There are many articles about wavelengths of infra red rays used. There are many articles about wavelengths of radio waves used. There are many websites about spectrum of electromagnetic waves. But, I could not find any article which mentions about maximum possible wavelengths of light rays (including infra red rays) constructed or used, and I could not find any article which mentions about minimum possible wavelengths of radio waves (including micro wave) constructed or used. I do not need theoritical articles. I do not need theoritical possibilities. More specifically, I like to know whether any light ray with wavelength 1.5 mm (>1.1 mm) has been constructed, and to know whether any radio wave wavelength 1.5 mm (
Radio waves are light waves. Radio waves with wavelength of 100s of kilometers have been created. X-rays and gamma rays are light waves with very short wavelength. 3 m wavelength is used for VHF communication. 1.5 mm is 200 GHz and there is a lot of work around that frequency.
https://www.nrao.edu/meetings/isstt/papers/2020/2020000067.pdf
Malcolm White
Thanks professor for your reference. I downloaded the article. For me, light rays are not radio waves. I shall wait for experimental construction evidence of light rays with wavelength about 1.5 mm.
Aparna Sathya Murthy
Thanks professor for your information. I could not find these details in websites regarding optical communcations. The website address provided by Prof. Malcolm White gives many articles about wavelengths of infrared rays than radio waves. But, I am still searching for a constructed or used infra red ray with wavelength about 1.5 mm. Thanks again.
Aparna Sathya Murthy
Thanks professor for your references. The maximum wavelength for IR rays that I could find from the references is 25000 nm=0.025 mm. So, I shall wait. Thanks again.
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