L. Mashev, S. Tonchev, Formation of holographic diffraction gratings in photoresist, Applied Physics A, 26 (3) 143-149 (1981)

I. Savatinova, S. Tonchev, R. Todorov, E. Venkova, E. Liarokapis, E. Anastassakis. Polyimide thin-film waveguides: Optical and Raman spectroscopic studies. Journal of Applied Physics, 67 (4) 2051-2055 (1990)

M. Kuneva, S. Tonchev, M. Pashtrapanska, I Nedkov, Proton exchange in Y-cut LiNbO3, Materials science in semiconductor processing, 3 (5-6) 581-583 (1991)

I. Savatinova, S. Tonchev, E. Popov, E. Liarokapis, C. Raptis, Raman scattering of proton exchanged LiNbO3 waveguides, Journal of Physics D: Applied Physics, 25 (1) 106 (1992)

C. Ziling, L. Pokrovskii, N. Terpugov, I. Savatinova, M. Kuneva, S. Tonchev, Optical and structural properties of annealed PE:LiNbO3 waveguides formed with pyrophosphoric and benzoic acids, Journal of applied physics, 73 (7) 3125-3132 (1993)

I. Savatinova, S. Tonchev, M. Kuneva, Phase transition study of H: LiNbO 3 waveguides by Raman spectroscopy, Applied Physics A, 56 (1) 81-86 (1993)

I. Savatinova, S. Tonchev, M. Kuneva, E. Liarokapis, Ranam scattering and phase state of H:LiTaO3 waveguide thin films, Applied Physics A (58) 481-485 (1994)

I. Savatinova, S. Tonchev, T. Popov, E. Liarokapis, C. Ziling, Journal of Physics D, Applied Physics, 27(7) 1384-1389 (1994)

I. Savatinova, S. Tonchev, T. Popov, M. Armenise, E. Liarokapis, Optical and electrooptical properties of H:LiTaO3 waveguides, Proc. SPIE 2150, Design, Simulation and Fabrication of Optoelectronic Devices and Circuits, 294-298 (1994)

C. Ziling, V. Atuchin, V. Smenenko, I. Savatinova, S. Tonchev, M. Armenise, E. Liarokapis, Optical planar waveguides in KTP single crystals made by ion-exchange, Proc. 8th International School on Condensed Matter Physics "Electronic, optoelectronic and magnetic thin films - science and technology, World Scientific (1995)

I. Savatinova, S. Tonchev, M. armenise, Electrooptic effect in proton exchanged LiNbO3 and LiTaO3, NATO ASI Series Fabrication, properties and applications of low dimensional semiconductors, eds M. Balkanski, I. Yanchev, Kluwer Academic Publishers, 309-310 (1995)

K. Nanev, I. Savatinova, S. Tonchev, T. Popov, Optical and RHEED study of strongly proton exchanged planar waveguides in LiNbO3, Journal of Opt. Communications, 16 (1) 2-6 (1995)

I. Savatinova, S. Tonchev, R. Todorov, M. Armenise, V. Passaro, Electro-optic effect in proton exchanged LiNbO3 and LiTaO3 waveguides, Journal of Lightwave Technic, 14 (3) 403-409 (1996)

S. Tonchev, B. Jordanov, M. Kuneva, I. Savatinova, M. Armenise, V. Passaro, Waveguide Mach-Zehnder Intensity Modulator produced via Proton Exchange Technology, NATO ASI Series 14 Devices Based on Low-Dimensional Semiconductor Structures, ed. M. Balkanski, Kluwer Academic Publishers, 293-296 (1996)

S. Tonchev, B. Jordanov, I. Savatinova, Guided-Wave Mach-Zehnder Modulators fabricated on LiNbO via Ti-indiffusion and proton exchange, Journal of Optical Communications (17) 509 (1996)

S. Tonchev, B. Jordanov, M. Kuneva, I. Savatinova, M. Armenise, V. Passaro, Waveguide Mach-Zehnder Intensity Modulator produced via Proton Exchange Technology, NATO ASI Series 14 "Devices Based on Low-Dimensional Semiconductor Structures, ed. M. Balkanski, Kluwer Academic Publishers, 293-296 (1996)

C. Ziling, V. Atuchin, I. Savatinova, S. Tonchev, M. Armenise, V. Passaro, Control of Lightguiding in H:LiTaO3 and H:LiNbO3 thin films, NATO ASI Series 42 "Advanced Electronic Technologies and Systems Based on Low-Dimensional Quantum Devices, eds M. Balkanski, N. Andreev, Kluwer Academic Publisher, 277-280 (1996)

C. Ziling, V. Atuchin, I. Savatinova, S. Tonchev, M. Armenise, V. Passaro, The influence of cooling rate on the stability of z-cut H:LiTaO3 waveguides, Journal of Physics D: Applied Physics, 30 (19) 2698-2703 (1997)

R. Barberi, I. Dozov, M. Giocondo, M. Iovane, P. Martinot-Lagarde, D. Stoenescu, S. Tonchev, L. Tsonev, Azimuthal anchoring of nematic on undulated substrate: Elasticity memory, The European Physical Journal B-Condensed Matter and Complex Systems 6 (1) 83-91 (1998)

I. Kalabin;V. Atuchin, D. Dimova-Malinovska, T. Grigorieva, S. Tonchev, I. Savatinova, I. Savova, C. Ziling, High-temperature phases in H/sub x/Li/sub 1-x/TaO/sub 3/ waveguide layers, Siberian Russian Student Workshop on Electron Devices and Materials. Proceedings 2nd Annual (IEEE Cat. No.01EX469) (2001)

I. Savatinova, S. Tonchev, P. Kircheva, Photorefractive optical damage in protonated LiNbO3 waveguides, Ferroelectrics, 249(3-4), 257-268 (2001)

V. Atuchin, D. Dimova-Malinovska, T. Grigorieva, I. Kalabin, I. Savatinova, I. Savova, E. Spesivtsev, S. Tonchev, C. Ziling, Metastable phases in HxLi1-xTaO3 waveguide layers, Appl. Phys. B, 73(5-6), 559-563 (2001)

I. Savatinova, S. Tonchev, R. Todorov, M. Armenise, V. Passaro, Electro-optic effect in proton exchanged LiNbO/sub 3/and LiTaO/sub 3/waveguides, Journal of lightwave technology, 14 (3) 403-409 (2002)

N. Destouches, A. Tishchenko, J. Pommier, S. Reynaud, O. Parriaux, S Tonchev, M. Ahmed, 99% efficiency measured in the -1st order of a resonant grating, Optics Express, 13 (9) 3230-3235 (2005)

N Destouches, JC Pommier, O Parriaux, T Clausnitzer, N Lyndin, S. Tonchev, Narrow band resonant grating of 100% reflection under normal incidence, Optics express, 14 (26) 12613-12622 (2006)

J. Bisson, O. Parriaux, J. Pommier, S. Tonchev, K. Ueda, A polarization-stabilized microchip laser using a resonant grating mirror, Applied Physics B, 85 (4) 519-524 (2006)

F. Canova, O. Uteza, J. Chambaret, M. Flury, S. Tonchev, R. Fechner, High-efficiency, broad band, high-damage threshold high-index gratings for femtosecond pulse compression, Optics express, 15 (23) 15324-15334 (2007)

A. Dikovska, P. Atanasov, S. Tonchev, J. Ferreira, L. Escoubas, Periodically structured ZnO thin films for optical gas sensor application, Sensors and Actuators A: Physical, 140 (1) 19-23 (2007)

Y. Jourlin, S. Tonchev, A. Tishchenko, C. Pedri, C. Veillas, O. Parriaux, Spatially and polarization resolved plasmon mediated transmission through continuous metal films, Optics express, 17 (14) 12155-12166 (2009)

F. Garrelie, J. Colombier, F. Pigeon, S. Tonchev, N. Faure, M. Bounhalli, Evidence of surface plasmon resonance in ultrafast laser-induced ripples, Optics express, 19 (10) 9035-9043 (2011)

R. Blandino, M. Genoni, J. Etesse, M. Barbieri, M. Paris, P. Grangier, Homodyne estimation of Gaussian quantum discord, Physical review letters, 109 (18) 180402 (2012)

T. Kampfe, S. Tonchev, A. Tishchenko, D. Gergov, O. Parriaux, Azimuthally polarized laser mode generation by multilayer mirror with wideband grating-induced TM leakage in the TE stopband, Optics express, 20 (5) 5392-5401 (2012)

M. Kuneva, S. Tonchev, K. Christova, Phase Composition and Stress in Proton Exchanged Waveguide Layers in LiNbO3 and LiTaO3, In: Newest Updates in Physical Science Research, Vol. 5 (2021) pp.140-151

A. Deka, D. Mihaylova, S. Tonchev, S. Zheleznyak, A novel method for fabrication of dual-blazed diffraction gratings using mosaicking technique, Optics and Laser Technology, 163 (2) (2023)