* . *
  • About
  • Advertise
  • Privacy & Policy
  • Contact
Thursday, June 26, 2025
Earth-News
  • Home
  • Business
  • Entertainment
    George Lopez is coming to Spokane – KXLY.com

    George Lopez is coming to Spokane – KXLY.com

    Netflix unveils Dallas immersive venue for fans of hit shows like ‘Squid Game,’ ‘Stranger Things’ – Houston Chronicle

    Step Inside Netflix’s New Dallas Immersive Experience Featuring Hits Like ‘Squid Game’ and ‘Stranger Things

    ‘Puttin’ on the Ritz’: Civic Players bring ‘Young Frankenstein’ to life – Yahoo

    Civic Players Deliver a Hilarious and Unforgettable Performance of ‘Young Frankenstein

    ‘Wheel of Fortune’: Amputee Wins $60,000 After Breaking Incredible ‘Curse’ – Hastings Tribune

    Wheel of Fortune’ Amputee Breaks Incredible ‘Curse’ to Win $60,000!

    North Star Sports & Entertainment Network: Coming soon – KTTC News

    North Star Sports & Entertainment Network: Coming soon – KTTC News

    Safety concerns in Deep Ellum create apprehension as the entertainment district gains visitors – CBS News

    Safety Concerns Surge Amid Deep Ellum’s Booming Popularity and Growing Crowds

  • General
  • Health
  • News

    Cracking the Code: Why China’s Economic Challenges Aren’t Shaking Markets, Unlike America’s” – Bloomberg

    Trump’s Narrow Window to Spread the Truth About Harris

    Trump’s Narrow Window to Spread the Truth About Harris

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Trending Tags

    • Trump Inauguration
    • United Stated
    • White House
    • Market Stories
    • Election Results
  • Science
  • Sports
  • Technology
    Frontdoor Announces Tech Expert Dr. Bala Ganesh as Chief Technology Officer – Business Wire

    Frontdoor Appoints Tech Visionary Dr. Bala Ganesh as New Chief Technology Officer

    Defense technology giant Northrop Grumman to host interviews in Iuka to fill technician roles – supertalk.fm

    Defense technology giant Northrop Grumman to host interviews in Iuka to fill technician roles – supertalk.fm

    China’s Military Introduces Mosquito-Sized Drones: A Game-Changing Surveillance Technology – Indian Defence Review

    China Unveils Mosquito-Sized Drones: Revolutionizing Surveillance Technology

    Marvell Technology Stock Rallies After AI Event Sparks Investor Optimism – Yahoo Finance

    Marvell Technology Stock Rallies After AI Event Sparks Investor Optimism – Yahoo Finance

    Promising Technology Stocks To Follow Today – June 22nd – MarketBeat

    Top Technology Stocks to Watch Today – June 22nd

    Technology Convergence Report 2025 – The World Economic Forum

    Technology Convergence Report 2025 – The World Economic Forum

    Trending Tags

    • Nintendo Switch
    • CES 2017
    • Playstation 4 Pro
    • Mark Zuckerberg
No Result
View All Result
  • Home
  • Business
  • Entertainment
    George Lopez is coming to Spokane – KXLY.com

    George Lopez is coming to Spokane – KXLY.com

    Netflix unveils Dallas immersive venue for fans of hit shows like ‘Squid Game,’ ‘Stranger Things’ – Houston Chronicle

    Step Inside Netflix’s New Dallas Immersive Experience Featuring Hits Like ‘Squid Game’ and ‘Stranger Things

    ‘Puttin’ on the Ritz’: Civic Players bring ‘Young Frankenstein’ to life – Yahoo

    Civic Players Deliver a Hilarious and Unforgettable Performance of ‘Young Frankenstein

    ‘Wheel of Fortune’: Amputee Wins $60,000 After Breaking Incredible ‘Curse’ – Hastings Tribune

    Wheel of Fortune’ Amputee Breaks Incredible ‘Curse’ to Win $60,000!

    North Star Sports & Entertainment Network: Coming soon – KTTC News

    North Star Sports & Entertainment Network: Coming soon – KTTC News

    Safety concerns in Deep Ellum create apprehension as the entertainment district gains visitors – CBS News

    Safety Concerns Surge Amid Deep Ellum’s Booming Popularity and Growing Crowds

  • General
  • Health
  • News

    Cracking the Code: Why China’s Economic Challenges Aren’t Shaking Markets, Unlike America’s” – Bloomberg

    Trump’s Narrow Window to Spread the Truth About Harris

    Trump’s Narrow Window to Spread the Truth About Harris

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    Israel-Gaza war live updates: Hamas leader Ismail Haniyeh assassinated in Iran, group says

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    PAP Boss to Niger Delta Youths, Stay Away from the Protest

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Court Restricts Protests In Lagos To Freedom, Peace Park

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Fans React to Jazz Jennings’ Inspiring Weight Loss Journey

    Trending Tags

    • Trump Inauguration
    • United Stated
    • White House
    • Market Stories
    • Election Results
  • Science
  • Sports
  • Technology
    Frontdoor Announces Tech Expert Dr. Bala Ganesh as Chief Technology Officer – Business Wire

    Frontdoor Appoints Tech Visionary Dr. Bala Ganesh as New Chief Technology Officer

    Defense technology giant Northrop Grumman to host interviews in Iuka to fill technician roles – supertalk.fm

    Defense technology giant Northrop Grumman to host interviews in Iuka to fill technician roles – supertalk.fm

    China’s Military Introduces Mosquito-Sized Drones: A Game-Changing Surveillance Technology – Indian Defence Review

    China Unveils Mosquito-Sized Drones: Revolutionizing Surveillance Technology

    Marvell Technology Stock Rallies After AI Event Sparks Investor Optimism – Yahoo Finance

    Marvell Technology Stock Rallies After AI Event Sparks Investor Optimism – Yahoo Finance

    Promising Technology Stocks To Follow Today – June 22nd – MarketBeat

    Top Technology Stocks to Watch Today – June 22nd

    Technology Convergence Report 2025 – The World Economic Forum

    Technology Convergence Report 2025 – The World Economic Forum

    Trending Tags

    • Nintendo Switch
    • CES 2017
    • Playstation 4 Pro
    • Mark Zuckerberg
No Result
View All Result
Earth-News
No Result
View All Result
Home Science

GaN-VCSELs Hit New Milestones: Japanese Researchers Achieve Unprecedented Resonance Control

May 28, 2024
in Science
GaN-VCSELs Hit New Milestones: Japanese Researchers Achieve Unprecedented Resonance Control
Share on FacebookShare on Twitter

Gallium Nitride Purple Surface Emitting Laser

The gallium nitride purple surface-emitting laser with a power conversion efficiency of more than 20%. Credit: Tetsuya Takeuchi / Meijo University

Researchers have created a new technique for precise control of cavity length in GaN-based vertical-cavity surface-emitting lasers.

Gallium nitride (GaN) vertical-cavity surface-emitting lasers (VCSELs) are semiconductor laser diodes with promising applications in various fields, including adaptive headlights, retinal scanning displays, point-of-care testing systems, and high-speed visible light communication systems. Their high efficiency and low manufacturing costs make them especially appealing for these applications.

GaN-VCSELs are composed of two layers of special semiconductor mirrors, called distributed Bragg reflectors (DBRs), separated by active GaN-semiconductor layers, which form the optical resonant cavity, where laser light is generated. The length of this resonant cavity is crucial for controlling the target laser wavelength, called the resonance wavelength.

Development of GaN-VCSEL Structures

Thus far, two types of GaN-based VCSEL structures have been developed: one with a bottom dielectric DBR and the other with bottom aluminum indium nitride (AlInN)/GaN DBR. Both of them result in VSCELs with over 20 milliwatts of light output power and an over 10% wall plug efficiency (WPE). However, the AlInN/GaN DBR has a narrow stop wavelength bandwidth, which allows light only within a narrow wavelength range to be emitted from the VCSELs.

Moreover, the traditional cavity length control method, which involves pre-experiments with test cavity layers for the determination of their growth rate, results in an error between the estimated and final thickness of the VCSEL cavity. This error could lead to resonance wavelengths being out of the narrow stop bandwidth of the AlInN/GaN DBR, significantly affecting performance.

Innovations in Cavity Length Control

To address this issue, in a recent study, researchers from Japan, led by Professor Tetsuya Takeuchi from the Department of Materials Science and Engineering at Meijo University, developed a new in situ cavity length control method for a GaN-based VCSEL optical cavity. By precisely controlling the growth of GaN layers using in situ reflectivity spectra measurements, the researchers achieved precise cavity length control with only a 0.5% deviation from the target resonance wavelength. Now, they have further expanded this innovative technique and demonstrated cavity length control of a complete VSCEL.

Prof. Takeuchi explains, “The cavity of a VCSEL contains not only GaN layers but also an indium tin oxide (ITO) electrode and a niobium pentoxide (Nb2O5­) spacer layer, which cannot be controlled with the same in situ reflectivity spectra measurement system. In this study, we developed a technique to precisely calibrate the thickness of these additional layers, resulting in highly efficient VCSELs.” Their study was published in Volume 124, Issue 13 of the journal Applied Physics Letters.

Calibration Techniques for Additional Layers

To calibrate the thickness of the additional layers, the researchers first deposited the ITO electrodes and Nb2O5 spacer layers with varying thicknesses on the GaN test structures that were grown using the in situ cavity control. Given that the in situ reflectivity measurement cannot be used for these additional layers, they directly evaluated the resonance wavelength of these test cavity structures using ex situ reflectivity spectra measurement. The obtained resonance wavelengths were redshifted, meaning the wavelengths were increased with an increase in the thickness of ITO and Nb2O5­ layers.

Next, the researchers mapped the resonance wavelength shifts as a function of the ITO and Nb2O5­ layer thicknesses, obtaining accurate information about their optical thicknesses. They used this information to precisely calibrate the thickness of the ITO and Nb2O5­ layers towards the target VCSEL resonance wavelength. The deviation of resonance wavelength control resulting from this method was sufficiently low, within 3%, comparable to the in situ control method in terms of optical thickness.

Finally, the researchers fabricated GaN-VCSELs with aperture sizes ranging from 5 to 20 µm by implementing the tuned ITO electrodes and Nb2O5­ spacer layers into the VCSEL cavity grown using the in situ cavity control. The peak emission wavelength of these VCSELs had a deviation of merely 0.1% from the designed resonance wavelength. Notably, thanks to the precise cavity length control, the 5-µm aperture VCSEL achieved a WPE of 21.1%, marking a significant achievement.

“Just like a highly accurate scale enables the construction of detailed shelves, the precise use of in situ thickness control of GaN layers combined with thickness calibration of ITO electrodes and Nb2O5 spacer layers enables highly controlled fabrication of VCSELs, representing a powerful tool for obtaining high-performance and highly reproducible GaN-based VCSELs for highly efficient optoelectronic devices,” concludes Prof. Takeuchi, highlighting the importance of these findings.

Reference: “Over 20% wall plug efficiency of on-wafer GaN-based vertical-cavity surface-emitting laser” by Ruka Watanabe, Kenta Kobayashi, Mitsuki Yanagawa, Tetsuya Takeuchi, Satoshi Kamiyama, Motoaki Iwaya and Toshihiro Kamei, 28 March 2024, Applied Physics Letters.
DOI: 10.1063/5.0200294

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/gan-vcsels-hit-new-milestones-japanese-researchers-achieve-unprecedented-resonance-control/

Tags: GaN-VCSELsmilestonesscience
Previous Post

Simple Equation Predicts the Shapes of Carbon-Capturing Wetlands

Next Post

The Frequencies of Cognition: Exploring How Our Brains Differentiate Sounds

HUD to move into the National Science Foundation headquarters, no current plan on where to relocate NSF employees – Government Executive

HUD to move into the National Science Foundation headquarters, no current plan on where to relocate NSF employees – Government Executive

June 25, 2025

Protecting the Boundless Future of U.S. Science: Tackling Tomorrow’s Challenges Today

June 25, 2025
LVMH’s Paris Olympics partnership wins Luxury and Lifestyle Grand Prix – Ad Age

LVMH Shines Bright with Luxury and Lifestyle Victory at Paris Olympics Partnership

June 25, 2025
Why the Strait of Hormuz, A Vital Oil Route, Is Vulnerable to Israel-Iran Conflict – The New York Times

Why the Strait of Hormuz, A Vital Oil Route, Is Vulnerable to Israel-Iran Conflict – The New York Times

June 25, 2025
Dying honey bees are threatening California’s economy. Can Central Valley lawmakers save them? – CalMatters

Dying honey bees are threatening California’s economy. Can Central Valley lawmakers save them? – CalMatters

June 25, 2025
Butler launches sports, entertainment institute focused on local events – Inside INdiana Business

Butler Launches Exciting New Sports and Entertainment Institute Spotlighting Local Events

June 25, 2025
Expert panel picked by RFK Jr. will scrutinize the vaccine schedule for kids – NPR

Expert panel picked by RFK Jr. will scrutinize the vaccine schedule for kids – NPR

June 25, 2025
What Is a Democratic Socialist? – The New York Times

What Is a Democratic Socialist? – The New York Times

June 25, 2025
Frontdoor Announces Tech Expert Dr. Bala Ganesh as Chief Technology Officer – Business Wire

Frontdoor Appoints Tech Visionary Dr. Bala Ganesh as New Chief Technology Officer

June 25, 2025
City council approves Sports Illustrated Resort – WBRC 6 News

City Council Approves Exciting New Sports Illustrated Resort Project

June 25, 2025

Categories

Archives

June 2025
MTWTFSS
 1
2345678
9101112131415
16171819202122
23242526272829
30 
« May    
Earth-News.info

The Earth News is an independent English-language daily published Website from all around the World News

Browse by Category

  • Business (20,132)
  • Ecology (698)
  • Economy (717)
  • Entertainment (21,612)
  • General (15,564)
  • Health (9,756)
  • Lifestyle (722)
  • News (22,149)
  • People (719)
  • Politics (724)
  • Science (15,935)
  • Sports (21,213)
  • Technology (15,702)
  • World (697)

Recent News

HUD to move into the National Science Foundation headquarters, no current plan on where to relocate NSF employees – Government Executive

HUD to move into the National Science Foundation headquarters, no current plan on where to relocate NSF employees – Government Executive

June 25, 2025

Protecting the Boundless Future of U.S. Science: Tackling Tomorrow’s Challenges Today

June 25, 2025
  • About
  • Advertise
  • Privacy & Policy
  • Contact

© 2023 earth-news.info

No Result
View All Result

© 2023 earth-news.info

No Result
View All Result

© 2023 earth-news.info

Go to mobile version