Conferences

* Last Author(s)/Corresponding Author(s); † Equal contributions

1. Ahmad, Azeem, Pawel Goclowski, Vishesh Dubey, and Balpreet S. Ahluwalia. "Deep tissue imaging with optical diffraction tomography." In Quantitative Phase Imaging XII, p. PC1386102. SPIE, 2026. Link 

2. Ahluwalia, Balpreet S., Veronika Žáková, Anna Neumanová, Marie K. Mikkelborg, Bilal M. Afzal, Vishesh K. Dubey, Hong Mao et al. "Tunnelling nanotubes in live action: a correlative microscopy perspective." In Quantitative Phase Imaging XII, p. PC138610K. SPIE, 2026. Link 

3. Anowarul Habib, Paula Casasano Mateos, Vishesh Kumar Dubey, Mukesh Varshney, Azeem Ahmad, Balpreet Singh Ahluwalia, Frank Melandsø, “1P5-3 Acoustic Imaging of Brain Organoids with Coded Excitation.” Proceedings of Symposium on Ultrasonic Electronics, vol 46, p. 48, 2025. Link 

4. Gocłowski, Paweł, Julianna Winnik, Vishesh Dubey, Piotr Zdańkowski, Maciej Trusiak, Ujjwal Neogi, Mukesh Varshney, Balpreet S. Ahluwalia, and Azeem Ahmad*. "Correlative common-path refractive index tomography and fluorescence of organoid." In Digital Holography and Three-Dimensional Imaging, pp. DW3C-3. Optica Publishing Group, 2025. Link 

5. S. K. Gupta, S. Ojha, S. K. Gupta, A. Ahmad, and A. Habib, “Extended Depth Acoustic Imaging with AutoSAFT and Block-Matching 4D Filtering,” Proc. 48th Scandinavian Symp. Phys. Acoust., Geilo, Norway, Jan. 26–29, 2025. Link 

6. Khan, M. Sarim Ameed, Shivam Ojha, Komal Agarwal, Amit Shelke, Azeem Ahmad, and Anowarul Habib. "2P2-13 Coded Signal Scanning Acoustic Microscopy." In Proceedings of Symposium on Ultrasonic Electronics, vol. 45, p. 111. Institute for Ultrasonic Elecronics, 2024. Link 

7. Shelke, Amit, Shivam Ojha, Biswajoy Ghosh, Md Mamun Molla, Frank Melandsø, Azeem Ahmad, and Anowarul Habib. "2E2-2 Mechanical properties estimation of PVDF polymer using scanning acoustic microscopy." In Proceedings of Symposium on Ultrasonic Electronics, vol. 45, p. 83. Institute for Ultrasonic Elecronics, 2024. Link 

8. Saxena, Anuj, Azeem Ahmad, Vishesh Dubey, Hong Mao, Anand Kumar, Anowarul Habib, Satish Kumar Dubey, Balpreet Singh Ahluwalia, and Dalip Singh Mehta. "Common-path off-axis differential interference contrast microscope for monitoring cell dynamics." In Unconventional Optical Imaging IV, vol. 12996, pp. 173-177. SPIE, 2024. Link 

9. Herath, Kithmini, Udith Haputhanthri, Ramith Hettiarachchi, Hasindu Kariyawasam, Raja N. Ahmad, Azeem Ahmad, Balpreet S. Ahluwalia, Chamira US Edussooriya, and Dushan N. Wadduwage. "All-optical phase retrieval microscope designed using differentiable microscopy." In Computational Optical Imaging and Artificial Intelligence in Biomedical Sciences, p. PC128570P. SPIE, 2024. Link 

10. Afzal, M. Bilal, Azeem Ahmad, Dhivya B. Thiyagarajan, Deanna L. Wolfson, Balpreet S. Ahluwalia, and Roy A. Dalmo. "Uncovering real-time interaction of polystyrene particles and cells from scales of Atlantic salmon by quantitative phase microscopy." In Quantitative Phase Imaging X, vol. 12852, pp. 32-36. SPIE, 2024. Link 

11. Singh, Himanshu, Komal Agarwal, Azeem Ahmad, Kaushik Shukla, Sanat Wagle, Frank Melandsø, and Anowarul Habib. "Digital refocusing in acoustic microscopy images using adversarial autoencoders." In 2023 IEEE International Ultrasonics Symposium (IUS), pp. 1-4. IEEE, 2023. Link 

12. Saxena, Anuj, Azeem Ahmad, Vishesh Dubey, Sathi Das, Anowarul Habib, Balpreet Singh Ahluwalia, and Dalip Singh Mehta. "Highly temporal phase stable common-path quantitative phase microscope." In European Conference on Biomedical Optics, p. 126300P. Optica Publishing Group, 2023. Link 

13. Mehta, Dalip Singh, Shilpa Tayal, Azeem Ahmad, Sunil Bhatt, Vishesh Kumar Dubey, Ankit Butola, and Balpreet Singh Ahluwalia. "Effect of partial spatial coherence of light on quantitative phase microscopy of biological samples: improved spatial phase sensitivity, space-bandwidth product, and high accuracy in phase measurement." In Quantitative Phase Imaging IX, vol. 12389, pp. 108-114. SPIE, 2023. Link 

14. Haputhanthri, Udith, Kithmini Herath, Ramith Hettiarachchi, Hasindu Kariyawasam, Azeem Ahmad, Balpreet S. Ahluwalia, Chamira US Edussooriya, and Dushan N. Wadduwage. "From hours to seconds: towards 100x faster quantitative phase imaging via differentiable microscopy (Conference Presentation)." In Quantitative Phase Imaging IX, p. PC1238909. SPIE, 2023. Link 

15. Ahluwalia, Balpreet Singh, Azeem Ahmad, Vishesh Kumar Dubey, and Ankit Butola. "Quantitative phase microscopy for life science and diagnosis (Conference Presentation)." In Quantitative Phase Imaging IX, p. PC123890G. SPIE, 2023. Link 

16. Das, Sathi, Kanchan Saxena, Abdolrahman Khezri, Vishesh Dubey, Azeem Ahmad, Jean-Claude Tinguely, Dalip Singh Mehta, Rafi Ahmad, and Balpreet Singh Ahluwalia. "Rapid identification of antimicrobial drug resistance strains of E-coli using SERS nanowire chip." In Plasmonics in Biology and Medicine XX, vol. 12396, pp. 64-69. SPIE, 2023. Link 

17. Mehta, Dalip Singh, Sunil Bhatt, Harpreet Kaur, Pitambar Mukherjee, Dibakar Borah, Azeem Ahmad, Anand Kumar, and Ankit Butola. "Longitudinal spatial coherence gated line-field optical coherence tomography of multilayer structures with speckle-free and reduced crosstalk." In Label-free Biomedical Imaging and Sensing (LBIS) 2023, vol. 12391, pp. 150-156. SPIE, 2023. Link 

18. Dubey, Vishesh Kumar, Azeem Ahmad, Luis E. Villegas, Hong Mao, Mona Nystad, Ganesh Acharya, and Balpreet Singh Ahluwalia. "Photonic-chip based multimodal optical imaging of formalin-fixed paraffin-embedded tissue sections (Conference Presentation)." In Multimodal Biomedical Imaging XVIII, vol. 12371, p. 1237103. SPIE, 2023. Link 

19. Singh, Himanshu, Kaushik Shukla, Azeem Ahmad, Prakhar Kumar, Frank Melandsø, and Anowarul Habib. "2Pa2-5 Deep learning-based digital refocusing in acoustic microscope." In Proceedings of Symposium on Ultrasonic Electronics, vol. 43, p. 191. Institute for Ultrasonic Elecronics, 2022. Link 

20. Gupta, Shubham Kumar, Azeem Ahmad, Prakhar Kumar, Frank Melandsø, and Anowarul Habib. "1Pa1-5 Image denoising in acoustic field microscopy." In Proceedings of Symposium on Ultrasonic Electronics, vol. 43, p. 9. Institute for Ultrasonic Elecronics, 2022. Link 

21. Butola, Ankit, David A. Coucheron, Karolina Szafranska, Azeem Ahmad, Hong Mao, Jean-Claude Tinguely, Peter McCourt et al. "Quantitative phase imaging and on-chip nanoscopy for 3D imaging of liver sinusoidal endothelial cells." In Digital Holography and Three-Dimensional Imaging, pp. W4A-2. Optica Publishing Group, 2022. Link 

22. Bhatt, Sunil, Ankit Butola, Pramila Thapa, Anuj Saxena, Azeem Ahmad, and Dalip Singh Mehta. "Partially spatially coherent light-based multispectral quantitative phase microscopy." In Optics and the Brain, pp. JTu3A-19. Optica Publishing Group, 2022. Link 

23. Borah, Dibakar, Sunil Bhatt, Anand Kumar, Azeem Ahmad, Ankit Butola, and Dalip Singh Mehta. "Study of Longitudinal Spatial Coherence Length of Monochromatic Light Sources for Sectioning of Multi-layered Samples." In Optical Tomography and Spectroscopy, pp. JTu3A-16. Optica Publishing Group, 2022. Link 

24. Shukla, Kaushik, Azeem Ahmad, Balpreet Singh Ahluwalia, Frank Melandsø, and Anowarul Habib. "Finite element simulation of transmission and reflection of acoustic waves in the ultrasonic transducer." Japanese Journal of Applied Physics 61, no. SG (2022): SG1029. Link 

25. Kumar, Prakhar, Nitin Yadav, Aditya Jethliya, Azeem Ahmad, Frank Melandsø, and Anowarul Habib. "2Pa2-6 Defocus correction in Scanning Acoustic Microscopy." In Proceedings of Symposium on Ultrasonic Electronics, vol. 42, pp. 2Pa2-6. Institute for Ultrasonic Elecronics, 2021.Link 

26. Shukla, Kaushik, Azeem Ahmad, Balpreet Singh Ahluwalia, Frank Melandsø, and Anowarul Habib. "2Pa2-7 Finite element modeling of acoustic transmission and reflection loss in ultrasound transducer." In Proceedings of Symposium on Ultrasonic Electronics, vol. 42, pp. 2Pa2-7. Institute for Ultrasonic Elecronics, 2021.Link 

27. Bhattacharya, Sayantani, Prakhar Kumar, Nitin Yadav, Azeem Ahmad, Frank Melandsø, and Anowarul Habib. "2Pb2-2 Multiple damage detection in piezoelectric ceramic sensor using scanning point contact excitation and detection method." In Proceedings of Symposium on Ultrasonic Electronics, vol. 42, pp. 2Pb2-2. Institute for Ultrasonic Elecronics, 2021. Link 

28. Gupta, Shubham Kumar, Azeem Ahmad, Balpreet Singh Ahluwalia, Frank Melandsø, and Anowarul Habib. "2Pb2-1 Ultrasonic signal denoising using hybrid filter for image reconstruction." In Proceedings of Symposium on Ultrasonic Electronics, vol. 42, pp. 2Pb2-1. Institute for Ultrasonic Elecronics, 2021. Link 

29. N. Jayakumar, F. T. Dullo, V. K. Dubey, A. Ahmad, J. Cauzzo, E. Mazagao Guerreiro, O. Snir, N. Skalko-Basnet, K. Agarwal, and B. S. Ahluwalia, “Label-free imaging on waveguide platform with enhanced resolution and contrast. Link 

30. A. Kumar, A. Ahmad, V. Dubey, A. Butola, and D. S. Mehta, “Effect of detector’s noise in white light interferometry based quantitative phase microscopy,” in Proc. ICOL 2019, pp. 621–624, published online Mar. 2, 2021. Link 

31. A. Butola, R. Joshi, K. Usmani, S. Bhatt, S. R. Kanade, A. Kumar, A. Ahmad, and D. S. Mehta, “Discrete cosine transform and total variation denoising based optimization approach for pixelation removal in fiber optic imaging system,” in OSA Technical Digest (Optica Publishing Group), Imaging and Applied Optics Congress 2020, paper JW2A.10. Link 

32. Priyadarshi, Anish, Dullo, Firehun, Ahmad, Azeem, Jayakumar, Nikhil, Ahluwalia, Balpreet and Murugan, Ganapathy Senthil (2019) Tantalum Pentoxide waveguide chip developed directly on thin transparent substrate for fluorescence microscopy of biological cells. Norwegian Nano Symposium 2019, , Trondheim, Norway. 16 - 17 Oct 2019. Link 

33. Ahmad, Azeem, Vishesh Dubey, Ankit Butola, Dalip Singh Mehta, and Balpreet Singh Ahluwalia. "Novel highly stable wavelength independent quantitative phase microscope." In Digital Holography and Three-Dimensional Imaging, pp. W1B-6. Optica Publishing Group, 2019. Link 

34. A. Ahmad, N. Jayakumar, A. Butola, V. Dubey, D. S. Mehta, and B. S. Ahluwalia, “High space-bandwidth product with high spatial phase sensitivity in single-shot digital holographic microscopy,” in OSA Technical Digest (Optica Publishing Group), Digital Holography and Three-Dimensional Imaging 2019, paper W2B.5, 2019. Link 

35. Ahmad, Azeem, Nikhil Jayakumar, Ankit Butola, Vishesh Dubey, Dalip Singh Mehta, and Balpreet Singh Ahluwalia. "High space-bandwidth product with high spatial phase sensitivity in single-shot digital holographic microscopy." In Digital Holography and Three-Dimensional Imaging, pp. W2B-5. Optica Publishing Group, 2019. Link 

36. Butola, Ankit, Daria Popova, Azeem Ahmad, Vishesh Dubey, Ganesh Acharya, Purusotam Banet, P. Senthilkumaran, Balpreet Singh Ahluwalia, and Dalip Singh Mehta. "Classification of human spermatozoa using quantitative phase imaging and machine learning." In Digital Holography and Three-Dimensional Imaging, pp. Th4A-3. Optica Publishing Group, 2019. Link 

37. P. Basnet, R. Singh, D. L. Wolfson, V. Dubey, A. Ahmad, G. Acharya, D. S. Mehta, and B. S. Ahluwalia, “Trophoblast and macrophage change their sub-cellular structures in response to externally induced inflammation as shown by structured illumination microscopy and quantitative phase microscopy,” in Placenta, vol. 69, pp. E28–E28, 2018.

38. Singla, Neeru, Kavita Dubey, Vishal Srivastava, Azeem Ahmad, and D. S. Mehta. "Automated high resolution full-field spatial coherence tomography for quantitative phase imaging of human red blood cells." In Quantitative Phase Imaging IV, vol. 10503, pp. 212-215. SPIE, 2018. Link 

39. Mehta, Dalip Singh, Azeem Ahmad, Vishesh Dubey, Veena Singh, Ankit Butola, Tonmoy Mohanty, and Sreyankar Nandi. "Longitudinal spatial coherence gated high-resolution tomography and quantitative phase microscopy of biological cells and tissues with uniform illumination." In Quantitative Phase Imaging IV, vol. 10503, pp. 8-15. SPIE, 2018. Link 

40. Mehta, D.S., Ahmad, A., Dubey, V., Singh, V., Butola, A., Mohanty, T., Nandi, S., Vasilenko, I., Vlasova, E., Metelin, V. and Kardasheva, Z., 2018. PROGRESS IN BIOMEDICAL OPTICS AND IMAGING-PROCEEDINGS OF SPIE.

41. Butola, Ankit, Rahul Pal, Azeem Ahmad, Vishesh Dubey, Veena Singh, Kedar Khare, P. Senthilkumaran, and Dalip Singh Mehta. "Fiber-Optic Micro-Endoscopy for Imaging Biological Cells at Remote Location and Depixelation of Images Using Discrete Cosine Transform." In 2017 IEEE Workshop on Recent Advances in Photonics (WRAP), pp. 1-2. IEEE, 2017. Link 

42. Singh, Veena, Gyanendra Singh, Azeem Ahmad, Vishesh Dubey, Ankit Butola, Tilak Joshi, and Dalip Singh Mehta. "Polarization interferometric digital holographic microscope for quantitative phase imaging and coherent noise reduction." In European Conference on Biomedical Optics, p. 104140V. Optica Publishing Group, 2017. Link 

43. Dubey, Vishesh, Azeem Ahmad, Veena Singh, Ankit Butola, and Dalip Singh Mehta. "Quantitative phase imaging using white light interference microscopy with color fringe analysis; A comparative study of color interferograms recorded by single chip and 3-chip CCD color camera." In European Conference on Biomedical Optics, p. 104140I. Optica Publishing Group, 2017. Link 

44. Butola, Ankit, Azeem Ahmad, Vishesh Dubey, Veena Singh, Tilak Joshi, P. Senthilkumaran, and Dalip Singh Mehta. "Quantitative phase imaging using spectrally resolved white light interferometry." In European Conference on Biomedical Optics, p. 104140G. Optica Publishing Group, 2017. Link 

45. Ahmad, Azeem, Vishesh Dubey, Veena Singh, Ankit Butola, Tilak Joshi, and Dalip Singh Mehta. "Reduction of spatial phase noise in the laser based digital holographic microscopy for the quantitative phase measurement of biological cells." In European Conference on Biomedical Optics, p. 104140H. Optica Publishing Group, 2017. Link 

46. R. Singh, D. Wolfson, V. Dubey, A. Ahmad, G. Acharya, D. Mehta, P. Basnet, and B. Ahluwalia, “Inflammatory response of macrophages and trophoblasts investigated using structured illumination microscopy and quantitative phase microscopy,” Placenta, vol. 57, p. 333, Sep. 2017. Link 

47. Habib, Anowarul, Azeem Ahmad, Sanat Wagle, Balpreet Singh Ahluwalia, Frank Melandsø, Anuj Kumar Tiwari, and Dalip Singh Mehta. "Quantitative phase measurement for the damage detection in piezoelectric crystal using angularly placed multiple inter digital transducers." In 2016 IEEE International Ultrasonics Symposium (IUS), pp. 1-4. IEEE, 2016. Link 

48. Mehta, Dalip Singh, Anuradha Sharma, Vishesh Dubey, Veena Singh, and Azeem Ahmad. "Quantitative phase imaging of biological cells and tissues using singleshot white light interference microscopy and phase subtraction method for extended range of measurement." In Quantitative Phase Imaging II, vol. 9718, pp. 257-264. SPIE, 2016. Link 

49. Singh, Veena, Vishesh Dubey, Azeem Ahmad, Gyanendra Singh, and D. S. Mehta. "A novel phase shifting structured illumination microscopy." In Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXIII, vol. 9713, pp. 239-245. SPIE, 2016. Link 

50. Dubey, Vishesh, Veena Singh, Azeem Ahmad, Gyanendra Singh, and Dalip Singh Mehta. "White light phase shifting interferometry and color fringe analysis for the detection of contaminants in water." In Quantitative Phase Imaging II, vol. 9718, pp. 199-205. SPIE, 2016. Link 

51. Berwal, Sonam, Azeem Ahmad, Vishesh Dubey, Vishal Srivastava, M. Inam, and Dalip Singh Mehta. "High-resolution white light interferometry for quantitative phase imaging of human red blood cells using three-chip colour camera." In International Conference on Fibre Optics and Photonics, pp. M4A-6. Optica Publishing Group, 2014. Link 

52. Ahmad, Azeem, Vishal Srivastava, Devjyoti Dalal, Elanchezhiyan Devarajan, Dalip Singh Mehta, and Krishna Dalal. "In vivo assessment of human burn skin using swept source optical coherence tomography." In International Conference on Fibre Optics and Photonics, pp. M4A-7. Optica Publishing Group, 2014. Link