• K. Sivagami, G. Divyapriya, R. Selvaraj, P. Madhiyazhagan, N. Sriram, and I. Nambi, "Catalytic pyrolysis of polyolefin and multilayer packaging-based waste plastics: A pilot scale study," Process Saf. Environ. Prot. 149, 497-506 (2021). Impact factor: 6.158; DOI: 10.1016/j.psep.2020.10.038
• R. Selvaraj, N. J. Vasa, S. M. S. Nagendra, and B. Mizaikoff, "Advances in Mid-Infrared Spectroscopy-Based Sensing Techniques for Exhaled Breath Diagnostics," Molecules 25 (9), 2227 (2020). Impact factor: 4.411; DOI: doi.org/10.3390/molecules25092227
• R. Selvaraj, N. Vasa, and S. M. S. Nagendra, "Off-Resonance Photoacoustic Spectroscopy Technique for Multi-Gas Sensing in Biogas Plants," Anal. Chem. 91, 14239–14246 (2019). Impact factor: 6.785;  DOI: 10.1021/acs.analchem.9b01513
• R. Selvaraj, N. J. Vasa, and S. M. S. Nagendra, "Off-resonant photoacoustic spectroscopy for analysis of multicomponent gas mixtures at high concentrations using broadband vibrational overtones of individual gas species," Appl. Opt. 58, 4118 -4126 (2019). Impact factor: 2.191; DOI: 10.1364/AO.58.004118
• R. Selvaraj, A. N. K.T., N. J. Vasa, and S. M. S. Nagendra, "Monitoring of CO₂ and CH₄ composition in a biogas matrix from different biomass structures," Sensors Actuators, B Chem. 249, 378-385 (2017). Impact factor: 7.1; DOI: 10.1016/j.snb.2017.04.104

Conference Publications

• S. K. Krishnamoorthy, Y. E. B. Vidhya, R. Selvaraj, S. Seshadri and N. J. Vasa, "Photoacoustic Approach Using a Broadband Laser Source for Sensing Carbon Monoxide and Carbon Dioxide," in Conference on Lasers and Electro-Optics (CLEO-2022), 15-20 May 2022, San Jose, USA (Accepted)
• S De, R. Selvaraj and A L Chakraborty, "Measurement of the mole fraction of acetylene at locations up to 5 km away from a fiber-coupled wavelength modulated 1531.52 nm tunable laser diode", 44th OSI Symposium on Frontiers in Optics and Photonics 2021, (FOP21), 24-27 Sep, 2021, IIT Delhi
• R. Selvaraj, N J. Vasa, and S. M. S. Nagendra, " Photoacoustic sensor using broad-spectrum source for vehicle exhaust measurements," in ICOL 2019-Proceedings of the International Conference on Optics and Electro-Optics, K. Singh, A. K. Gupta, S. Khare, N. Dixit, K. Pant, eds. (Springer Singapore, 2021), Ch-70.  DOI: 10.1007/978-981-15-9259-1
• B. Baby, R. Selvaraj, N. J. Vasa, and J. K. Antony, "Supercontinuum Laser Based Photoacoustic Spectroscopic Sensor for Acetylene Gas Detection" in Progress in Optomechatronics, I. Bhattacharya, Y. Otani, P. Lutz, and S. Cherukulappurath, eds. (Springer Singapore, 2020), pp. 165–167. DOI: 10.1007/978-981-15-6467-3
• R. Selvaraj, N. J. Vasa, and S. M. S. Nagendra, "Off-Resonant Broadband Photoacoustic Spectroscopy for Online Monitoring of Biogas Concentration with a Wide Dynamic Range," in Conference on Lasers and Electro-Optics, OSA Technical Digest (Optical Society of America, 2019), paper JW2A.20. DOI: 10.1364/CLEO_AT.2019.JW2A.20
• R. Selvaraj, N. J. Vasa, and S. M. S. Nagendra, "Supercontinuum Laser Based Photoacoustic Approach for Acetylene Gas Sensing," in CLEO Pacific Rim Conference 2018, OSA Technical Digest (Optical Society of America, 2018), paper Tu3L.4. DOI: 10.1364/CLEOPR.2018.Tu3L.4
• R. Selvaraj, N. J. Vasa, and S. M. S. Nagendra, "Combined broadband photo-acoustic and absorption spectroscopic techniques of measurement for C2H2 with supercontinuum laser," in 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference, (Optical Society of America, 2017), paper CH_P_16. DOI: 10.1109/CLEOE-EQEC.2017.8086899
• R. Selvaraj, K. Sulochana, N. J. Vasa, and S. M. S. Nagendra, "Solid Etalon combined with Superluminescent Diode for Sensing of Multiple Gases Simultaneously," in 13th International Conference on Fiber Optics and Photonics, OSA Technical Digest (online) (Optical Society of America, 2016), paper W3A.74. DOI: 10.1364/PHOTONICS.2016.W3A.74
• R. Selvaraj, K. Sulochana, N. J. Vasa, and S. M. S. Nagendra, "Superluminescent Diode Coupled with Etalon for Measuring CH4 and CO2 in Biogas," in Frontiers in Optics 2015, OSA Technical Digest (online) (Optical Society of America, 2015), paper FTh2A.3. DOI: 10.1364/FIO.2015.FTh2A.3

Patents

• Ramya Selvaraj, Nilesh J Vasa, Shiva Nagendra S M, "Off Resonant Broadband Absorption based Photoacoustic Sensor for Multiple Gas Sensing". Grant no: 382157; Grant Date: 22/11/2021
• Ramya Selvaraj, Sivagami K., Divyapriya G., Keshav V., Aravind E.S., "Environmentally Friendly Catalytic Depolymerization Focusing on Managing Plastic Waste at Source" (Indian Patent filed: No. 201841032117 on 28/08/2018)

Awards:

• Early career fellowship at IIT Gandhinagar (2020-21)

Sponsored Projects:

•  A project titled ,"3D printed substrate integrated hollow waveguide based photoacoustic interferometry for eNO detection", worth approximately Rs. 58 lakhs has been approved by Science and Engineering Research Board (SERB).

Invited Talks

• "Introduction to Photoacoustic Spectroscopy and its applications", Workshop on Imaging and Optical Sensing Technologies (WIOST–2021), 10-12 November 2021, Chennai, India.

• "Novel Sensor Technologies for Air Pollution Monitoring",6th Indian International Conference on Air Quality Management (IICAQM 2021) - Measurement, Modelling, Health Risk, and Public Policy, 14-18 December 2021, IIT Guwahati, India.

• "Measures and action plans from perspective stakeholders-Panel Discussion", at the Clean Air Mitigation plan  for Mega Cities and Challenges Workshop, organized by The Clean Environment and Planetary Health in Asia (CEPHA) network, IIT Madras, 22 March 2022, Westin-Chennai, India