Publications:

• "Raman spectroscopic nano-imaging of optical fields of metal nanostructures with a chemically modified metallic tip", Ryo Kato, Takayuki Umakoshi and Prabhat Verma, The Journal of Physical Chemistry C, (Published online, 2021).
  
  
• "Plasmon nanofocusing for the suppression of photodegradation in fluorescence imaging using near-field scanning optical microscopy", Ravi Yadav, Hiroshi Arata, Takayuki Umakoshi and Prabhat Verma, Optics Communications 497, 127206 (2021).
  
  
• Book Chapter: "Tip-Enhanced Raman Spectroscopy", Takayuki Umakoshi and Prabhat Verma, (Eds. D. K. Singh, M. Pradhan, and A. Materny), Modern Techniques of Spectroscopy, Vol. 13, pp 209-234. Springer, Singapore (2021).
        Download a preview of the Chapter
• "Polarization Raman Imaging of Organic Monolayer Islands for Crystal Orientation Analysis", Toki Moriyama, Takayuki Umakoshi, Yoshiaki Hattori, Koki Taguchi, Prabhat Verma and Masatoshi Kitamura, ACS Omega 6, 9520 (2021).
  
  
• "Broadband Plasmon Nanofocusing: Comprehensive Study of Broadband Nanoscale Light Source", Koki Taguchi, Takayuki Umakoshi, Shota Inoue and Prabhat Verma, J. Phys. Chem. C 125, 6378 (2021).
  
  
• "Label-free Raman mapping of saturated and unsaturated fatty acid uptake, storage, and return toward baseline levels in macrophages", Takeshi Sugiyama, Alison J. Hobro, Nicolas Pavillon, Takayuki Umakoshi, Prabhat Verma and Nicholas Smith, Analyst 146, 1268 (2021).
  
  
• "Probing stacking configurations in a few layered MoS₂ by low frequency Raman spectroscopy", Rhea Thankam Sam, Takayuki Umakoshi and Prabhat Verma, Sci. Rep. 10, 21227 (2020).
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• "Defect-related anomalous low-frequency Raman scattering in a few-layered MoS₂", Rhea Thankam Sam, Takayuki Umakoshi and Prabhat Verma, Appl. Phys. Exp. 13, 072003 (2020).
  
  
• "One-side metal-coated pyramidal cantilever tips for highly reproducible tip-enhanced raman spectroscopy", Ryo Kato, Koki Taguchi, Ravi Yadav, Takayuki Umakoshi, and Prabhat Verma, Nanotechnology 31, 335207 (2020).
  
  
• "White nanolight source for optical nanoimaging", Takayuki Umakoshi, Misaki Tanaka, Yuika Saito, Prabhat Verma, Science Advances 6, eaba4179 (2020).
  
        Also read a feature article on this paper:
        On Phy.org : "White nanolight source for optical nanoimaging"
  
  
• "Tip-Enhanced Raman Spectroscopy of Multiwalled Carbon Nanotubes through D‐Band Imaging: Implications for Nanoscale Analysis of Interwall Interactions", Ryo Kato, Shun Igarashi, Takayuki Umakoshi, and Prabhat Verma, ACS Appl. Nano Mater. 3, 6001 (2020).
  
  
• "Anharmonic Effects in Single-Walled Carbon Nanotubes Analyzed through Low-Temperature Raman Imaging", Takayuki Umakoshi, Masaki Taniguchi, and Prabhat Verma, J. Phys. Chem. C 124, 6922 (2020).
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• "Probing inter-molecular interactions of dinaphthothienothiophene (DNTT) molecules in a transistor device using low-frequency Raman spectroscopy", Bishwajeet Singh Bhardwaj, Rhea Thankam Sam, Takayuki Umakoshi, Naoko Namba, Takafumi Uemura, Tsuyoshi Sekitani, and Prabhat Verma, Appl. Phys. Exp. 13, 022010 (2020).
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• "Probing nanoscale defects and wrinkles in MoS₂ by tip-enhanced Raman spectroscopic imaging", Ryo Kato, Takayuki Umakoshi, Rhea Thankam Sam, and Prabhat Verma, Appl. Phys. Lett. 114, 073105 (2019).
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• "Orientation analysis of pentacene molecules in organic field-effect transistor devices using polarization-dependent Raman spectroscopy", Bishwajeet Singh Bhardwaj, Takeshi Sugiyama, Naoko Namba, Takayuki Umakoshi, Takafumi Uemura, Tsuyoshi Sekitani and Prabhat Verma, Sci. Rep. 9, 15149 (2019).
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• "Raman Spectroscopic Studies of Dinaphthothienothiophene (DNTT)", Bishwajeet Singh Bhardwaj, Takeshi Sugiyama, Naoko Namba, Takayuki Umakoshi, Takafumi Uemura, Tsuyoshi Sekitani and Prabhat Verma, Materials 12, 615 (2019).
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• "Tapered arrangement of metallic nanorod chains for magnified plasmonic nanoimaging", Yoshiro Ohashi, Bikas Ranjan, Yuika Saito, Takayuki Umakoshi, and Prabhat Verma, Sci. Rep. 9, 2656 (2019).
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• "Plasmonic transfer of near-field light from subwavelength objects through a gold-nanorod chain", Yoshiro Ohashi, Bikas Ranjan, Yuika Saito, Takayuki Umakoshi, and Prabhat Verma, Appl. Phys. Exp. 11, 102001 (2018).
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• "Tip-Enhanced Raman Spectroscopy: Technique and Recent Advances", Prabhat Verma, Chem. Rev. 117, 6447 (2017).
        Download pdf version of the article
• "Near-field absorption imaging by a Raman nano-light source", Ryo Kato, Yuika Saito, and Prabhat Verma, RSC Adv. 6, 113139 (2016).
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• "Control of near-field polarizations for nanoscale molecular orientational imaging", Toshihiro Mino, Yuika Saito, and Prabhat Verma, Appl. Phys. Lett. 109, 041105 (2016).
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• "Highly efficient plasmonic tip design for plasmon nanofocusing in near-field optical microscopy", Takayuki Umakoshi, Yuika Saito, and Prabhat Verma, Nanoscale 8, 5634 (2016).
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• "High-sensitivity pesticide detection using particle-enhanced resonant Raman scattering", Bikas Ranjan, Yuika Saito, and Prabhat Verma, Appl. Phys. Exp. 9, 032401 (2016).
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• "Superhydrophobic SERS Substrates Based on Silver-Coated Reduced Graphene Oxide Gratings Prepared by Two-Beam Laser Interference", Zhao-Xu Yan, Yong-Lai Zhang, Wei Wang, Xiu-Yan Fu, Hao-Bo Jiang, Yu-Qing Liu, Prabhat Verma, Satoshi Kawata, and Hong-Bo Sun, ACS Appl. Mater. Interfaces 7, 27059 (2015).
        Download pdf version of the article
• "Optical Antennas with Multiple Plasmonic Nanoparticles for Tip-Enhanced Raman Microscopy", Atsushi Taguchi, Yu Jun, Prabhat Verma and Satoshi Kawata, Nanoscale 7, 17424 (2015).
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• "Silver Hierarchical Structures Grown on Microstructured Silicon in Chip for Microfluidic Integrated Catalyst and SERS Detector", Zhaoxu Yan, Chunhao Li, Yang Luo, Jihong Zhao, Hai Yang, Prabhat Verma, and Satoshi Kawata, Chinese Optics Letters 13, 102401 (2015).
        Download pdf version of the article
• "Temperature-dependent Photodegradation in UV-resonance Raman Spectroscopy", Hikaru Yoshino, Yuika Saito, Yasuaki Kumamoto, Atushi Taguchi, Prabhat Verma, and Satoshi Kawata, Analytical Sciences 31, 451 (2015).
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• "Optical Antennas for Tunable Enhancement in Tip-Enhansed Raman Spectroscopy Imaging", Imad Maouli, Atsushi Taguchi, Yuika Saito, Satoshi Kawata, and Prabhat Verma, Appl. Phys. Exp. 8, 032401 (2015).
        Download pdf version of the article
  This paper was selected as Spotlights 2015 by IOP.
  

• "Quantitative Analysis of Polarization-Controlled Tip-Enhanced Raman Imaging Through the Evaluation of Tip Dipole", Toshihiro Mino, Yuika Saito, and Prabhat Verma, ACS Nano 8, 10187 (2014).
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• "Tip-enhanced Raman investigation of extremely localized semiconductor-to-metal transition of carbon nanotube", Yoshito Okuno, Yuika Saito, Satoshi Kawata, and Prabhat Verma, Phys. Rev. Lett. 111, 216101 (2013).
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• "Tip-enhanced nano-Raman analytical imaging of locally-induced strain distribution in carbon nanotubes", Taka-aki Yano, Taro Ichimura, Shota Kuwahara, Fekhra H'Dhili, Kazumasa Uetsuki, Yoshito Okuno, Prabhat Verma, and Satoshi Kawata, Nature Commun. 4, 2592 (2013).
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• "Far-field free tapping-mode tip-enhanced Raman microscopy", Jun Yu, Yuika Saito, Taro Ichimura, Satoshi Kawata and Prabhat Verma, Appl. Phys. Lett. 102, 123110 (2013).
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• "Evaluation of the interlayer interactions of few layers of graphene", Junto Tsurumi, Yuika Saito and Prabhat Verma, Chem. Phys. Lett. 557, 114 (2013).
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• "Molecular orientation analysis of organic thin films by z-polarization Raman microscope", Toshihiro Mino, Yuika Saito, Hiroyuki Yoshida and Prabhat Verma, J. Raman Spectrosc. 43, 2029 (2012).
        Download pdf version of the article
• "Tunable plasmon resonances in a metallic nanotip-film system", Kazumasa Uetsuki, Prabhat Verma, Peter Nordlander and Satoshi Kawata, Nanoscale 2, 5931 (2012).
        Download pdf version of the article
• "Polarization Controlled Raman Microscopy and Nanoscopy", Yuika Saito and Prabhat Verma, J. Phys. Chem. Lett., 3, 1295 (2012).
        Download pdf version of the article
• "Subnanometric stabilization of plasmon-enhanced optical microscopy", Taka-aki Yano, Taro Ichimura, Shota Kuwahara, Prabhat Verma, and Satoshi Kawata, Nanotechnology 23, 205503 (2012).
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• "Fabrication of near-field plasmonic tip by photoreduction for strong enhancement in tip-enhanced Raman spectroscopy", Takayuki Umakoshi, Taka-aki Yano, Yuika Saito, and Prabhat Verma, Appl. Phys. Exp. 5, 052001 (2012).
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• "Optimization of s-polarization Sensitivity in Apertureless Near-field Optical Microscopy", Yuika Saito, Yoshiro Ohashi and Prabhat Verma, Int. J. Optics 2012, 962317 (2012).
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• "Nano-imaging through tip-enhanced Raman spectroscopy: Stepping beyond the classical limits", Prabhat Verma, Taro Ichimura, Taka-aki Yano, Yuika Saito, and Satoshi Kawata, Laser & Photonics Rev. 4, 548 (2010).
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• "Temporally dynamic photopolymerization of C-60 molecules encapsulated in single-walled carbon nanotubes", Yuika Saito, Mitsuhiro Honda, Yoshikiyo Moriguchi and Prabhat Verma, Phys. Rev. B, 81, 245416 (2010).
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• "Experimental identification of chemical effects in surface enhanced Raman scattering of 4-aminothiophenol", Kazumasa Uetsuki, Prabhat Verma, Taka-aki Yano, Yuika Saito, Taro Ichimura and Satoshi Kawata, J. Phys. Chem. C, 114, 7515 (2010).
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• "Validity of V parameter for photonic quasi-crystal fibers", Han Zhao, Remo Proietti Zaccaria, Prabhat Verma, Junfeng Song and HongBo Sun, Opt. Lett., 35, 1064 (2010).
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• "Single-mode operation regime for 12-fold index-guiding quasicrystal optical fibers", Han Zhao, Remo Proietti Zaccaria, Prabhat Verma, Junfeng Song and HongBo Sun, Appl. Phys. B, 100, 499 (2010).
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• "Nano-scale Analysis of Graphene Layers by Tip-enhanced Near-field Raman Spectroscopy", Yuika Saito, Prabhat Verma, Kyoko Masui, Yasushi Inouye and Satoshi Kawata, J. Raman Spectrosc., 40, 1434 (2009).
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• "Pressure-assisted tip-enhanced Raman imaging at the resolution of a few nanometres", Takaaki Yano, Prabhat Verma, Yuika Saito, Taro Ichimura and Satoshi Kawata, Nature Photonics, 3, 473 (2009).
        Download pdf version of the article
  Also read news article on this paper:
        On Nature Asia Materials : "Optical imaging: Pressured resolution"
  
  
• "Plasmonics for near-field nano-imaging and super lensing", Satoshi Kawata, Yasushi Inouye and Prabhat Verma, Nature Photonics, 3, 388 (2009).
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• "Sub-nanometric near-field Raman investigation in the vicinity of a metallic nanostructure", Taro Ichimura, Shintaro Fujii, Prabhat Verma, Takaaki Yano, Yasushi Inouye and Satoshi Kawata, Phys. Rev. Lett., 102, 186101 (2009).
        Download pdf version of the article
• "Imaging and Spectroscopy through Plasmonic Nano-Probe", Yuika Saito and Prabhat Verma, Eur. Phys. J. Appl. Phys., 46, 20101 (2009).
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• "Halide-ion-assisted Increase of Surface-enhanced Hyper-Raman Scattering: A Clear Observation of the Chemical Effect", Almar Palonpon, Taro Ichimura, Prabhat Verma, Yasushi Inouye, and Satoshi Kawata, J. Raman Spectrosc., 40, 119 (2009).
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• "Manipulating full photonic band gaps in two dimensional birefringent photonic crystals", Remo Zaccaria, Prabhat Verma, Satoshi Kawaguchi, Satoru Shoji and Satoshi Kawata Optics Express, 16, 14812 (2008).
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• "Direct Evidence of Chemical Contribution to Surface-enhanced Hyper-Raman Scattering", Almar Palonpon, Taro Ichimura, Prabhat Verma, Yasushi Inouye, and Satoshi Kawata Appl. Phys. Express, 1, 092401 (2008).
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• "Oxygen-assisted shape control in polyol synthesis of silver nanocrystals", Atsushi Taguchi, Shintaro Fujii, Taro Ichimura, Prabhat Verma, Yasushi Inouye, Satoshi Kawata, Chem. Phys. Lett., 462, 92 (2008).
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• "Subwavelength colour imaging with metallic nanolens", Satoshi Kawata, Atsushi Ono, and Prabhat Verma, Nature Photonics, 2, 438 (2008).
        Download pdf version of the article
  Also read some news articles on this paper:
        On Nature Photonics News & Views : "Plasmonics: Subwavelength imaging in colour"
                           Download pdf version of this news article here!
        On Nano Werk : "Nanolens makes color imaging of nano objects possible"
        On Nature Asia Materials : "Metallic nanolens: Cure for color blindness"
        On Frost & Sullivan : "Metallic Nanolens for Nanoobject Color Imaging"
  
  
• "Active Control of the Oxidization of a Silicon Cantilever for the Characterization of Silicon-based Semiconductors", Atsushi Ono, Kyoko Masui, Yuika Saito, Takao Sakata, Atsushi Taguchi, Masashi Motohashi, Taro Ichimura, Hidekazu Ishitobi, Alvarado Tarun, Norihiko Hayazawa, Prabhat Verma, Yasushi Inouye, and Satoshi Kawata,, Chem. Lett., 37, 122 (2008).
        Download pdf version of the article
  

• "Confinement of enhanced field investigated by tip-sample gap regulation in tapping-mode tip-enhanced Raman microscopy", Taka-aki Yano, Taro Ichimura, Atsushi Taguchi, Norihiko Hayazawa, Prabhat Verma, Yasushi Inouye, and Satoshi Kawata, Appl. Phys. Lett., 91, 121101 (2007).
  * This paper also appeared in Virtual Journal of Nanoscale Science & Technology.
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• "Temporal fluctuation of tip-enhanced Raman spectra of adenine molecules", Taro Ichimura, Hiroyuki Watanabe, Yasuhiro Morita, Prabhat Verma, Satoshi Kawata, and Yasushi Inouye, J. Phys. Chem. C, 111, 9460 (2007).
        Download pdf version of the article
• "Visualization of localized strain of crystalline in nano-scale by tip-enhanced Raman spectroscope & microscope", Norihiko Hayazawa, Masashi Motohashi, Yuika Saito, Hidekazu Ishitobi, Atsushi Ono, Taro Ichimura, Prabhat Verma, and Satoshi Kawata, J. Raman Spectrosc., 38, 684 (2007).
        Download pdf version of the article
• "Nano-analysis of crystalline properties of GaN thin-film using tip-enhanced Raman spectroscopy", Ryota Matsui, Prabhat Verma, Taro Ichimura, Yasushi Inouye, and Satoshi Kawata, Appl. Phys. Lett., 90, 061906 (2007).
  * This paper also appeared in Virtual Journal of Nanoscale Science & Technology.
        Download pdf version of the article
  
• "Diameter-selective near-field Raman analysis and imaging of isolated carbon nanotube bundles", Taka-aki Yano, Prabhat Verma, Satoshi Kawata, and Yasushi Inouye, Appl. Phys. Lett., 88, 093125 (2006).
  * This paper also appeared in Virtual Journal of Nanoscale Science & Technology.
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• "Near-field Raman scattering investigation of tip effects on C60 molecules", Prabhat Verma, Kohei Yamada, Hiroyuki Watanabe, Yasushi Inouye, and Satoshi Kawata, Phys. Rev. B, 73, 045416 (2006).
  * This paper also appeared in Virtual Journal of Nanoscale Science & Technology.
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• "Optical nano-imaging of materials: Peeping through tip-enhanced Raman scattering", Satoshi Kawata and Prabhat Verma, Chimia, 60, 770 (2006).
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• "Study on polycrystallization in bulk InxGa1-xAs using micro-Raman and photoluminescence", Md. Rafiqul Islam, Prabhat Verma, Masayoshi Yamada, J. Crystal Growth, 263, 125 (2004).
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• "Modeling of strain induced by compositional variation in wafer-shaped bulk mixed crystals", Md. Rafiqul Islam, Prabhat Verma, Akira Hiroki and Masayoshi Yamada, Jp. J. Appl. Phys., 43, 5469 (2004).
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• "Raman scattering from wurtzite GaN bulk crystal", Prabhat Verma and Masayoshi Yamada, Materials Science Forum, 389, 1501 (2002).
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• "Micro-Raman characterization of starting material for traveling liquidus zone growth method", Md. Rafiqul Islam, Prabhat Verma, Masayoshi Yamada, Masami Tatsumi and Kyoichi Kinoshita, Jp. J. Appl. Phys., 41, 991 (2002).
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• "The influence of residual strain on Raman scattering in InxGa1-xAs single crystal", Md. Rafiqul Islam, Prabhat Verma, Masayoshi Yamada, S. Kodama, Y. Hanaue, and Kyoichi Kinoshita, Mat. Sc. and Engg. B, 91-92, 66 (2002).
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• "Strain-induced MI Transition in n-Si and n-Ge: Physical Mechanisms and Transport Phenomena", S. I. Budzulyak, A. E. Gorin, V. M. Ermakov, V. V. Kolomoets, E. F. Venger, Prabhat Verma, M. Yamada, E. Liarokapis and D. P. Tunstall, Phys. Status Sol. (b) 223, 519 (2001).
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• "Raman studies on new materials GaAs_1-xBi_x and InAs_1-xBi_x", Prabhat Verma, K. Oe, M. Yamada, H. Harima, M. Herms, and G. Irmer, J. Appl. Phys., 89, 1657 (2001).
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• "Confinement Effects in Electronic and Vibrational Properties of CdS_0.65Se_0.35 Nanoparticles Grown by Thermal Annealing", Prabhat Verma, Lalita Gupta, S. C. Abbi, and K. P. Jain, J. Appl. Phys., 88, 4109 (2000).
  * This paper also appeared in Virtual Journal of Nanoscale Science & Technology.
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• "Size Analysis of Nanocrystals in Semiconductor Doped Silicate Glasses with Anomalous Small-angle X-ray Scattering and Raman Scattering", G. Irmer, J. Monecke, Prabhat Verma, G. Goerigk, and M. Herms, J. Appl. Phys., 88, 1873 (2000).
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• "Laser Power Dependence of the Photoluminescence from CdS_xSe_1-x Nanoparticles in Glass", Prabhat Verma, G. Irmer, and J. Monecke, J. Phys.:Condens. Matter, 12, 1097 (2000).
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• "Phonon Sidebands of Electronic Transitions in Li-doped CdS", Prabhat Verma, J. Kortus, J. Monecke, S. Anand, and K. P. Jain, Phys. Rev. B 59, 15748 (1999).
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• "Acoustic vibration of Semiconductor Nanocrystals in Doped Glasses", Prabhat Verma, W. Cordts, G. Irmer, and J. Monecke, Phys. Rev. B 60, 5778 (1999).
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• "Excitonic Effects in Resonant Raman Scattering by 2LO-Phonon in CdS and ZnSe", Prabhat Verma, S. Anand, and K. P. Jain, Physica B 271, 1 (1999).
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• "Effective Mass and Bandstructure of n-InAs from Magnetophonon Resonance and Raman Scattering at Temperatures between 64 K and 340 K", D. Schneider, C. Brink, G. Irmer, and Prabhat Verma, Physica B, 256-258, 625 (1998).
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• "Temperature Dependent Photoluminescence Studies of ZnSe:I Single Crystals Grown by Chemical Vapor Transport", S. Anand, Prabhat Verma, S. C. Abbi, K. P. Jain, M. Tafreshi, K. Balakrishnan, and R. Dhaneskaran, Pramana-J. Phys., 47, 133 (1996).
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• "Temperature Dependence of Optical Phonon Lifetimes in ZnSe", S. Anand, Prabhat Verma, K. P. Jain, and S. C. Abbi, Physica B 226, 331, (1996).
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• "Raman Scattering Probe of Ion-implanted and Pulse Laser Annealed GaAs", Prabhat Verma, K. P. Jain, and S. C. Abbi, J. Appl. Phys. 79, 3921 (1996).
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• "Raman Scattering Probe of Anharmonic Effects in GaAs", Prabhat Verma, S. C. Abbi, and K. P. Jain, Phys. Rev. B 51, 16660 (1995).
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