Abstract
A new method of utilizing photothermal effect at nano-volume dimensions to measure viscosity is presented here that can, in turn, provide the surrounding temperature. Our measurements use high repetition rate, low average power, femtosecond laser pulses that induce photothermal effect that is highly influence by the convective mode of heat transfer. This is especially important for absorbing liquids, which is unlike the typical photothermal effects that are due to such ultrashort pulses. Typical thermal processes involve only conductive mode of heat transfer and are phenomenological in nature. Inclusion of convective mode results in additional molecular characteristics of the thermal process. We measure traditional thermal lens with femtosecond pulse train through geometric beam divergence of a collimated laser beam co-propagating with the focused heating laser beam. The refractive index gradient in the sample arising from a focused heating laser creates a thermal lens, which is measured. On the other hand, the same heat gradient from the focusing heating laser beam generates a change in local viscosity in the medium, which changes the trapped stiffness of an optically trapped microsphere in its vicinity. We use co-propagating femtosecond train of laser pulses at 1560 and 780 nm wavelengths for these experiments. We also show from the bulk thermal studies that use of water as sample has the advantage of using conductive mode of heat transfer for femtosecond pulse train excitation.
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Gordon JP, Leite RCC, Moore RS, Porto SPS, Whinnery JRJ (1965) Long transient effects in lasers with inserted liquid samples. Appl Phys 36:3–8
Shen J, Lowe RD, Snook RD (1992) A model for cw laser induced mode-mismatched dual-beam thermal lens spectrometry. Chem Phys 165:385–396
Swofford RL, Morrell JA (1978) Analysis of the repetitatively pulsed dual beam thermo-optical absorption spectrometer. J Appl Phys 49:3667–3674
Kumar P, Khan A, Goswami D (2014) Importance of molecular heat convection in time resolved thermal lens study of highly absorbing samples. Chem Phys 441:5–10
Kumar P, Goswami D (2014) Importance of Molecular Structure on the Thermophoresis of Binary Mixtures. J Phys Chem B 118:14852–14859
Kumar P, Dinda S, Goswami D (2014) Effect of molecular structural isomers in thermal lens spectroscopy. Chem Phys Lett 601:163–167
Baesso ML, Bento AC, Andrade AA, Sampaio JA, Pecoraro E, Nunes LAO, Catunda T, Gama S (1998) Absolute thermal lens method to determine fluorescence quantum efficiency and concentration quenching of solids. Phys Rev B 57:10545–10549
Lima SM, Catunda T, Lebullenger R, Hernandes AC, Baesso ML, Bento AC, Miranda LCM (1999) Temperature dependence of thermo-optical properties of fluoride glasses determined by thermal lens spectrometry. Phys Rev B 60:15173–15178
Lima SM, Sampaio JA, Catunda T, Bento AC, Miranda LCM, Baesso ML (2000) Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review. J Non-Cryst Solids 273:215–227
Marcano A, Loper C, Melikechi N (2002) Pump–probe mode-mismatched thermal-lens Z scan. J Opt Soc Am B 19:119–124
Sampaio JA, Gama S, Baesso ML, Catunda T (2005) Fluorescence quantum efficiency of Er3+ in low silica calcium aluminate glasses determined by mode-mismatched thermal lens spectrometry. J Non-Cryst Solids 351:1594–1602
Marcano A, Melikechi N (2007) Continuous Wave Achromatic Thermal Lens Spectroscopy. Appl Spectrosc 61:659–664
Mondal D, Goswami D (2015) Controlling local temperature in water using femtosecond optical tweezer. Biomed Opt Express 6:3190–3196
Berg-Sørensen K, Flyvbjerg H (2004) Power spectrum analysis for optical tweezers. Rev Sci Instrum 75:595–612
Tolić-Nørrelykkea I-M, Berg-Sørensen K, Flyvbjerg H (2004) MatLab program for precision calibration of optical tweezers. Comput Phys Commun 159:225–240
Al-Shemmeri T (2012) Engineering Fluid Mechnanics. Ventus Publishing ApS
CRC Handbook of Chemistry and Physics, 85th ed. CRC Press, Boca Raton, FL (1991–1992)
Mao H, Arias-Gonzalez JR, Smith SB, Tinoco I Jr, Bustamante C (2005) Temperature control methods in a laser tweezers system. Biophys J 89:1308–1316
Tassieri M, Giudice FD, Robertson EJ, Jain N, Fries B, Wilson R, Glidle A, Greco F, Netti PA, Maffettone PL, Bicanic T, Cooper JM (2015) Microrheology with Optical Tweezers: Measuring the relative viscosity of solutions ‘at a glance’. Sci Rep 5:1–6
Acknowledgements
DG thanks funding support from ISRO-IST, Govt. of India. All authors also thank Ms. S. Goswami for meticulous manuscript language edits.
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Mondal, D., Singhal, S., Goswami, D. (2018). Femtosecond Laser-Induced Photothermal Effect for Nanoscale Viscometer and Thermometer. In: Pradhan, A., Krishnamurthy, P. (eds) Selected Topics in Photonics. IITK Directions, vol 2. Springer, Singapore. https://doi.org/10.1007/978-981-10-5010-7_2
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DOI: https://doi.org/10.1007/978-981-10-5010-7_2
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