Plenum Publishers, New York
T2  - International Journal of Thermophysics
T1  - Comparison of Photoacoustic Signals in Photosynthetic and Nonphotosynthetic Leaf Tissues of Variegated Pelargonium zonale
IS  - 9
VL  - 37
DO  - 10.1007/s10765-016-2092-7
ER  - 

@article{
author = "Veljović-Jovanović, Sonja and Vidović, Marija and Morina, Filis and Prokic, Ljiljana and Todorović, D. M.",
year = "2016",
abstract = "Green-white variegated leaves of Pelargonium zonale were studied using the photoacoustic method. Our aim was to characterize photosynthetically active green tissue and nonphotosynthetically active white tissue by the photoacoustic amplitude signals. We observed lower stomatal conductance and higher leaf temperature in white tissue than in green tissue. Besides these thermal differences, significantly higher absorbance in green tissue was based on chlorophyll and carotenoids which were absent in white tissue. However, optical properties of epidermal layers of both tissues were equal. The photoacoustic amplitude of white tissue was over four times higher compared to green tissue, which was correlated with lower stomatal conductance. In addition, at frequencies >700 Hz, the significant differences between the photoacoustic signals of green and white tissue were obtained. We identified the photoacoustic signal deriving from photosynthetic oxygen evolution in green tissue, using high intensity of red light modulated at 10 Hz. Moreover, the photoacoustic amplitude of green tissue increased progressively with time which corresponded to the period of induction of photosynthetic oxygen evolution. For the first time, very high frequencies (1 kHz to 5 kHz) were applied on leaf material.",
publisher = "Springer/Plenum Publishers, New York",
journal = "International Journal of Thermophysics",
title = "Comparison of Photoacoustic Signals in Photosynthetic and Nonphotosynthetic Leaf Tissues of Variegated Pelargonium zonale",
number = "9",
volume = "37",
doi = "10.1007/s10765-016-2092-7"
}

Veljović-Jovanović, S., Vidović, M., Morina, F., Prokic, L.,& Todorović, D. M.. (2016). Comparison of Photoacoustic Signals in Photosynthetic and Nonphotosynthetic Leaf Tissues of Variegated Pelargonium zonale. in International Journal of Thermophysics
Springer/Plenum Publishers, New York., 37(9).
https://doi.org/10.1007/s10765-016-2092-7

Veljović-Jovanović S, Vidović M, Morina F, Prokic L, Todorović DM. Comparison of Photoacoustic Signals in Photosynthetic and Nonphotosynthetic Leaf Tissues of Variegated Pelargonium zonale. in International Journal of Thermophysics. 2016;37(9).
doi:10.1007/s10765-016-2092-7 .

Veljović-Jovanović, Sonja, Vidović, Marija, Morina, Filis, Prokic, Ljiljana, Todorović, D. M., "Comparison of Photoacoustic Signals in Photosynthetic and Nonphotosynthetic Leaf Tissues of Variegated Pelargonium zonale" in International Journal of Thermophysics, 37, no. 9 (2016),
https://doi.org/10.1007/s10765-016-2092-7 . .