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Nanospectroscopy Lab
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A nano-spectroscopy lab that observes the nanoscale world with visible light.
AboutAbout the lab
"Seeing" the nanoscale world with visible light
The Nanospectroscopy Lab develops cutting-edge nanoscale optical analysis techniques and applies them to elucidate nanoscale physical phenomena.
Because optical microscopes normally provide only micrometer-scale resolution, the lab combines near-field optics and plasmonics with Raman spectroscopy and photoluminescence measurement to create techniques for observing the nanoscale world with visible light.
The lab also conducts research to create new nano-optical devices and techniques by manipulating the wavelength and spatial extent of light at the nanoscale.
The lab's website also presents it under the name "Verma Lab."
Key terms
- Raman spectroscopy
- An analysis method that examines molecular vibrations from the energy of scattered light. It reveals molecular species and chemical bonds
- Near-field light
- Strongly localized light that forms at the tip of a metal probe and does not propagate far. It serves as a nano-sized light source
- Diffraction limit of light
- The limit below which light cannot be focused to a spot smaller than about half its wavelength. For visible-light microscopes, the limit is around 200-300 nm
- Plasmon nanofocusing
- A method that concentrates plasmons toward the tip of a metal probe to create strongly localized near-field light
NewsLab news
Joint research with Nagoya University observed the formation of metal nanoparticles with high-speed AFM. Published in Nanoscale
A doctoral student won an Outstanding Oral Presentation Award at the Japanese Society of Microscopy
Joint research with Chiba University and others developed a probe-scanning high-speed AFM that can be used in solvents. Published in Langmuir
A doctoral student won a Best Poster Award at the Advanced Vibrational Spectroscopy international conference
A mini-review on plasmon nanofocusing was published in Journal of Raman Spectroscopy
ResearchResearch themes
The lab develops techniques for observing nanoscale samples with visible light by combining spectroscopy such as Raman scattering with near-field optics and plasmonics. It also works on analyzing a variety of samples and on developing techniques to create a nano-sized light source at the tip of a probe.
*Illustrative imageRaman spectroscopy for measuring molecular vibrations
By measuring the energy of Raman-scattered light, the lab non-destructively identifies molecular species and chemical bonds from molecular vibrations. It also develops Raman microscopy, which images the signal distribution by scanning the focal point, as well as original spectroscopic techniques.
*Illustrative imageRaman analysis of various samples
The lab analyzes carbon nanotubes, graphene, organic semiconductor materials, and biological samples. It has also developed ultralow-frequency Raman spectroscopy for probing weak intermolecular forces (van der Waals forces), and an original cryostat chamber that enables Raman measurements at low temperatures.
*Illustrative imageTip-enhanced Raman spectroscopy (TERS) microscopy
Light is directed at the tip of a nano-sharp metal needle to create near-field light, which makes it possible to collect Raman-scattered light from nanoscale regions even with visible light. The technique achieves resolution beyond the diffraction limit of light, and the lab also works on improving its sensitivity, stability, and imaging speed.
*Illustrative imagePlasmon nanofocusing
In this method, light is directed at a coupler placed away from the probe tip, and the excited plasmons are guided to the tip to create near-field light. Because the incident light does not hit the tip, no noise arises from the incident light. The lab has established an original probe fabrication method and applies it to TERS microscopy and other uses.
MembersFaculty
The members of the Nanospectroscopy Lab are faculty, a secretary, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorPrabhat Verma
- Associate ProfessorTakayuki Umakoshi
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Optical cell rotator” Katzeimsack72 / Public domain (cropped)
- Raman spectroscopy for measuring molecular vibrations: “Raman Spectroscopy device by Bruker” Ijon / CC BY-SA 4.0 (cropped)
- Raman analysis of various samples: “Types of Carbon Nanotubes” User Mstroeck on en.wikipedia / CC BY-SA 3.0 (cropped)
- Tip-enhanced Raman spectroscopy (TERS) microscopy: “AFM-Raman-TERS system” AAMonitor96 / CC BY-SA 3.0 (cropped)
- Plasmon nanofocusing: “Propagating surface plasmon polaritons” Huilin Qing / CC BY-SA 4.0 (cropped)
- Related lab (Nano-Biophotonics Lab [Graduate School of Frontier Biosciences]): “Gold Nanoparticles” Tae Joon Cho Sherrie Elzey Vincent A. Hackley Stephen (San-Min) Lee Robert I. MacCuspie Julian Taurozzi De-Hao Tsai / Public domain (cropped)
- Related lab (Nanophotonics Lab): “InVia Raman microscope - March 2008” theterrifictc / CC BY-SA 2.0 (cropped)
- Related lab (Quantum Measurement Lab): “Unreaviling water surface” Pawel Nowakowski / CC BY-SA 4.0 (cropped)
- Related lab (Nanoelectronics Lab): “Metamaterial” Nalaf / CC BY-SA 4.0 (cropped)
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