RAJ KISHOR PATIL

Optical Systems Engineer with expertise in high‑power CO₂ and EUV laser systems, optical metrology, LIDT testing and DUV Raman microscopy. Skilled in troubleshooting, beam optimization, detector characterization, and MATLAB /Zemax analysis. Experienced in developing optical setups, enhancing system reliability, and solving complex laser–plasma and contamination issues.

• Raj Patil, Sheng Lan and Achanta Venu Gopal, Fabrication of large-area two-dimensional array of air holes with different hole shapes for optical and terahertz wavelength regions., J. Nanophoton., 8, 1, 083896, 2014, 10.1117/1.JNP.8.083896
• P. Mandal, S. Anantha Ramakrishna, Raj Patil and Achanta Venu Gopal, Polarization dependent color switching by extra-ordinary transmission in H-slit plasmonic metasurface., J. Appl. Phys., 114, 224303, 2013, http://dx.doi.org/10.1063/1.4842115
• Modak S, Patil A, Patil R, et al., Silicon Based Taper Waveguides for Near Field Coupling., IEEE Photonics Conference (IEEE PHO 2011), 10/11, Arlington, Virginia, USA, Proc. IEEE Photonics Conference, 463 – 464
• Modak S, Patil A, Patil R, et al., Metal Nanoparticle Chains as Light Couplers., International Conference on Nanoscience, Technology and Societal Implications (IEEE NSTSI 11), 12/11, Bhubaneshwar, India, Proc. IEEE NSTSI11, 1-5

• Design test setup for Laser induced damage threshold testing of optical devices and coatings, The setup was optimized in Zemax and assembled for high power pulsed CO2 laser (250 W, 50KHz, 50ns) to determine the damage mechanism, damage threshold & safe operating conditions of optical devices and coatings. Mode matching and beam caustic optimization was performed for different parameters of pulse energy, repetition rate, pulse length, wavelength, fluence and operating temperature. The metrology setup measured shot to shot reflection and transmission pulses with PEMs to detect exact moment of damage and built thermal modelling of damage mechanism. A precise control over the z focus with relay range of 1.3 mm was accomplished using combination of a Nanoscan and a fast-focusing microscope.
• Built a DUV Raman imaging microscope, Designed and integrated a spectrometer with CCD, XYZ motion stage and DUV source (second harmonic generation from fiber laser) with help of necessary optics. Developed programs in LABVIEW to scan in XYZ axis for 3D imaging, to autofocus on the sample to get optimum output, to store 3D cube data, to analyze the recorded 3D cube data and to identify individual elements from a mixed Raman signal.
• Fabrication of H shaped meta-material pattern on gold surface, The fabricated pattern was used to switch the wavelength of transmitted light from visible to near infrared by changing the polarization of the incident light. Experimental measurements were done on the above fabricated structure and the results fairly agreed with the theoretical results.
• Senior Year Project on Design and Fabrication of Waveguide and Interconnects using Plasmonics, Studied the coupling of light in metal Nano-particle chains based on the phenomenon of Surface Plasmon Resonance. These Nano-particle chains acted as interconnects. Designed an optimized taper waveguide for coupling of light from source on to Nano particles chain. The project was designed and simulated in OPTIFDTD software.

• Optical Physics and Lasers (OPTI 511R)
• Nonlinear Photonics (OPTI 553)
• Introduction to Optical Spectroscopy (OPTI 568)
• Lens Design (OPTI 517)
• Optical Design and Instrumentation (OPTI 502)
• Electromagnetic Waves (OPTI 501)